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I

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You

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All right, Jamie, you ready?

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For what?

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I'm going to paint you a word picture.

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Okay, let me get in my space.

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Go.

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Okay, it's Sunday morning.

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The grass is high.

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It's time to mow the lawn.

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So you pull the lawnmower out of the garage.

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You start it up and you start pushing around your lawn.

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That's spelling cut grass coming up through your nose.

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It's great.

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So you're almost done.

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You're close to the driveway where

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there's some rocks on the lawn and your lawnmower

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goes over one of those rocks, kicks it across the street,

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kills somebody.

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Kill somebody.

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But it doesn't actually have to kill somebody.

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The idea is that a rock kick by a lawnmower

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can have an equivalent amount of force as a bullet

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delivered from a .357 pistol.

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Leafle lawnmowers.

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I like it.

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What else we got?

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Well, continuing in the theme of accidental ammo,

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we have a construction site myth called Glass Geotine.

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Goes a little like this.

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Paint a glass in a building.

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Guy walking down the street.

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Paint a glass comes loose.

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Shing.

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Well, that sounds like a pain in the glass.

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Exactly.

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If we're going to be testing whether a rock effectively

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becomes a bullet when it gets hit by a lawnmower blade,

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we need to be someplace like this.

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We've actually been filming in this very location

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for 10 years.

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Down there is the range in which Jamie and I first

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got trained to fire sniper rifles.

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And this is where we made hands out of chicken parts high five

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and cut them to ribbons with the off-guessing

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from a magnum revolver.

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Today, we are using one of their more remote ranges.

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All right, here we go.

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Remote because in an episode devoted to accidental ammo.

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What are we doing with all this plywood?

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You'll find out.

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The mythbusters are bringing some ballistic bedrock

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to their soon-to-be-made backyard.

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What if one sheet of plywood's the other?

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We're screwed.

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Yes, we could do this test on a real lawn.

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But remember, this isn't about whether lawn mowers cut grass.

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We know this.

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This is about what happens to rocks

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when they interact with lawn mowers.

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I walked in my own path.

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So we've created our lawn laboratory here

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in order to remove variables and to clearly see what

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happens to those rocks.

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Our experimental design today is pretty straightforward.

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We are going to lay down these rocks.

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Now it's starting to sink into me what we're about to do.

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Turn on this gas-powered motor and run it over them.

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What we want to witness is what happens in the reaction

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between the stones and the blade of the lawn mower.

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This is going to be a horror show.

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Our blue figures are painted onto styrofoam.

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And so if any rocks come out of the mower with any force,

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this foam is soft enough that it should easily show it.

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The mowers when James was a kid didn't even have wheels.

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They had a really interesting name.

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They were called, what was it?

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Oh, goats.

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Ah!

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OK, let's see if this thing starts up.

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Modern metal mowers have debris deflection more than covered

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with this spring-loaded safety flap.

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Nothing came out.

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We got to pull that door.

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But Adam and Jamie want to know what

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happens in the worst case scenario.

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Seems like the safety features work beautifully.

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But as you know on Mythbusters, that's never stopped us.

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The first order of business, remove this little door

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with a word danger on it.

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There we go.

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Safety feature removed.

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With the mower now poorly maintained,

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the opening on the right-hand side

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means any debris propelled by the blades

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will hit the styrofoam targets.

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Adam, standing behind the mower, should be safe.

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What's going to happen?

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Free!

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Well, one thing's for certain.

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Two!

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Unless you're wearing hockey armor.

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One!

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You don't want to stand in front of the opening to that mower.

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I don't want to do this anymore.

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This is terrifying.

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I start out.

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I start the mower.

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And I get into a rhythm.

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It's the most terrifying rhythm I've ever been in.

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I actually ended up turning my entire body away

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from this rain, this shower, this firestorm

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of little tiny bubbles.

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One even flew up in the air and landed on my hat.

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And I can't even picture the physics required

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for that to occur.

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Good lord!

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I ran out of steam, and that is fine with me.

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Here, I'm no expert with cameras, but that's bad.

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Am I right?

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That's bad.

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I don't ever want to be behind a mower doing that again.

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While Adam was behind the mower out of the line of fire.

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I'm really sorry about that.

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I apologize here.

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I'll put that right there.

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A veritable firestorm of stones and ricochets

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meant no one was safe.

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Come here.

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Oh my gosh.

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Hit, hit, hit.

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With the foam on Looker's pepper.

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That went all the way through.

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Wow.

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The myth that a lawn mower can fling rocks

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at bullet-like force is clearly on the right track.

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It threw this.

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This, that's heavy with enough force

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to embed itself in this.

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I mean, I know that it's foam, but this is, I'm amazed.

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So there's evidence the ballistic fallout is significant,

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but the Heinemann can't resist ramping it up.

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This thing here is what you call a premium domestic lawn mower.

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It's a ride on and it's made to mow lawns fast.

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It's fun.

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That's beautiful.

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Ha, ha, ha, ha.

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With an engine four times more powerful.

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Jamie, are you ready?

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I'm ready.

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How much more havoc will Jamie wreak?

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Three, two, one, go.

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Oh, no.

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Oh, no.

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I brought in the riding lawn mower

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and picked up where Adam left off.

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Oh, oh, my God.

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Stop, stop.

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As you can see, there are no rocks left where I mow.

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That mower moved them successfully off to the side

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with vigor.

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Ha, ha, ha.

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How'd I do?

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Um...

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You know, I don't really care.

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You might want to think twice before inviting a nuthbuster

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to mow your lawn.

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I'm just saying.

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I think we have had fun so far.

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But it is important to remember that this entire story

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is about the interaction between a spinning lawn mower blade

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and a rock.

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How fast does it leave and with how much energy?

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Now, were those rocks leaving the lawn mower

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at the speed of a bullet

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or with the same amount of energy?

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That we don't yet know.

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I think what we've got to do is take some of this equipment

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back into the shop, remove even more variables,

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and hone in to find out

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if they really are kicking those rocks

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with the energy of a three, five, two, seven.

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More mayhem is set to continue.

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Everybody okay?

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But coming up next...

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The accidental ammo armor-geddon...

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Two, one...

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...hits dangerous new heights.

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Baaah!

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MUSIC

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BAM!

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I did not expect that level of carnage from our lawn mower.

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Yeah, we might be onto something with that.

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True, but a lot is going to rest on exactly how fast

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those rocks are actually going.

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But before we get to that,

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what's it, we crank up the gore on another story?

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You're talking about glass guillotine.

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Yes, the myth is that if a pane of glass

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falls out of an office building

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and you're unlucky enough for it to find you in the street,

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it will shing!

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Cleave you right in twain.

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Well, I don't know about that, but whatever happens,

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it ain't going to be pretty.

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No.

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MUSIC

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For us to do our glass guillotine experiment,

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we need something to cut.

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Something that ideally would be like a human.

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And, well, I asked for some volunteers from the shop crew,

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but nobody stepped up.

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So I'm going to have to make my own,

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and to do that, I'm going to melt down a clear,

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flesh-like material

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and pour it into this human-sized torso mold.

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Yep, for anatomical accuracy.

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MUSIC

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Jamie's using a creepy mix of realistic materials.

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See the way that tears?

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It's like a real thing.

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It's like a real thing.

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It's like a real thing.

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See the way that tears?

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This is a polyethylene material,

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and it actually rips.

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Just like flesh will rip.

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So I'm going to use this as a filler material

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so that when our plastic dummy gets impacted,

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it actually cleaves

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if it's going to, like, flesh.

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MUSIC

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Getting a human-like texture

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for their torso is critical.

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There we go.

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Adding bags of blood?

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Not so much.

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These bags are made for what's known as sous vide.

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It's a method of cooking,

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and it means that the plastic's able

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to withstand a fair amount of heat,

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and this will provide a container for the blood,

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which, when we float this

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or hang it inside our mold,

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hopefully, if it gets hit with our

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class guillotine, it'll bleed.

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MUSIC

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With the gratuitously gory innards placed,

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the pouring of the now super-heated gel

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commences.

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The plastic is now ready to be used

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when the super-heated gel commences.

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MUSIC

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It's funny to go back through

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our whole entire history

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of human-analog production.

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There we go.

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We started off so primitively,

259
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just filling molds like this with dessert gelatin.

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All the way up to, you know, last year,

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we made a human analog

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that would actually get hypothermia

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while you watch.

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It's all looking good. It's nice and clear.

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In this case, for our glass guillotine,

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this one bleeds.

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And in 12 hours when it cools,

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we're going to try it out.

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It's a beautiful start.

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Oh, it's beautiful.

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But their bubble is soon burst.

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That right there, that's a breach

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of one of our blood bags inside

274
00:13:07,440 --> 00:13:09,440
our human analog here.

275
00:13:09,440 --> 00:13:11,440
It doesn't look like they've all breached,

276
00:13:11,440 --> 00:13:13,440
but if one has, well,

277
00:13:13,440 --> 00:13:15,440
there's only one of two reasons,

278
00:13:15,440 --> 00:13:17,440
either because the bag was improperly constructed

279
00:13:17,440 --> 00:13:19,440
or because they're all going to breach.

280
00:13:19,440 --> 00:13:21,440
And that's the end of the story.

281
00:13:21,440 --> 00:13:23,440
So, we're going to go back to the

282
00:13:23,440 --> 00:13:25,440
final product.

283
00:13:25,440 --> 00:13:27,440
I have no idea.

284
00:13:27,440 --> 00:13:29,440
We just got to wait till this cools

285
00:13:29,440 --> 00:13:31,440
and see what we get.

286
00:13:31,440 --> 00:13:33,440
This is how

287
00:13:33,440 --> 00:13:35,440
Jamie was born.

288
00:13:35,440 --> 00:13:37,440
Ta-da!

289
00:13:37,440 --> 00:13:39,440
Hey!

290
00:13:39,440 --> 00:13:41,440
Oh, he looks a lot better

291
00:13:41,440 --> 00:13:43,440
than I was afraid he'd look.

292
00:13:43,440 --> 00:13:45,440
Yeah.

293
00:13:45,440 --> 00:13:47,440
Wow.

294
00:13:47,440 --> 00:13:49,440
This looks pretty usable.

295
00:13:49,440 --> 00:13:51,440
Nice!

296
00:13:51,440 --> 00:13:53,440
This is the first of our castings,

297
00:13:53,440 --> 00:13:55,440
and frankly, we were worried that we had ruined it.

298
00:13:55,440 --> 00:13:57,440
But while it's not perfect,

299
00:13:57,440 --> 00:13:59,440
hey, sorry,

300
00:13:59,440 --> 00:14:01,440
it's usable and it'll serve for one of our tests.

301
00:14:01,440 --> 00:14:03,440
Ha!

302
00:14:03,440 --> 00:14:05,440
Ha!

303
00:14:05,440 --> 00:14:07,440
Clearly, if we're going to be experimenting

304
00:14:07,440 --> 00:14:09,440
with glass falling from great heights,

305
00:14:09,440 --> 00:14:11,440
we're going to need glass

306
00:14:11,440 --> 00:14:13,440
and we're going to need great heights.

307
00:14:13,440 --> 00:14:15,440
Too low.

308
00:14:15,440 --> 00:14:17,440
Easy.

309
00:14:17,440 --> 00:14:19,440
Great heights, not so much.

310
00:14:19,440 --> 00:14:21,440
A little bit better.

311
00:14:21,440 --> 00:14:23,440
Not a lot of people want to let you drop stuff

312
00:14:23,440 --> 00:14:25,440
off of their buildings unless you come to a building

313
00:14:25,440 --> 00:14:27,440
like this.

314
00:14:27,440 --> 00:14:29,440
Almost.

315
00:14:29,440 --> 00:14:31,440
This is the Santa Rosa Fire Department's

316
00:14:31,440 --> 00:14:33,440
fire training tower.

317
00:14:33,440 --> 00:14:35,440
That's more like it.

318
00:14:35,440 --> 00:14:37,440
Today, I hate heights.

319
00:14:37,440 --> 00:14:39,440
We're going to be dropping large panes of glass

320
00:14:39,440 --> 00:14:41,440
onto

321
00:14:41,440 --> 00:14:43,440
unwilling ballistics, gel and test subjects.

322
00:14:43,440 --> 00:14:45,440
So, we've got a 4 foot

323
00:14:45,440 --> 00:14:47,440
by 6 foot piece of 3

324
00:14:47,440 --> 00:14:49,440
eighths inch thick glass

325
00:14:49,440 --> 00:14:51,440
like what they would have on top of a high-rise.

326
00:14:51,440 --> 00:14:53,440
Not many people know this, but Mimes actually

327
00:14:53,440 --> 00:14:55,440
practice behind an actual pane of glass.

328
00:14:55,440 --> 00:14:57,440
And I'm going to hoist it to 75 feet.

329
00:14:57,440 --> 00:14:59,440
Good.

330
00:14:59,440 --> 00:15:01,440
Where Adam and I are going to drop it.

331
00:15:01,440 --> 00:15:03,440
Looking good.

332
00:15:03,440 --> 00:15:05,440
Now, when you're visualizing a pane of glass falling

333
00:15:05,440 --> 00:15:07,440
and slicing through someone like a guillotine

334
00:15:07,440 --> 00:15:09,440
or a sword, you're probably thinking of something

335
00:15:09,440 --> 00:15:11,440
that looks a little like this.

336
00:15:11,440 --> 00:15:13,440
But

337
00:15:13,440 --> 00:15:15,440
you also probably were watching us

338
00:15:15,440 --> 00:15:17,440
move around our pane of glass and thinking,

339
00:15:17,440 --> 00:15:19,440
wait a minute, that glass doesn't look sharp.

340
00:15:19,440 --> 00:15:21,440
It looks like it's got a kind of a square edge.

341
00:15:21,440 --> 00:15:23,440
Kind of like that. That's because the glass

342
00:15:23,440 --> 00:15:25,440
in an office building is called tempered glass.

343
00:15:25,440 --> 00:15:27,440
It's made to be very hard and it also doesn't

344
00:15:27,440 --> 00:15:29,440
break into shards. It actually breaks

345
00:15:29,440 --> 00:15:31,440
into many, many thousands of little tiny chunks.

346
00:15:31,440 --> 00:15:33,440
Kind of like this.

347
00:15:33,440 --> 00:15:35,440
It didn't break.

348
00:15:35,440 --> 00:15:37,440
Let me say this again.

349
00:15:37,440 --> 00:15:39,440
It breaks into many little pieces like this.

350
00:15:41,440 --> 00:15:43,440
And it's like this.

351
00:15:43,440 --> 00:15:45,440
There you go.

352
00:15:45,440 --> 00:15:47,440
So it's more akin to actually hitting

353
00:15:47,440 --> 00:15:49,440
the melon with the back of my blade rather than

354
00:15:49,440 --> 00:15:51,440
the front, like this.

355
00:15:53,440 --> 00:15:55,440
Now, is that what's going to happen to

356
00:15:55,440 --> 00:15:57,440
our guy when our glass falls on him?

357
00:15:57,440 --> 00:15:59,440
Frankly, I have no idea. I'm just as curious as you are.

358
00:15:59,440 --> 00:16:01,440
All right.

359
00:16:01,440 --> 00:16:03,440
Nobody underneath this.

360
00:16:03,440 --> 00:16:05,440
Jamie, I will meet you up at the top.

361
00:16:07,440 --> 00:16:09,440
Here we go.

362
00:16:11,440 --> 00:16:13,440
I hate heights.

363
00:16:13,440 --> 00:16:15,440
I know nothing's going to happen to me

364
00:16:15,440 --> 00:16:17,440
when I'm in these things.

365
00:16:17,440 --> 00:16:19,440
Man, this is scary.

366
00:16:19,440 --> 00:16:21,440
But I've always been that way.

367
00:16:21,440 --> 00:16:23,440
I just hate heights so intensely.

368
00:16:23,440 --> 00:16:25,440
It's just awful.

369
00:16:27,440 --> 00:16:29,440
Yeah, that's it.

370
00:16:29,440 --> 00:16:31,440
Jamie, this is working beautifully.

371
00:16:31,440 --> 00:16:33,440
Ha ha ha.

372
00:16:33,440 --> 00:16:35,440
Oh.

373
00:16:41,440 --> 00:16:43,440
I can't help but feel like we're about to enact

374
00:16:43,440 --> 00:16:45,440
a scene in a movie called

375
00:16:45,440 --> 00:16:47,440
Clumsy Window Movers.

376
00:16:47,440 --> 00:16:49,440
Ha ha ha.

377
00:16:49,440 --> 00:16:51,440
For clarity, it is worth restating

378
00:16:51,440 --> 00:16:53,440
that what we are looking for from the glass

379
00:16:53,440 --> 00:16:55,440
here is not whether or not it kills him.

380
00:16:55,440 --> 00:16:57,440
Okay, now,

381
00:16:57,440 --> 00:16:59,440
I figure we hoisted over our heads.

382
00:16:59,440 --> 00:17:01,440
Yeah, although that would be the end result

383
00:17:01,440 --> 00:17:03,440
no matter what, if it hit him.

384
00:17:03,440 --> 00:17:05,440
Okay.

385
00:17:05,440 --> 00:17:07,440
Oh my God.

386
00:17:07,440 --> 00:17:09,440
It's that it would clump.

387
00:17:09,440 --> 00:17:11,440
Oh my God.

388
00:17:11,440 --> 00:17:13,440
It's that it would cleave him in two

389
00:17:13,440 --> 00:17:15,440
like my sword did with the melon.

390
00:17:15,440 --> 00:17:17,440
Sheen.

391
00:17:17,440 --> 00:17:19,440
Three, two, one.

392
00:17:23,440 --> 00:17:25,440
Oh.

393
00:17:25,440 --> 00:17:27,440
It's getting a little turn right at the very end.

394
00:17:27,440 --> 00:17:29,440
It looked like it was going to be perfect

395
00:17:29,440 --> 00:17:31,440
and at the very end at Fishtail.

396
00:17:31,440 --> 00:17:33,440
Oh my gosh.

397
00:17:33,440 --> 00:17:35,440
It was so close

398
00:17:35,440 --> 00:17:37,440
for like the first couple of seconds

399
00:17:37,440 --> 00:17:39,440
it seemed to be falling perfectly

400
00:17:39,440 --> 00:17:41,440
like a knife towards him.

401
00:17:41,440 --> 00:17:43,440
I'm like, oh my God, it's going to hit him.

402
00:17:43,440 --> 00:17:45,440
It's going to hit him.

403
00:17:45,440 --> 00:17:47,440
And then what feels like just before it got to our dude

404
00:17:47,440 --> 00:17:49,440
and went like this

405
00:17:49,440 --> 00:17:51,440
and hit the ground perfectly flat

406
00:17:51,440 --> 00:17:53,440
and spread in every direction.

407
00:17:53,440 --> 00:17:55,440
Oh my goodness.

408
00:17:55,440 --> 00:17:57,440
Ha ha ha ha.

409
00:17:57,440 --> 00:17:59,440
It looks worse down here than it did up there.

410
00:17:59,440 --> 00:18:01,440
Oh my God, it's so pretty.

411
00:18:01,440 --> 00:18:03,440
When I was like 10,

412
00:18:03,440 --> 00:18:05,440
I would have taken these home and protected them

413
00:18:05,440 --> 00:18:07,440
and pretended they were diamonds

414
00:18:07,440 --> 00:18:09,440
and pretended I had treasure.

415
00:18:09,440 --> 00:18:11,440
I would have sold them to the neighborhood kids

416
00:18:11,440 --> 00:18:13,440
and made a profit.

417
00:18:13,440 --> 00:18:15,440
It's clear that this test was a fling

418
00:18:15,440 --> 00:18:17,440
and a miss.

419
00:18:17,440 --> 00:18:19,440
To stand a chance of a direct hit split,

420
00:18:19,440 --> 00:18:21,440
they're going to need a plan B.

421
00:18:21,440 --> 00:18:23,440
What do you think?

422
00:18:23,440 --> 00:18:25,440
Should we head back to the shop and make a system

423
00:18:25,440 --> 00:18:27,440
for guiding the glass?

424
00:18:27,440 --> 00:18:29,440
Yeah, I've got some ideas.

425
00:18:29,440 --> 00:18:31,440
Me too.

426
00:18:35,440 --> 00:18:37,440
Lurking innocently in your garden shed,

427
00:18:37,440 --> 00:18:39,440
a lethal accident is waiting to happen.

428
00:18:39,440 --> 00:18:41,440
Or is it?

429
00:18:41,440 --> 00:18:43,440
Oh, oh, oh.

430
00:18:43,440 --> 00:18:45,440
We have been trying to determine

431
00:18:45,440 --> 00:18:47,440
whether a lawnmower can fling rocks

432
00:18:47,440 --> 00:18:49,440
with the same amount of energy as a bullet.

433
00:18:49,440 --> 00:18:51,440
What we'd like to do is measure the speed

434
00:18:51,440 --> 00:18:53,440
at which the rocks are leaving the lawnmower

435
00:18:53,440 --> 00:18:55,440
and then see how that compares

436
00:18:55,440 --> 00:18:57,440
to the speed of an actual bullet.

437
00:18:57,440 --> 00:18:59,440
Before comparing actual bullets

438
00:18:59,440 --> 00:19:01,440
to the speed of a bullet,

439
00:19:01,440 --> 00:19:03,440
we're going to have to make a system

440
00:19:03,440 --> 00:19:05,440
for measuring the speed of a bullet.

441
00:19:05,440 --> 00:19:07,440
Before comparing actual bullets,

442
00:19:07,440 --> 00:19:09,440
they're measuring the mower.

443
00:19:09,440 --> 00:19:11,440
Why am I taking the motor off?

444
00:19:11,440 --> 00:19:13,440
Well, for us to test it in the shop,

445
00:19:13,440 --> 00:19:15,440
we need to look closely at it

446
00:19:15,440 --> 00:19:17,440
and run it for a while.

447
00:19:17,440 --> 00:19:19,440
And so instead of having this noisy,

448
00:19:19,440 --> 00:19:21,440
smelly, gasoline engine

449
00:19:21,440 --> 00:19:23,440
going in here, we're just going to swap it out

450
00:19:23,440 --> 00:19:25,440
with an electric motor nice and clean and quiet.

451
00:19:25,440 --> 00:19:27,440
This thing's stuck.

452
00:19:27,440 --> 00:19:29,440
This thing's stuck.

453
00:19:29,440 --> 00:19:31,440
This thing's stuck.

454
00:19:31,440 --> 00:19:33,440
And we got it.

455
00:19:33,440 --> 00:19:35,440
Ugh!

456
00:19:35,440 --> 00:19:37,440
The way this motor is wound,

457
00:19:37,440 --> 00:19:39,440
it's going to give us 100 rpm

458
00:19:39,440 --> 00:19:41,440
for every bolt that it sees.

459
00:19:41,440 --> 00:19:43,440
And so given that the gas engine

460
00:19:43,440 --> 00:19:45,440
ran at 3600 rpm,

461
00:19:45,440 --> 00:19:47,440
we need to feed this 36 volts

462
00:19:47,440 --> 00:19:49,440
to see the same rpm.

463
00:19:49,440 --> 00:19:51,440
But the thing is, if we give it that

464
00:19:51,440 --> 00:19:53,440
voltage all at once,

465
00:19:53,440 --> 00:19:55,440
it's going to spin that blade up

466
00:19:55,440 --> 00:19:57,440
to full rpm in like a minute

467
00:19:57,440 --> 00:19:59,440
and then we're going to have to

468
00:19:59,440 --> 00:20:01,440
give it to full rpm

469
00:20:01,440 --> 00:20:03,440
in like a millisecond.

470
00:20:03,440 --> 00:20:05,440
You just build a lawn mower

471
00:20:05,440 --> 00:20:07,440
that I want to be behind a blast shield

472
00:20:07,440 --> 00:20:09,440
in order to start.

473
00:20:09,440 --> 00:20:11,440
And that's scary.

474
00:20:11,440 --> 00:20:13,440
It might end up putting the blade

475
00:20:13,440 --> 00:20:15,440
in the wall or in me or something

476
00:20:15,440 --> 00:20:17,440
because something's going to break.

477
00:20:17,440 --> 00:20:19,440
So I've got to figure out a way

478
00:20:19,440 --> 00:20:21,440
of doing it a little more gently.

479
00:20:21,440 --> 00:20:23,440
To gently deliver that power,

480
00:20:23,440 --> 00:20:25,440
once again, Jamie uses equipment

481
00:20:25,440 --> 00:20:27,440
in ways for which it was never intended.

482
00:20:27,440 --> 00:20:29,440
He's hooked up a DC power

483
00:20:29,440 --> 00:20:31,440
welding machine to a lawn mower.

484
00:20:31,440 --> 00:20:33,440
I love it when things actually

485
00:20:33,440 --> 00:20:35,440
work the way you hope.

486
00:20:35,440 --> 00:20:37,440
It is somehow

487
00:20:37,440 --> 00:20:39,440
a little counter-intuitive to run

488
00:20:39,440 --> 00:20:41,440
a motor off of a welder, but

489
00:20:41,440 --> 00:20:43,440
DC power is DC power.

490
00:20:43,440 --> 00:20:45,440
That's amazing. Alright, let's get it up on a stand.

491
00:20:49,440 --> 00:20:51,440
We need to be able to deliver the rock

492
00:20:51,440 --> 00:20:53,440
to the spinning blade

493
00:20:53,440 --> 00:20:55,440
in a way that we can actually see what's going on.

494
00:20:55,440 --> 00:20:57,440
Now it's looking like something.

495
00:20:57,440 --> 00:20:59,440
But Adam and I have come up with a way

496
00:20:59,440 --> 00:21:01,440
of doing it, which involves

497
00:21:01,440 --> 00:21:03,440
putting the whole mower up on top

498
00:21:03,440 --> 00:21:05,440
of a sheet of clear acrylic

499
00:21:05,440 --> 00:21:07,440
and then we can see from underneath.

500
00:21:07,440 --> 00:21:09,440
Yet another

501
00:21:09,440 --> 00:21:11,440
in a long line of pristine surfaces

502
00:21:11,440 --> 00:21:13,440
soon to be destroyed and sullied

503
00:21:13,440 --> 00:21:15,440
in our hunt for the truth.

504
00:21:15,440 --> 00:21:17,440
And we'll simply

505
00:21:17,440 --> 00:21:19,440
raise the mower,

506
00:21:19,440 --> 00:21:21,440
get the mower up to speed, and then

507
00:21:21,440 --> 00:21:23,440
lower it down onto the rock.

508
00:21:23,440 --> 00:21:25,440
So how are we going to keep this stuff from

509
00:21:25,440 --> 00:21:27,440
going all over the shop?

510
00:21:27,440 --> 00:21:29,440
Well, we cut away the whole side here, so we wanted to go there.

511
00:21:29,440 --> 00:21:31,440
So I thought we'd put some upright

512
00:21:31,440 --> 00:21:33,440
plywood here to protect the walls.

513
00:21:33,440 --> 00:21:35,440
We already know that a lawn mower can hurl

514
00:21:35,440 --> 00:21:37,440
a rock at a fairly good speed.

515
00:21:37,440 --> 00:21:39,440
But we don't know what that speed

516
00:21:39,440 --> 00:21:41,440
is.

517
00:21:41,440 --> 00:21:43,440
Cool. Alright. That's position one.

518
00:21:43,440 --> 00:21:45,440
Medium-sized rock. So we're going to power

519
00:21:45,440 --> 00:21:47,440
up this lawn mower to its full speed.

520
00:21:47,440 --> 00:21:49,440
We're going to feed rocks into it,

521
00:21:49,440 --> 00:21:51,440
watch them on our high-speed camera, and

522
00:21:51,440 --> 00:21:53,440
measure exactly how fast they leave.

523
00:21:53,440 --> 00:21:55,440
You ready? I'm ready.

524
00:21:55,440 --> 00:21:57,440
Let's do this.

525
00:21:59,440 --> 00:22:01,440
18,

526
00:22:01,440 --> 00:22:03,440
25,

527
00:22:03,440 --> 00:22:05,440
32,

528
00:22:05,440 --> 00:22:07,440
Ha!

529
00:22:07,440 --> 00:22:09,440
F***!

530
00:22:09,440 --> 00:22:11,440
34,

531
00:22:11,440 --> 00:22:13,440
speed.

532
00:22:13,440 --> 00:22:15,440
Alright. Here we go.

533
00:22:15,440 --> 00:22:17,440
Dropping a lawn mower onto a rock.

534
00:22:17,440 --> 00:22:19,440
Three, two, one.

535
00:22:21,440 --> 00:22:23,440
Cut it!

536
00:22:23,440 --> 00:22:25,440
Blink, and it's gone.

537
00:22:25,440 --> 00:22:27,440
Because when the mower is lowered,

538
00:22:27,440 --> 00:22:29,440
the blade instantly

539
00:22:29,440 --> 00:22:31,440
slices the stone into chunks.

540
00:22:31,440 --> 00:22:33,440
Oh, wow.

541
00:22:33,440 --> 00:22:35,440
It just absolutely decimated that piece.

542
00:22:35,440 --> 00:22:37,440
Question is,

543
00:22:37,440 --> 00:22:39,440
were any of the fragments moving

544
00:22:39,440 --> 00:22:41,440
at a bullet-like velocity?

545
00:22:41,440 --> 00:22:43,440
The fastest chunk was going 250 feet

546
00:22:43,440 --> 00:22:45,440
per second, and that's actually pretty

547
00:22:45,440 --> 00:22:47,440
significant for a chunk of rock about

548
00:22:47,440 --> 00:22:49,440
one inch long and a half inch wide.

549
00:22:49,440 --> 00:22:51,440
But we're going to keep running this,

550
00:22:51,440 --> 00:22:53,440
see if we can't find even faster debris.

551
00:22:53,440 --> 00:22:57,440
250 feet per second is a good start.

552
00:22:57,440 --> 00:22:59,440
Okay, sir. We got a whole pile going in.

553
00:22:59,440 --> 00:23:01,440
But this time, they're giving their mower

554
00:23:01,440 --> 00:23:03,440
more to aim for.

555
00:23:03,440 --> 00:23:05,440
Start her up.

556
00:23:05,440 --> 00:23:07,440
What could possibly go wrong?

557
00:23:07,440 --> 00:23:09,440
Speed.

558
00:23:09,440 --> 00:23:11,440
Dropping big pile of rocks.

559
00:23:11,440 --> 00:23:13,440
Cover your eyes.

560
00:23:13,440 --> 00:23:15,440
Three, two, one.

561
00:23:19,440 --> 00:23:21,440
Cut it!

562
00:23:21,440 --> 00:23:23,440
Everybody okay?

563
00:23:23,440 --> 00:23:25,440
Chunk.

564
00:23:27,440 --> 00:23:29,440
Chunk made it out.

565
00:23:29,440 --> 00:23:31,440
I hope we got the shot because that was

566
00:23:31,440 --> 00:23:33,440
the sound of the blade coming off of the motor.

567
00:23:33,440 --> 00:23:35,440
Oh, really?

568
00:23:35,440 --> 00:23:37,440
Yeah.

569
00:23:37,440 --> 00:23:39,440
While Jamie inspects the carnage,

570
00:23:39,440 --> 00:23:41,440
Wow.

571
00:23:41,440 --> 00:23:43,440
We cracked our acrylic bottom.

572
00:23:43,440 --> 00:23:45,440
Adam, ignoring the mess he's made.

573
00:23:45,440 --> 00:23:47,440
Here's the blade.

574
00:23:47,440 --> 00:23:49,440
queues up the high speed.

575
00:23:49,440 --> 00:23:51,440
Wow, dude.

576
00:23:51,440 --> 00:23:53,440
We got the hit that I was hoping to get.

577
00:23:55,440 --> 00:23:57,440
Watch the leading edge of the blade here.

578
00:23:57,440 --> 00:23:59,440
Boom.

579
00:23:59,440 --> 00:24:01,440
That piece. 400 feet per second.

580
00:24:01,440 --> 00:24:03,440
272 miles per hour.

581
00:24:03,440 --> 00:24:05,440
Well,

582
00:24:05,440 --> 00:24:07,440
I feel like we're in some very dangerous territory.

583
00:24:07,440 --> 00:24:09,440
Dangerous for sure.

584
00:24:09,440 --> 00:24:11,440
But the crucial question is,

585
00:24:11,440 --> 00:24:13,440
how does it compare to the speed of a bullet?

586
00:24:17,440 --> 00:24:19,440
Well, Jamie,

587
00:24:19,440 --> 00:24:21,440
with high speed camera in tow,

588
00:24:21,440 --> 00:24:23,440
fired up at the gun range.

589
00:24:25,440 --> 00:24:27,440
Define now.

590
00:24:27,440 --> 00:24:29,440
Three, two, one.

591
00:24:29,440 --> 00:24:31,440
The slowest bullet we measured

592
00:24:31,440 --> 00:24:33,440
went at 1,000 feet per second.

593
00:24:33,440 --> 00:24:35,440
The 357,

594
00:24:35,440 --> 00:24:37,440
which was much faster,

595
00:24:37,440 --> 00:24:39,440
went at 1,400 feet per second.

596
00:24:39,440 --> 00:24:41,440
Now, the fastest rock

597
00:24:41,440 --> 00:24:43,440
we got off of our lawnmower

598
00:24:43,440 --> 00:24:45,440
went 400 feet per second,

599
00:24:45,440 --> 00:24:47,440
which is

600
00:24:47,440 --> 00:24:49,440
nowhere close.

601
00:24:49,440 --> 00:24:51,440
But it's not busted right there.

602
00:24:51,440 --> 00:24:53,440
No, no, no, no.

603
00:24:53,440 --> 00:24:55,440
Because while this rock is bigger and slower than this bullet,

604
00:24:55,440 --> 00:24:57,440
it's heavier.

605
00:24:57,440 --> 00:24:59,440
What I'm wondering now is,

606
00:24:59,440 --> 00:25:01,440
is there a rig I can build

607
00:25:01,440 --> 00:25:03,440
that can compare the amount of energy

608
00:25:03,440 --> 00:25:05,440
the bullet brings to the equation

609
00:25:05,440 --> 00:25:07,440
and compare it to the amount of energy the rock brings?

610
00:25:07,440 --> 00:25:09,440
I think I can.

611
00:25:09,440 --> 00:25:11,440
Three, two, one.

612
00:25:11,440 --> 00:25:13,440
While Adam cogitates

613
00:25:13,440 --> 00:25:15,440
the ball,

614
00:25:15,440 --> 00:25:17,440
he's thinking outside the box

615
00:25:17,440 --> 00:25:19,440
for Glass Guillotine.

616
00:25:19,440 --> 00:25:21,440
Clearly, dropping glass off the building

617
00:25:21,440 --> 00:25:23,440
isn't going to be a repeatable way

618
00:25:23,440 --> 00:25:25,440
for us to test this story.

619
00:25:25,440 --> 00:25:27,440
Oh!

620
00:25:27,440 --> 00:25:29,440
So we're going to need to come up with a mechanism

621
00:25:29,440 --> 00:25:31,440
for reliably making the glass hit exactly where we want.

622
00:25:31,440 --> 00:25:33,440
And I have an idea, except in order to

623
00:25:33,440 --> 00:25:35,440
talk about it, I'm going to build a little model

624
00:25:35,440 --> 00:25:37,440
of the fire training tower.

625
00:25:37,440 --> 00:25:39,440
And instead of an exotic material,

626
00:25:39,440 --> 00:25:41,440
I love making corners match up.

627
00:25:41,440 --> 00:25:43,440
So we just got in the mail.

628
00:25:43,440 --> 00:25:45,440
Ta-da!

629
00:25:45,440 --> 00:25:47,440
I know it doesn't look like much, but check this out.

630
00:25:47,440 --> 00:25:49,440
This coat hanger will be a welded steel rack

631
00:25:49,440 --> 00:25:51,440
which we sit on the lip of the building.

632
00:25:51,440 --> 00:25:53,440
You are clear!

633
00:25:53,440 --> 00:25:55,440
These red pieces of parachute cord

634
00:25:55,440 --> 00:25:57,440
are guide wires which we mount to the ground.

635
00:25:57,440 --> 00:25:59,440
Awesome!

636
00:25:59,440 --> 00:26:01,440
The glass has riders on it

637
00:26:01,440 --> 00:26:03,440
that keep it aligned with the guide wires.

638
00:26:03,440 --> 00:26:05,440
They say the glass is tempered, but is it

639
00:26:05,440 --> 00:26:07,440
bad tempered?

640
00:26:07,440 --> 00:26:09,440
We bring it up with a winch.

641
00:26:09,440 --> 00:26:11,440
Go ahead and winch up the glass.

642
00:26:11,440 --> 00:26:13,440
Oh, here she comes.

643
00:26:17,440 --> 00:26:19,440
Drop it from the top and

644
00:26:19,440 --> 00:26:21,440
wheeeee!

645
00:26:21,440 --> 00:26:23,440
It hits our test subject square

646
00:26:23,440 --> 00:26:25,440
where we want him to

647
00:26:25,440 --> 00:26:27,440
and slices him right in the half.

648
00:26:27,440 --> 00:26:29,440
We're not. That's what we're going to find out.

649
00:26:31,440 --> 00:26:33,440
And with Adam's model design rigged,

650
00:26:33,440 --> 00:26:35,440
the glass is poised to come crashing down

651
00:26:35,440 --> 00:26:37,440
in controlled fashion.

652
00:26:39,440 --> 00:26:41,440
It is really just about to happen.

653
00:26:41,440 --> 00:26:43,440
I can't wait to see this.

654
00:26:43,440 --> 00:26:45,440
It's time to find out

655
00:26:45,440 --> 00:26:47,440
if our unsuspecting bystander

656
00:26:47,440 --> 00:26:49,440
will be neatly split in two.

657
00:26:51,440 --> 00:26:55,440
In three, two, one.

658
00:26:57,440 --> 00:26:59,440
Here it comes.

659
00:26:59,440 --> 00:27:01,440
BAM!

660
00:27:01,440 --> 00:27:03,440
That was perfect!

661
00:27:05,440 --> 00:27:07,440
Dude, that was beautiful!

662
00:27:07,440 --> 00:27:09,440
They're still in one piece.

663
00:27:09,440 --> 00:27:11,440
It looks like he's still in one piece.

664
00:27:11,440 --> 00:27:13,440
Of course, there's blood everywhere.

665
00:27:19,440 --> 00:27:21,440
Well, every one of our methodologies worked beautifully.

666
00:27:21,440 --> 00:27:23,440
The glass dropped, it hit our dude

667
00:27:23,440 --> 00:27:25,440
exactly where we wanted it to,

668
00:27:25,440 --> 00:27:27,440
and it did not leave him in twain.

669
00:27:27,440 --> 00:27:29,440
No, it merely

670
00:27:29,440 --> 00:27:31,440
beat the living crap out of him.

671
00:27:31,440 --> 00:27:33,440
But there's still only one dude.

672
00:27:33,440 --> 00:27:35,440
There's not two half dudes.

673
00:27:35,440 --> 00:27:37,440
I've got to try something out.

674
00:27:39,440 --> 00:27:41,440
Yep, this slasher story

675
00:27:41,440 --> 00:27:43,440
It's going to be a hard show.

676
00:27:43,440 --> 00:27:45,440
is about to get real edgy.

677
00:27:47,440 --> 00:27:49,440
Oh!

678
00:27:57,440 --> 00:27:59,440
Could a one in a million high-rise slip

679
00:27:59,440 --> 00:28:01,440
ever really slice you in half?

680
00:28:03,440 --> 00:28:05,440
Not according to the evidence so far.

681
00:28:05,440 --> 00:28:07,440
And you might be watching thinking,

682
00:28:07,440 --> 00:28:09,440
of course it didn't you, idiots.

683
00:28:09,440 --> 00:28:11,440
That tempered glass you dropped had this big square edge on it.

684
00:28:11,440 --> 00:28:13,440
But that's the thing with tempered glass.

685
00:28:13,440 --> 00:28:15,440
It doesn't break and have sharp edges.

686
00:28:15,440 --> 00:28:17,440
For that, you've got to move

687
00:28:17,440 --> 00:28:19,440
to plate glass.

688
00:28:19,440 --> 00:28:21,440
Now, they don't use plate glass in office buildings

689
00:28:21,440 --> 00:28:23,440
specifically for this reason,

690
00:28:23,440 --> 00:28:25,440
but for due diligence,

691
00:28:25,440 --> 00:28:27,440
we've got a piece of plate glass here.

692
00:28:27,440 --> 00:28:29,440
And we're going to break this

693
00:28:29,440 --> 00:28:31,440
so that we get a nice, clean,

694
00:28:31,440 --> 00:28:33,440
broken edge of plate glass.

695
00:28:35,440 --> 00:28:37,440
All right.

696
00:28:37,440 --> 00:28:39,440
And we're going to drop that on the next

697
00:28:39,440 --> 00:28:41,440
unsuspecting bystander we pulled out of our mold.

698
00:28:41,440 --> 00:28:43,440
Okay, I'm going to move them in.

699
00:28:43,440 --> 00:28:45,440
Yep.

700
00:28:45,440 --> 00:28:47,440
Our next victim doesn't have blood bags.

701
00:28:47,440 --> 00:28:49,440
That is right down the center.

702
00:28:49,440 --> 00:28:51,440
Not quite as much fun, but a little bit more

703
00:28:51,440 --> 00:28:53,440
consistent as far as the physics.

704
00:28:53,440 --> 00:28:55,440
Go ahead and raise him in three.

705
00:28:55,440 --> 00:28:57,440
Two, one, go.

706
00:28:57,440 --> 00:28:59,440
While it's on its way up,

707
00:28:59,440 --> 00:29:01,440
I feel confident that I think

708
00:29:01,440 --> 00:29:03,440
that that is going to slice our dude in half.

709
00:29:03,440 --> 00:29:05,440
The edges of that glass, they're really sharp.

710
00:29:05,440 --> 00:29:07,440
It's going to be a harsh up.

711
00:29:07,440 --> 00:29:09,440
All right.

712
00:29:09,440 --> 00:29:11,440
Go ahead and count it down and let it go.

713
00:29:11,440 --> 00:29:13,440
And three.

714
00:29:13,440 --> 00:29:15,440
Two.

715
00:29:15,440 --> 00:29:17,440
One.

716
00:29:17,440 --> 00:29:19,440
Here it comes.

717
00:29:19,440 --> 00:29:21,440
It's good. It's good.

718
00:29:21,440 --> 00:29:23,440
It's good.

719
00:29:23,440 --> 00:29:25,440
Here it comes.

720
00:29:25,440 --> 00:29:27,440
It's good. It's good.

721
00:29:35,440 --> 00:29:37,440
That was beautiful.

722
00:29:37,440 --> 00:29:39,440
I mean, I don't know how well it worked, but it looked great.

723
00:29:49,440 --> 00:29:51,440
Dude, that would be

724
00:29:51,440 --> 00:29:53,440
amazing.

725
00:29:53,440 --> 00:29:55,440
I'm gonna tell you about the

726
00:29:55,440 --> 00:29:57,440
most amazing thing I've ever seen.

727
00:29:57,440 --> 00:29:59,440
I've seen this scene in a movie

728
00:29:59,440 --> 00:30:01,440
where I've been cleaved as I've

729
00:30:01,440 --> 00:30:03,440
been saying all episode long,

730
00:30:03,440 --> 00:30:05,440
in twain.

731
00:30:05,440 --> 00:30:07,440
Not exactly a bull's-eye to the brain,

732
00:30:07,440 --> 00:30:09,440
but in twain he truly is.

733
00:30:09,440 --> 00:30:11,440
I couldn't see

734
00:30:11,440 --> 00:30:13,440
that chunk fly off of him from

735
00:30:13,440 --> 00:30:15,440
where I was standing.

736
00:30:15,440 --> 00:30:17,440
It just looked like unfettered destruction.

737
00:30:17,440 --> 00:30:19,440
But dude, that is,

738
00:30:19,440 --> 00:30:21,640
so that people don't get cut.

739
00:30:21,640 --> 00:30:23,640
And the result is appropriate to that.

740
00:30:23,640 --> 00:30:26,480
Our guy would have had his skull crushed

741
00:30:26,480 --> 00:30:28,120
with a lot of bones broken,

742
00:30:28,120 --> 00:30:30,920
but he wouldn't have been cleaved in half.

743
00:30:30,920 --> 00:30:33,920
The other one we dropped a piece of plate glass on

744
00:30:33,920 --> 00:30:36,220
that had a broken edge that was very sharp.

745
00:30:36,220 --> 00:30:40,120
And as a result, he got cut cleanly in half.

746
00:30:40,120 --> 00:30:42,220
The end result is the same.

747
00:30:42,220 --> 00:30:44,600
You would have died.

748
00:30:44,600 --> 00:30:45,940
Take your pick.

749
00:30:45,940 --> 00:30:48,700
Can glass falling from a high rise cut you in two?

750
00:30:48,720 --> 00:30:52,500
This is an interesting one because it's kind of a yes or no situation.

751
00:30:52,500 --> 00:30:55,200
If it's the glass they make high rises from,

752
00:30:55,200 --> 00:30:57,600
then no, it's not going to cut you in two.

753
00:30:57,600 --> 00:31:00,000
It's going to kill you, but it's not going to leave you in two parts.

754
00:31:00,000 --> 00:31:01,700
But if it's the wrong kind of glass,

755
00:31:01,700 --> 00:31:06,100
then absolutely it can leave you in two big chunks.

756
00:31:06,100 --> 00:31:10,500
So right kind is busted, but wrong kind is plausible.

757
00:31:10,500 --> 00:31:11,700
Bless a plausible.

758
00:31:11,700 --> 00:31:13,100
All right, I'll buy that.

759
00:31:13,100 --> 00:31:14,300
All right, let's get out of here.

760
00:31:14,300 --> 00:31:26,500
Back on the trail of the stone cold killer.

761
00:31:26,500 --> 00:31:31,100
Adam and Jamie have proven a rock from a mower

762
00:31:31,100 --> 00:31:33,500
does not travel as fast as a bullet,

763
00:31:33,500 --> 00:31:37,000
but speed is not the only vicious vector.

764
00:31:37,000 --> 00:31:39,800
So we are looking to compare the amount of energy

765
00:31:39,800 --> 00:31:41,500
generated from an impact with a bullet

766
00:31:41,700 --> 00:31:44,600
with the energy generated from the impact with a rock.

767
00:31:45,500 --> 00:31:49,400
So imagine that this hammer can swing like a pendulum.

768
00:31:49,400 --> 00:31:52,400
Then let's take a gun and shoot the face of this hammer.

769
00:31:52,400 --> 00:31:53,400
What's going to happen?

770
00:31:53,400 --> 00:31:55,100
It's an indicator of how much energy

771
00:31:55,100 --> 00:31:56,900
the bullet brings to the equation.

772
00:31:56,900 --> 00:31:59,700
Now, if I fire a stone at the same hammer

773
00:31:59,700 --> 00:32:01,800
at this speed it would be kicked by a lawnmower

774
00:32:01,800 --> 00:32:04,200
and the hammer moves the same amount.

775
00:32:04,200 --> 00:32:07,600
Well, then we could conclude that the amount of energy

776
00:32:07,600 --> 00:32:09,700
being brought to the equation by the bullet

777
00:32:09,700 --> 00:32:12,000
is the same as the stone.

778
00:32:12,000 --> 00:32:14,500
That's the theory anyway.

779
00:32:14,500 --> 00:32:15,600
Let's see if it works.

780
00:32:15,600 --> 00:32:17,700
Yep, the heavy stone may have been moving

781
00:32:17,700 --> 00:32:19,500
more slowly than the lighter bullet.

782
00:32:22,300 --> 00:32:23,700
That's beautiful.

783
00:32:23,700 --> 00:32:26,000
But this pendulum rig will illustrate

784
00:32:26,000 --> 00:32:27,900
and compare the energy of each.

785
00:32:29,800 --> 00:32:32,500
Its acrylic impact pad will efficiently transfer

786
00:32:32,500 --> 00:32:34,900
the energy of the bullet to the pendulum

787
00:32:34,900 --> 00:32:37,000
and can be replaced for each test.

788
00:32:38,000 --> 00:32:40,000
Well, that looks nifty.

789
00:32:40,000 --> 00:32:41,800
With the rig ready to swing,

790
00:32:41,800 --> 00:32:44,400
the first test will be to measure the bullet's impact.

791
00:32:44,400 --> 00:32:45,400
Okay.

792
00:32:45,400 --> 00:32:47,800
And for that, it's back down to the gun range.

793
00:32:50,800 --> 00:32:51,800
Gun is hot.

794
00:32:52,800 --> 00:32:55,800
Alright, 357 on your mark.

795
00:32:55,800 --> 00:32:57,600
Okay, here we go.

796
00:32:57,600 --> 00:32:59,600
Hopefully this doesn't wreck the rig.

797
00:32:59,600 --> 00:33:02,800
And three, two, one.

798
00:33:02,800 --> 00:33:03,800
Good.

799
00:33:05,800 --> 00:33:08,800
The pendulum peaked at 60 degrees,

800
00:33:08,800 --> 00:33:10,800
but working on the basis that...

801
00:33:10,800 --> 00:33:12,800
If it ain't repeatable, it ain't science.

802
00:33:12,800 --> 00:33:14,800
The guys go again.

803
00:33:15,800 --> 00:33:18,800
In, three, two, one.

804
00:33:21,800 --> 00:33:22,800
Nice.

805
00:33:22,800 --> 00:33:24,800
That looked pretty consistent.

806
00:33:25,800 --> 00:33:28,800
We did our two tests with 357 and they were consistent.

807
00:33:28,800 --> 00:33:30,800
They were about 60 degrees.

808
00:33:30,800 --> 00:33:33,800
So we've got the data we need to move on to stones

809
00:33:33,800 --> 00:33:34,800
out of the lawnmower.

810
00:33:38,800 --> 00:33:41,800
But if you thought that means no more guns,

811
00:33:42,800 --> 00:33:44,800
then think again.

812
00:33:52,800 --> 00:33:53,800
Wow.

813
00:33:54,800 --> 00:33:57,800
Because stones from the lawnmower are hard to aim,

814
00:33:57,800 --> 00:34:01,800
because Adam's pendulum target is very small.

815
00:34:01,800 --> 00:34:03,800
We're going to take the lawnmower out of the equation

816
00:34:03,800 --> 00:34:06,800
and use a pneumatic launcher instead.

817
00:34:07,800 --> 00:34:09,800
I'm going to first check to see that it's shooting the rocket

818
00:34:09,800 --> 00:34:10,800
at the correct speed.

819
00:34:10,800 --> 00:34:11,800
406.

820
00:34:11,800 --> 00:34:12,800
Seriously?

821
00:34:13,800 --> 00:34:14,800
Awesome.

822
00:34:14,800 --> 00:34:16,800
Let's bring it in and shoot this thing.

823
00:34:16,800 --> 00:34:18,800
And then we're going to bring in Adam's energy rig,

824
00:34:18,800 --> 00:34:21,800
hit it with a rock shot at 400 feet per second,

825
00:34:21,800 --> 00:34:23,800
and see how far a pendulum goes.

826
00:34:24,800 --> 00:34:25,800
This is it.

827
00:34:25,800 --> 00:34:26,800
Good to go.

828
00:34:26,800 --> 00:34:27,800
And his safety's off.

829
00:34:27,800 --> 00:34:30,800
Will a stone the same mass and velocity

830
00:34:30,800 --> 00:34:34,800
firing in three as the fastest speed test stone

831
00:34:35,800 --> 00:34:38,800
match the energy of the lighter lethal bullet?

832
00:34:39,800 --> 00:34:40,800
One.

833
00:34:45,800 --> 00:34:47,800
Dude, we got to see the video,

834
00:34:47,800 --> 00:34:50,800
but I swear that went past 60 degrees.

835
00:34:52,800 --> 00:34:54,800
With the crucial shot queued up,

836
00:34:54,800 --> 00:34:56,800
did the rock hit the right angle?

837
00:34:56,800 --> 00:34:58,800
See how high it actually went.

838
00:34:59,800 --> 00:35:00,800
Wait.

839
00:35:00,800 --> 00:35:01,800
Oh my gosh.

840
00:35:01,800 --> 00:35:02,800
Dude!

841
00:35:02,800 --> 00:35:03,800
Dude!

842
00:35:03,800 --> 00:35:05,800
It went above the 357.

843
00:35:05,800 --> 00:35:08,800
That's 66 degrees.

844
00:35:10,800 --> 00:35:13,800
That is more energy from the rock.

845
00:35:13,800 --> 00:35:14,800
I'm sorry I'm yelling,

846
00:35:14,800 --> 00:35:16,800
but I totally didn't expect this result.

847
00:35:16,800 --> 00:35:18,800
That is more energy from the rock

848
00:35:18,800 --> 00:35:20,800
than from a bullet from a 357.

849
00:35:20,800 --> 00:35:22,800
That is amazing.

850
00:35:23,800 --> 00:35:24,800
Shocking.

851
00:35:25,800 --> 00:35:26,800
Totally awesome.

852
00:35:27,800 --> 00:35:30,800
I have been expressing my doubts about confirming this story.

853
00:35:30,800 --> 00:35:32,800
Since the beginning,

854
00:35:32,800 --> 00:35:34,800
I just never thought the rock was going to have

855
00:35:34,800 --> 00:35:37,800
anywhere close to the amount of energy of a 357 bullet,

856
00:35:37,800 --> 00:35:40,800
and yet it exceeded it.

857
00:35:40,800 --> 00:35:43,800
That, I knew lawnmowers were scary.

858
00:35:43,800 --> 00:35:45,800
I just didn't know how scary.

859
00:35:45,800 --> 00:35:47,800
So with everything that we tested,

860
00:35:47,800 --> 00:35:49,800
I think we have definitively proven,

861
00:35:49,800 --> 00:35:50,800
and frankly I'm astonished by this,

862
00:35:50,800 --> 00:35:53,800
but that a rock thrown from a lawnmower

863
00:35:53,800 --> 00:35:55,800
can possibly have as much or more power

864
00:35:55,800 --> 00:35:57,800
than a bullet from a 357.

865
00:35:58,800 --> 00:36:01,800
I'm astonished, but this one's confirmed.

866
00:36:01,800 --> 00:36:03,800
Yeah, I was surprised too.

867
00:36:03,800 --> 00:36:05,800
But you know that gave me an idea.

868
00:36:05,800 --> 00:36:06,800
What?

869
00:36:07,800 --> 00:36:11,800
I want to make the lawnmower from hell.

870
00:36:13,800 --> 00:36:15,800
You do that, I'm going to go home and hide.

871
00:36:20,800 --> 00:36:21,800
Yeah!

872
00:36:28,800 --> 00:36:32,800
With typical enthusiasm for engineering extremes,

873
00:36:33,800 --> 00:36:37,800
the Heinemann's going all out to turn a dream domestic mower

874
00:36:37,800 --> 00:36:40,800
into a deadly weaponized nightmare.

875
00:36:41,800 --> 00:36:43,800
And the key to his hellish vision...

876
00:36:43,800 --> 00:36:44,800
That's going to be sweet.

877
00:36:44,800 --> 00:36:47,800
...is to load up with a whole load more power.

878
00:36:47,800 --> 00:36:50,800
Oh my god, that's one big battery.

879
00:36:50,800 --> 00:36:54,800
What this is, is a bank of about 90 volts

880
00:36:54,800 --> 00:36:56,800
at about 1800 amps.

881
00:36:56,800 --> 00:36:59,800
That means that shorting some of these

882
00:36:59,800 --> 00:37:03,800
would pretty much be like setting off a stick of dynamite.

883
00:37:08,800 --> 00:37:11,800
What are we doing back here at the Chabot gun range?

884
00:37:11,800 --> 00:37:13,800
Well, remember that we have absolutely determined

885
00:37:13,800 --> 00:37:15,800
that a lawnmower can curl a rock

886
00:37:15,800 --> 00:37:20,800
with the same amount or greater force than a bullet from a .357.

887
00:37:20,800 --> 00:37:23,800
That means that a lawnmower can be weaponized,

888
00:37:23,800 --> 00:37:25,800
and that fact...

889
00:37:25,800 --> 00:37:28,800
Well, let's just say that fact was too tempting for Jamie.

890
00:37:28,800 --> 00:37:31,800
When it comes to terrifying engineering

891
00:37:31,800 --> 00:37:33,800
and gratuitous ramping up,

892
00:37:33,800 --> 00:37:36,800
the Heinemann has history.

893
00:37:36,800 --> 00:37:38,800
I call him my little pop gun.

894
00:37:38,800 --> 00:37:40,800
When he decides to go over the top,

895
00:37:40,800 --> 00:37:43,800
it's a good idea to duck, cover,

896
00:37:43,800 --> 00:37:47,800
and wear a heart out at a safe distance.

897
00:37:59,800 --> 00:38:02,800
Introducing the lawnmower from hell.

898
00:38:02,800 --> 00:38:05,800
You've got 200 horsepower of electric car motors,

899
00:38:05,800 --> 00:38:09,800
1800 amps of lithium batteries.

900
00:38:09,800 --> 00:38:13,800
They'll be spinning a 50-pound tool steel blade

901
00:38:13,800 --> 00:38:17,800
at upwards of 5,000 RPM.

902
00:38:17,800 --> 00:38:19,800
Put it all together,

903
00:38:19,800 --> 00:38:21,800
and you really don't want to try this at home.

904
00:38:25,800 --> 00:38:28,800
First up, we're going to get the beast here a little taste.

905
00:38:28,800 --> 00:38:30,800
Just a little taste.

906
00:38:30,800 --> 00:38:32,800
It's a bucket of blue water.

907
00:38:32,800 --> 00:38:34,800
Go for it!

908
00:38:40,800 --> 00:38:45,800
Oh, I've barely been so happy to be behind the bulletproof shields.

909
00:38:50,800 --> 00:38:52,800
He's approaching six feet.

910
00:38:52,800 --> 00:38:54,800
Four feet.

911
00:38:54,800 --> 00:38:56,800
Two feet, it goes!

912
00:38:56,800 --> 00:38:58,800
Boom!

913
00:38:58,800 --> 00:39:01,800
Ha-ha-ha-ha-ha-ha-ha-ha!

914
00:39:10,800 --> 00:39:13,800
Dude, that was beautiful.

915
00:39:13,800 --> 00:39:16,800
Tell you what, why don't you take this thing around the corner?

916
00:39:16,800 --> 00:39:19,800
I'll set up a really fun course for you to implement

917
00:39:19,800 --> 00:39:21,800
as much destruction as possible.

918
00:39:21,800 --> 00:39:23,800
I'll let you know when we're ready for you.

919
00:39:23,800 --> 00:39:25,800
Okay.

920
00:39:25,800 --> 00:39:27,800
So how do you put a ridiculously souped-up

921
00:39:27,800 --> 00:39:30,800
and almost definitely dangerous lawnmower through its paces?

922
00:39:30,800 --> 00:39:33,800
I decided on a broad range of material.

923
00:39:33,800 --> 00:39:35,800
Now we're getting serious.

924
00:39:35,800 --> 00:39:38,800
I wanted some small, hard things to do,

925
00:39:38,800 --> 00:39:41,800
small, hard things to get that bullet-like carnage,

926
00:39:41,800 --> 00:39:43,800
like a brat house lawn.

927
00:39:43,800 --> 00:39:47,800
And I wanted some big things to get some awesome high-speed camera carnage.

928
00:39:47,800 --> 00:39:51,800
I call this section the pallet cleanser.

929
00:39:51,800 --> 00:39:53,800
My prediction?

930
00:39:53,800 --> 00:39:55,800
Gotta have some willing victims.

931
00:39:55,800 --> 00:39:57,800
Frankly, I just hope no one gets hurt.

932
00:39:57,800 --> 00:40:00,800
Last one, like some sort of kumbaya dance circle.

933
00:40:00,800 --> 00:40:04,800
In fact, it's a circle de los muertos!

934
00:40:08,800 --> 00:40:10,800
Here it comes.

935
00:40:15,800 --> 00:40:18,800
I'll bet Jamie's just a little bit nervous right now.

936
00:40:18,800 --> 00:40:20,800
Oh, yeah!

937
00:40:20,800 --> 00:40:22,800
Watermelons are first on the menu!

938
00:40:22,800 --> 00:40:24,800
Holy crap!

939
00:40:24,800 --> 00:40:26,800
Something went flying!

940
00:40:26,800 --> 00:40:29,800
I think we had a total failure of the rig there.

941
00:40:29,800 --> 00:40:31,800
I think we had a total failure of the rig there.

942
00:40:31,800 --> 00:40:33,800
I think we had a total failure of the rig there.

943
00:40:33,800 --> 00:40:35,800
I think we had a total failure of the rig there.

944
00:40:35,800 --> 00:40:38,800
I think we had a total failure of the rig there.

945
00:40:39,800 --> 00:40:41,800
What just happened?

946
00:40:43,800 --> 00:40:45,800
What happened was scary as hell.

947
00:40:45,800 --> 00:40:47,800
The axle broke.

948
00:40:50,800 --> 00:40:51,800
Oh, yeah.

949
00:40:51,800 --> 00:40:53,800
Oh, dude, the axle sheared.

950
00:40:54,800 --> 00:40:56,800
Look at this.

951
00:40:58,800 --> 00:41:00,800
Oh, it went... oh, my gosh.

952
00:41:05,800 --> 00:41:07,800
Oh, there's your problem.

953
00:41:07,800 --> 00:41:09,800
Yeah.

954
00:41:09,800 --> 00:41:11,800
Oh, shoot.

955
00:41:11,800 --> 00:41:14,800
Well, that's the end of today's fun.

956
00:41:14,800 --> 00:41:17,800
Well, you know, I intended to go over the top

957
00:41:17,800 --> 00:41:19,800
with my lawnmower from hell.

958
00:41:19,800 --> 00:41:23,800
And I guess I did.

959
00:41:23,800 --> 00:41:25,800
Maybe a little too much, though.

960
00:41:25,800 --> 00:41:27,800
Maybe a little too much, though.

961
00:41:27,800 --> 00:41:29,800
Maybe a little too much, though.

962
00:41:29,800 --> 00:41:31,800
Maybe a little too much, though.

963
00:41:31,800 --> 00:41:33,800
Maybe a little too much, though.

964
00:41:33,800 --> 00:41:35,800
Maybe a little too much, though.

965
00:41:35,800 --> 00:41:38,800
Like we always say, failure is always an option.

966
00:41:43,800 --> 00:41:45,800
And, you know, this is the perfect example

967
00:41:45,800 --> 00:41:49,800
that you can learn as much from a failed test as a successful one.

968
00:41:49,800 --> 00:41:51,800
What we learned in this test is,

969
00:41:51,800 --> 00:41:54,800
well, that Jamie has built something far too dangerous

970
00:41:54,800 --> 00:41:56,800
to turn on again.

971
00:41:56,800 --> 00:41:58,800
He is literally sitting on a drivable,

972
00:41:58,800 --> 00:42:02,800
cutting, whirling, slicing blender of death.

973
00:42:04,800 --> 00:42:07,800
Well, we could put another blade on it, to be sure,

974
00:42:07,800 --> 00:42:09,800
but we're going to bow out for right now.

975
00:42:09,800 --> 00:42:12,800
At least until Jamie can figure out how to make this thing safe.

976
00:42:12,800 --> 00:42:14,800
Then we will be back.

977
00:42:14,800 --> 00:42:16,800
Yeah!