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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

46
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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

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and to clearly see what happens to those rocks.

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Our experimental design today is pretty straightforward.

52
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We are going to lay down these rocks.

53
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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 shot.

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Ha ha ha.

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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 Jamie was a kid didn't even have wheels.

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They had a really interesting name.

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I recall it was it.

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It was called the Mawar.

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It was called the Mawar.

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It was called the Mawar.

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They had a really interesting name.

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I recall it was it.

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Oh, goats.

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

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Modern metal mowers have to breed a flexion more than covered

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with this spring-loaded safety flout.

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Nothing came out. We got to pull that door.

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But Adam and Jamie want to know what happens

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in the worst-case scenario.

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It 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,

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remove this little door with a word danger on it.

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There we go. 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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Well, one thing's for certain.

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Unless you're wearing hockey armor,

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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. This is terrifying.

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I start out, I start the mower, 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 from this rain,

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this shower, this firestorm of little tiny bubbles

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that won't even flew up in the air and landed on my hat.

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And I can't even picture the physics required 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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I'm no expert with cameras, but that's bad. Am I right? 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. I apologize.

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I'll put that right there.

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A veritable firestorm of stones and ricochets meant no one was safe.

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Come here. 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 at bullet-like force

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is clearly on the right track.

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It threw this. This...

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That's heavy.

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With enough force to embed itself in this.

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

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I'm amazed.

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So, there's evidence the ballistic fallout is significant.

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But the Heinemann...

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Wee!

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Can't resist ramping it up.

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This thing here is, uh,

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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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Ha, ha, ha, ha!

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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 mowed.

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That mower moved them successfully off to the side with vigor.

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Ha, ha, ha!

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Turn it up! How'd I do?

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Um...

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Ha, ha, ha, ha!

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I'm going to go get a new mower.

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I'm going to get a new mower.

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I'm going to get a new mower.

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I'm going to get a new mower.

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Ha, ha, ha, ha!

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You know, I don't really care.

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Ha, ha, ha, ha!

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You might want to think twice before inviting a myth buster to mow your lawn.

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I'm just saying.

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Look, 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 at the speed of a bullet?

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Or were 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 and remove even more variables

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and hone in to find out if they really are kicking those rocks

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with the energy of a 357.

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The mower 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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It's Dangerous New Heights.

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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 those rocks are actually going.

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But before we get to that,

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what's if 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 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 cleave you right in twain.

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Well, I don't know about that,

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but whatever happens, it ain't going to be pretty.

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No.

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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 shock 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 flesh like a human.

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I'm going to melt down a clear flesh like material

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00:11:15,000 --> 00:11:18,000
and pour it into this human sized torso mold.

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00:11:18,000 --> 00:11:20,000
Yep, for anatomical accuracy,

194
00:11:23,000 --> 00:11:27,000
Jamie's using a creepy mix of realistic materials.

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00:11:27,000 --> 00:11:29,000
See the way that tears?

196
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This is a polyethylene material,

197
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and it actually rips,

198
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just like flesh will rip.

199
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So I'm going to use this as a filler material

200
00:11:40,000 --> 00:11:44,000
so that when our plastic dummy gets impacted,

201
00:11:44,000 --> 00:11:48,000
it actually cleaves if it's going to like flesh.

202
00:11:49,000 --> 00:11:53,000
Getting a human-like texture for their torso is critical.

203
00:11:53,000 --> 00:11:56,000
Adding bags of blood?

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00:11:56,000 --> 00:11:57,000
Not so much.

205
00:11:57,000 --> 00:12:00,000
These bags are made for what's known as sous vide.

206
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It's a method of cooking,

207
00:12:02,000 --> 00:12:06,000
and it means that the plastic's able to withstand a fair amount of heat,

208
00:12:06,000 --> 00:12:08,000
and this will provide a container for the blood,

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which when we float this or hang it inside our mold,

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hopefully if it gets hit with our class guillotine, it'll bleed.

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00:12:19,000 --> 00:12:22,000
With the gratuitously gory innards placed,

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00:12:22,000 --> 00:12:26,000
the pouring of the now superheated gel commences.

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00:12:26,000 --> 00:12:27,000
Lower down.

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00:12:27,000 --> 00:12:33,000
It's funny to go back through our whole entire history of human analogue production.

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00:12:33,000 --> 00:12:34,000
There we go.

216
00:12:34,000 --> 00:12:36,000
I mean, we started off so primitively,

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00:12:36,000 --> 00:12:39,000
just filling molds like this with dessert gelatin.

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00:12:39,000 --> 00:12:43,000
All the way up to, you know, last year we made a human analogue

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that would actually get hypothermia while you watch.

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00:12:46,000 --> 00:12:49,000
It's all looking good. It's nice and clear.

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00:12:49,000 --> 00:12:53,000
In this case, for our class guillotine, this one bleeds,

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00:12:53,000 --> 00:12:57,000
and in 12 hours when it cools, 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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00:13:00,000 --> 00:13:03,000
But their bubble is soon burst.

226
00:13:03,000 --> 00:13:06,000
That right there, that's a breach of one of our blood bags

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00:13:06,000 --> 00:13:08,000
inside our human analogue here.

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00:13:08,000 --> 00:13:12,000
It doesn't look like they've all breached, but if one has,

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well, there's only one of two reasons,

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00:13:14,000 --> 00:13:16,000
either because the bag wasn't properly constructed

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00:13:16,000 --> 00:13:18,000
or because they're all going to breach.

232
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What this means to the final product, I have no idea.

233
00:13:21,000 --> 00:13:24,000
We just got to wait till this cools and see what we get.

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00:13:29,000 --> 00:13:31,000
This is how Jamie was born.

235
00:13:34,000 --> 00:13:36,000
Ta-da!

236
00:13:36,000 --> 00:13:38,000
Hey!

237
00:13:38,000 --> 00:13:41,000
Oh, he looks a lot better than I was afraid he'd look.

238
00:13:43,000 --> 00:13:44,000
Yeah.

239
00:13:44,000 --> 00:13:46,000
Wow.

240
00:13:46,000 --> 00:13:49,000
I'd say it looks pretty usable.

241
00:13:49,000 --> 00:13:50,000
Nice!

242
00:13:50,000 --> 00:13:52,000
This is the first of our castings,

243
00:13:52,000 --> 00:13:55,000
and frankly, we were worried that we had ruined it,

244
00:13:55,000 --> 00:13:57,000
but while it's not perfect,

245
00:13:57,000 --> 00:14:00,000
hey, sorry, it's usable,

246
00:14:00,000 --> 00:14:02,000
and it'll serve for one of our tests.

247
00:14:03,000 --> 00:14:05,000
That's the deal.

248
00:14:05,000 --> 00:14:08,000
All of this is done in a way that we can do it,

249
00:14:08,000 --> 00:14:10,000
and that's a big challenge.

250
00:14:10,000 --> 00:14:12,000
Can we just build something like this?

251
00:14:12,000 --> 00:14:14,000
We can build a company,

252
00:14:14,000 --> 00:14:16,000
and we can do it.

253
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Clearly, if we're going to be experimenting

254
00:14:20,000 --> 00:14:22,000
with glass falling from great heights,

255
00:14:22,000 --> 00:14:25,000
we're going to need glass and we're going to need great height.

256
00:14:25,000 --> 00:14:26,000
Too low.

257
00:14:26,000 --> 00:14:29,000
Now, glass is easy, great heights, not so much.

258
00:14:29,000 --> 00:14:31,000
A little bit better.

259
00:14:31,000 --> 00:14:34,000
Today, I hate heights.

260
00:14:34,000 --> 00:14:36,000
We're gonna be dropping large panes of glass

261
00:14:36,000 --> 00:14:40,000
onto unwilling ballistics gelatin test subjects.

262
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Absolutely perfect.

263
00:14:44,000 --> 00:14:48,000
So we've got a 4-foot by 6-foot piece of 3-eighths inch thick glass,

264
00:14:48,000 --> 00:14:51,000
like what they would have on top of a high-rise.

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Not many people know this,

266
00:14:52,000 --> 00:14:55,000
but Mime's actually practiced behind an actual pane of glass.

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And I'm gonna hoist it to 75 feet.

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Good.

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We're Adam and I are gonna drop it.

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Looking good.

271
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Now, when you're visualizing a pane of glass falling

272
00:15:05,000 --> 00:15:08,000
and slicing through someone like a guillotine or a sword,

273
00:15:08,000 --> 00:15:11,000
you're probably thinking of something that looks a little like this.

274
00:15:14,000 --> 00:15:17,000
But you also probably were watching us move around our pane of glass

275
00:15:17,000 --> 00:15:19,000
and thinking, wait a minute, that glass doesn't look sharp.

276
00:15:19,000 --> 00:15:22,000
It looks like it's got a kind of a square edge, kind of like that.

277
00:15:22,000 --> 00:15:25,000
That's because the glass in an office building is called tempered glass.

278
00:15:25,000 --> 00:15:28,000
It's made to be very hard and it also doesn't break into shards.

279
00:15:28,000 --> 00:15:32,000
It actually breaks into many, many thousands of little tiny chunks,

280
00:15:32,000 --> 00:15:33,000
kind of like this.

281
00:15:34,000 --> 00:15:35,000
It didn't break.

282
00:15:36,000 --> 00:15:37,000
Let me just say this again.

283
00:15:37,000 --> 00:15:39,000
It breaks into many little pieces like this.

284
00:15:44,000 --> 00:15:45,000
There you go.

285
00:15:45,000 --> 00:15:48,000
So it's more akin to actually hitting the melon with the back of my blade

286
00:15:48,000 --> 00:15:50,000
rather than the front, like this.

287
00:15:53,000 --> 00:15:56,000
Now, is that what's gonna happen to our guy when our glass falls on him?

288
00:15:56,000 --> 00:15:59,000
Frankly, I have no idea. I'm just as curious as you are.

289
00:15:59,000 --> 00:16:00,000
All right.

290
00:16:01,000 --> 00:16:02,000
Nobody underneath this.

291
00:16:02,000 --> 00:16:04,000
Jamie, I will meet you up at the top.

292
00:16:07,000 --> 00:16:08,000
Here we go.

293
00:16:12,000 --> 00:16:14,000
I hate heights.

294
00:16:14,000 --> 00:16:17,000
I know nothing's gonna happen to me when I'm in these things.

295
00:16:17,000 --> 00:16:19,000
Man, this is scary.

296
00:16:19,000 --> 00:16:21,000
But I've always been that way.

297
00:16:21,000 --> 00:16:24,000
I just hate heights so intensely.

298
00:16:24,000 --> 00:16:26,000
It's just awful.

299
00:16:27,000 --> 00:16:29,000
Yeah, that's it.

300
00:16:29,000 --> 00:16:31,000
Jamie, this is working beautifully.

301
00:16:47,000 --> 00:16:50,000
You know, I can't help but feel like we're about to enact a scene in a movie

302
00:16:50,000 --> 00:16:52,000
called Clumsy Window Movers.

303
00:16:54,000 --> 00:16:58,000
For clarity, it is worth restating that what we are looking for from the glass here

304
00:16:58,000 --> 00:17:00,000
is not whether or not it kills him.

305
00:17:00,000 --> 00:17:04,000
Okay, now, I figure we hoisted over our heads.

306
00:17:04,000 --> 00:17:07,000
Yeah, although that would be the end result no matter what, if it hit him.

307
00:17:07,000 --> 00:17:08,000
Okay.

308
00:17:08,000 --> 00:17:09,000
Three.

309
00:17:09,000 --> 00:17:10,000
Oh my God.

310
00:17:10,000 --> 00:17:15,000
It's that it would cleave him in two like my sword did with the melon.

311
00:17:15,000 --> 00:17:16,000
Sheen.

312
00:17:16,000 --> 00:17:19,000
Three, two, one.

313
00:17:24,000 --> 00:17:26,000
Oh.

314
00:17:26,000 --> 00:17:29,000
It did a little turn right at the very end.

315
00:17:29,000 --> 00:17:33,000
It looked like it was gonna be perfect and at the very end at fish tail.

316
00:17:33,000 --> 00:17:35,000
Oh my gosh.

317
00:17:35,000 --> 00:17:37,000
It was so close.

318
00:17:37,000 --> 00:17:42,000
For like the first couple of seconds, it seemed to be falling perfectly like a knife towards him.

319
00:17:42,000 --> 00:17:44,000
I'm like, oh my God, it's gonna hit him.

320
00:17:44,000 --> 00:17:45,000
It's gonna hit him.

321
00:17:45,000 --> 00:17:50,000
And then what feels like just before it got to our dude and went like this

322
00:17:50,000 --> 00:17:56,000
and hit the ground perfectly flat and spread in every direction.

323
00:17:56,000 --> 00:17:58,000
Oh my goodness.

324
00:17:58,000 --> 00:18:01,000
It looks worse down here than it did up there.

325
00:18:01,000 --> 00:18:04,000
Oh my God, it's so pretty.

326
00:18:04,000 --> 00:18:10,000
When I was like 10, I would have taken these home and pretended they were diamonds and pretended I had treasure.

327
00:18:10,000 --> 00:18:14,000
I would have sold them to the neighborhood kids and made a profit.

328
00:18:14,000 --> 00:18:18,000
It's clear that this test was a fling and a miss.

329
00:18:18,000 --> 00:18:23,000
To stand a chance of a direct hit split, they're gonna need a plan B.

330
00:18:23,000 --> 00:18:24,000
What do you think?

331
00:18:24,000 --> 00:18:26,000
Should we head back to the shop and make a system for guiding the glass?

332
00:18:26,000 --> 00:18:28,000
Yeah, I've got some ideas.

333
00:18:28,000 --> 00:18:30,000
Me too.

334
00:18:37,000 --> 00:18:43,000
Lurking innocently in your garden shed, a lethal accident is waiting to happen.

335
00:18:43,000 --> 00:18:45,000
Or is it?

336
00:18:46,000 --> 00:18:53,000
We have been trying to determine whether a lawnmower can fling rocks with the same amount of energy as a bullet.

337
00:18:53,000 --> 00:18:57,000
What we'd like to do is measure the speed at which the rocks are leaving the lawnmower

338
00:18:57,000 --> 00:19:03,000
and then see how that compares to the speed of an actual bullet.

339
00:19:03,000 --> 00:19:07,000
Before comparing actual bullets, they're measuring the mower.

340
00:19:07,000 --> 00:19:09,000
Why am I taking the motor off?

341
00:19:09,000 --> 00:19:15,000
Well, for us to test it in the shop, we need to look closely at it and run it for a while.

342
00:19:15,000 --> 00:19:20,000
And so instead of having this noisy, smelly, gasoline engine going in here,

343
00:19:20,000 --> 00:19:25,000
we're just gonna swap it out with an electric motor, nice and clean and quiet.

344
00:19:28,000 --> 00:19:30,000
This thing's stuck.

345
00:19:30,000 --> 00:19:39,000
And we got it.

346
00:19:39,000 --> 00:19:45,000
The way this motor is wound, it's gonna give us 100 rpm for every bolt that it sees.

347
00:19:45,000 --> 00:19:54,000
And so given that the gas engine ran at 3600 rpm, we need to feed this 36 volts to see the same rpm.

348
00:19:54,000 --> 00:20:02,000
But the thing is, if we give it that voltage all at once, it's gonna spin that blade up to full rpm in like a millisecond.

349
00:20:02,000 --> 00:20:08,000
It's, it's, it's, you just build a lawnmower that I want to be behind a blast shield in order to start.

350
00:20:08,000 --> 00:20:14,000
And that's scary. It might end up putting the blade in the wall or in me or something,

351
00:20:14,000 --> 00:20:19,000
because something's gonna break. So I've got to figure out a way of doing it a little more gently.

352
00:20:19,000 --> 00:20:26,000
To gently deliver that power, once again, Jamie uses equipment in ways for which it was never intended.

353
00:20:26,000 --> 00:20:28,000
This is working perfectly.

354
00:20:28,000 --> 00:20:32,000
He's hooked up a DC-powered welding machine to a lawnmower.

355
00:20:32,000 --> 00:20:41,000
I love it when things actually work the way you hope. I mean, it is somehow a little counterintuitive to run a motor off of a welder,

356
00:20:41,000 --> 00:20:43,000
but DC power is DC power.

357
00:20:43,000 --> 00:20:46,000
That's amazing. All right, let's get it up on a stand.

358
00:20:50,000 --> 00:20:56,000
We need to be able to deliver the rock to the spinning blade in a way that we can actually see what's going on.

359
00:20:56,000 --> 00:20:58,000
Now it's looking like something.

360
00:20:58,000 --> 00:21:06,000
But Adam and I have come up with a way of doing it, which involves putting the whole mower up on top of a sheet of clear acrylic,

361
00:21:06,000 --> 00:21:08,000
and then we can see from underneath.

362
00:21:08,000 --> 00:21:16,000
Yet another in a long line of pristine surfaces soon to be destroyed and sullied in our hunt for the truth.

363
00:21:16,000 --> 00:21:23,000
And we'll simply raise the mower, get the mower up to speed, and then lower it down onto the rock.

364
00:21:23,000 --> 00:21:24,000
Bang.

365
00:21:24,000 --> 00:21:27,000
So how are we going to keep this stuff from going all over the shop?

366
00:21:27,000 --> 00:21:33,000
Well, we've cut away the whole side here, so we wanted to go there, so I thought we'd put some upright supply wood here to protect the walls.

367
00:21:33,000 --> 00:21:37,000
We already know that a lawnmower can curl a rock at a fairly good speed.

368
00:21:38,000 --> 00:21:41,000
We don't know what that speed is.

369
00:21:41,000 --> 00:21:42,000
Cool. All right.

370
00:21:42,000 --> 00:21:45,000
That's position one, medium-sized rock.

371
00:21:45,000 --> 00:21:47,000
So we're going to power up this lawnmower to its full speed.

372
00:21:47,000 --> 00:21:54,000
We're going to feed rocks into it, watch them on our high-speed camera, and measure exactly how fast they leave.

373
00:21:54,000 --> 00:21:55,000
You ready?

374
00:21:55,000 --> 00:21:56,000
I'm ready.

375
00:21:56,000 --> 00:21:57,000
Let's do this.

376
00:21:59,000 --> 00:22:06,000
18, 25, 32.

377
00:22:09,000 --> 00:22:11,000
34.

378
00:22:12,000 --> 00:22:13,000
Speed.

379
00:22:13,000 --> 00:22:15,000
All right. Here we go.

380
00:22:15,000 --> 00:22:17,000
Dropping a lawnmower onto a rock.

381
00:22:17,000 --> 00:22:19,000
Three, two, one.

382
00:22:21,000 --> 00:22:22,000
Cut it.

383
00:22:22,000 --> 00:22:24,000
Blink, and it's gone.

384
00:22:26,000 --> 00:22:31,000
Because when the mower is lowered, the blade instantly slices the stone into chunks.

385
00:22:32,000 --> 00:22:36,000
Oh, wow. Just absolutely decimated that piece.

386
00:22:36,000 --> 00:22:41,000
Question is, were any of the fragments moving at a bullet-like velocity?

387
00:22:41,000 --> 00:22:49,000
The fastest chunk was going 250 feet per second, and that's actually pretty significant for a chunk of rock about one inch long and a half inch wide.

388
00:22:49,000 --> 00:22:53,000
But we're going to keep running this, see if we can't find even faster debris.

389
00:22:54,000 --> 00:22:57,000
250 feet per second is a good start.

390
00:22:57,000 --> 00:22:59,000
Okay, sir. We got a whole pile going in.

391
00:22:59,000 --> 00:23:03,000
But this time, they're giving their mower more to aim for.

392
00:23:03,000 --> 00:23:04,000
Start her up.

393
00:23:04,000 --> 00:23:06,000
What could possibly go wrong?

394
00:23:08,000 --> 00:23:09,000
Speed.

395
00:23:11,000 --> 00:23:13,000
Dropping big pile of rocks.

396
00:23:13,000 --> 00:23:14,000
Cover your eyes.

397
00:23:14,000 --> 00:23:15,000
Three, two, one.

398
00:23:20,000 --> 00:23:21,000
Cut it.

399
00:23:22,000 --> 00:23:23,000
Everybody okay?

400
00:23:25,000 --> 00:23:26,000
Chunk.

401
00:23:29,000 --> 00:23:31,000
Chunk made it out.

402
00:23:31,000 --> 00:23:35,000
I hope we got the shot because that was the sound of the blade coming off of the motor.

403
00:23:35,000 --> 00:23:36,000
Oh, really?

404
00:23:36,000 --> 00:23:37,000
Yeah.

405
00:23:38,000 --> 00:23:41,000
While Jamie inspects the carnage.

406
00:23:41,000 --> 00:23:42,000
Wow.

407
00:23:42,000 --> 00:23:46,000
We cracked our acrylic bottom.

408
00:23:46,000 --> 00:23:48,000
Adam, ignoring the mess he's made.

409
00:23:48,000 --> 00:23:49,000
Here's the blade.

410
00:23:49,000 --> 00:23:50,000
Cues up the high speed.

411
00:23:50,000 --> 00:23:52,000
Wow, dude.

412
00:23:52,000 --> 00:23:54,000
We got the hit that I was hoping to get.

413
00:23:56,000 --> 00:23:58,000
Watch the leading edge of the blade here.

414
00:23:58,000 --> 00:23:59,000
Boom.

415
00:23:59,000 --> 00:24:00,000
That piece.

416
00:24:00,000 --> 00:24:02,000
400 feet per second.

417
00:24:02,000 --> 00:24:05,000
272 miles per hour.

418
00:24:05,000 --> 00:24:06,000
Well.

419
00:24:07,000 --> 00:24:10,000
I feel like we're in some very dangerous territory.

420
00:24:10,000 --> 00:24:11,000
Dangerous for sure.

421
00:24:11,000 --> 00:24:16,000
But the crucial question is, how does it compare to the speed of a bullet?

422
00:24:17,000 --> 00:24:23,000
Well, Jamie, with high speed camera in tow, fired up at the gun range.

423
00:24:26,000 --> 00:24:27,000
Define that.

424
00:24:27,000 --> 00:24:30,000
Three, two, one.

425
00:24:31,000 --> 00:24:35,000
The slowest bullet we measured went at 1,000 feet per second.

426
00:24:35,000 --> 00:24:40,000
The 357, which was much faster, went at 1,400 feet per second.

427
00:24:40,000 --> 00:24:48,000
Now, the fastest rock we got off of our lawnmower went 400 feet per second, which is nowhere close.

428
00:24:48,000 --> 00:24:50,000
But it's not busted right there.

429
00:24:50,000 --> 00:24:51,000
No, no, no, no.

430
00:24:51,000 --> 00:24:55,000
Because while this rock is bigger and slower than this bullet, it's heavier.

431
00:24:55,000 --> 00:25:02,000
What I'm wondering now is, is there a rig I can build that can compare the amount of energy the bullet brings to the equation

432
00:25:02,000 --> 00:25:05,000
and compare it to the amount of energy the rock brings?

433
00:25:06,000 --> 00:25:07,000
I think I can.

434
00:25:07,000 --> 00:25:09,000
Three, two, one.

435
00:25:09,000 --> 00:25:18,000
While Adam cogitates on how to illustrate energy comparison, he's thinking outside the box for glass guillotine.

436
00:25:19,000 --> 00:25:24,000
Clearly dropping glass off the building isn't going to be a repeatable way for us to test this story.

437
00:25:24,000 --> 00:25:25,000
Oh!

438
00:25:25,000 --> 00:25:30,000
So we're going to need to come up with a mechanism for reliably making the glass hit exactly where we want.

439
00:25:30,000 --> 00:25:35,000
And I have an idea, except in order to talk about it, I want to build a little model of the fire training tower.

440
00:25:35,000 --> 00:25:39,000
And instead of an exotic material, I love making corners match up.

441
00:25:39,000 --> 00:25:42,000
I'm just going to use this cardboard box we just got in the mail.

442
00:25:42,000 --> 00:25:43,000
Ta-da!

443
00:25:43,000 --> 00:25:46,000
I know it doesn't look like much, but check this out.

444
00:25:46,000 --> 00:25:51,000
This coat hanger will be a welded steel rack which we sit on the lip of the building.

445
00:25:51,000 --> 00:25:52,000
You are clear.

446
00:25:52,000 --> 00:25:57,000
These red pieces of parachute cord are guide wires which we mount to the ground.

447
00:25:57,000 --> 00:25:58,000
Awesome.

448
00:25:58,000 --> 00:26:03,000
The glass has riders on it that keep it aligned with the guide wires.

449
00:26:03,000 --> 00:26:07,000
They say the glass is tempered, but is it bad tempered?

450
00:26:07,000 --> 00:26:09,000
We bring it up with a winch.

451
00:26:09,000 --> 00:26:11,000
Go ahead and winch up the glass.

452
00:26:11,000 --> 00:26:13,000
Oh, here she comes.

453
00:26:13,000 --> 00:26:15,000
Drop it from the top and...

454
00:26:15,000 --> 00:26:17,000
Think!

455
00:26:17,000 --> 00:26:23,000
It hits our test subject square where we want him to and slices him right in half.

456
00:26:23,000 --> 00:26:24,000
Or not.

457
00:26:24,000 --> 00:26:26,000
That's what we're going to find out.

458
00:26:28,000 --> 00:26:35,000
And with Adam's model design rigged, the glass is poised to come crashing down in controlled fashion.

459
00:26:35,000 --> 00:26:38,000
It is really just about to happen.

460
00:26:38,000 --> 00:26:40,000
I can't wait to see this.

461
00:26:40,000 --> 00:26:46,000
It's time to find out if our unsuspecting bystander will be neatly split in two.

462
00:26:46,000 --> 00:26:51,000
In three, two, one.

463
00:26:51,000 --> 00:26:54,000
Here it comes.

464
00:26:54,000 --> 00:26:59,000
That was perfect.

465
00:26:59,000 --> 00:27:02,000
Dude, that was beautiful.

466
00:27:02,000 --> 00:27:04,000
He's still in one piece.

467
00:27:04,000 --> 00:27:06,000
It looks like he's still in one piece.

468
00:27:06,000 --> 00:27:07,000
Of course.

469
00:27:07,000 --> 00:27:10,000
There's blood everywhere.

470
00:27:14,000 --> 00:27:16,000
Well, every one of our methodologies worked beautifully.

471
00:27:16,000 --> 00:27:20,000
The glass dropped, it hit our dude exactly where we wanted it to,

472
00:27:20,000 --> 00:27:23,000
and it did not leave him in twain.

473
00:27:23,000 --> 00:27:27,000
No, it merely became a piece of glass.

474
00:27:27,000 --> 00:27:32,000
But there's still only one dude. There's not two half dudes.

475
00:27:32,000 --> 00:27:34,000
I've got to try something else.

476
00:27:36,000 --> 00:27:42,000
Yep, this slasher story is about to get real edgy.

477
00:27:57,000 --> 00:28:06,000
Could a one in a million high-rise slip ever really slice you in half?

478
00:28:06,000 --> 00:28:09,000
Not according to the evidence so far.

479
00:28:09,000 --> 00:28:12,000
And you might be watching thinking, of course it didn't you, idiot.

480
00:28:12,000 --> 00:28:15,000
It's that tempered glass you dropped, had this big square edge on it.

481
00:28:15,000 --> 00:28:17,000
But that's the thing with tempered glass.

482
00:28:17,000 --> 00:28:19,000
It doesn't break and have sharp edges.

483
00:28:19,000 --> 00:28:22,000
For that, you've got to move to plate glass.

484
00:28:22,000 --> 00:28:26,000
Now, they don't use plate glass in office buildings specifically for this reason,

485
00:28:26,000 --> 00:28:29,000
but for due diligence, we've got a piece of plate glass here.

486
00:28:29,000 --> 00:28:36,000
And we're going to break this so that we get a nice, clean, broken edge of plate glass.

487
00:28:36,000 --> 00:28:38,000
All right.

488
00:28:38,000 --> 00:28:42,000
And we're going to drop that on the next unsuspecting bystander we pulled out of our mold.

489
00:28:42,000 --> 00:28:44,000
Okay, I'm going to move them in.

490
00:28:44,000 --> 00:28:45,000
Yep.

491
00:28:45,000 --> 00:28:48,000
Our next victim doesn't have blood bags.

492
00:28:48,000 --> 00:28:50,000
That is right down the center.

493
00:28:50,000 --> 00:28:55,000
Not quite as much fun, but a little bit more consistent as far as the physics.

494
00:28:55,000 --> 00:28:59,000
Go ahead and raise him in three, two, one, go.

495
00:28:59,000 --> 00:29:05,000
While it's on its way up, I feel confident that I think that that is going to slice our dude in half.

496
00:29:05,000 --> 00:29:08,000
The edges of that glass, they're really sharp.

497
00:29:08,000 --> 00:29:10,000
It's going to be a hard shot.

498
00:29:12,000 --> 00:29:15,000
All right, go ahead and count it down and let it go.

499
00:29:15,000 --> 00:29:23,000
And three, two, one.

500
00:29:23,000 --> 00:29:24,000
Here it comes.

501
00:29:24,000 --> 00:29:26,000
Oh, it's good. It's good.

502
00:29:35,000 --> 00:29:37,000
That was beautiful.

503
00:29:37,000 --> 00:29:40,000
I mean, I don't know how well it worked, but it looked great.

504
00:29:40,000 --> 00:29:56,000
Dude, that would be cleaved as I've been saying all that episode long in twain.

505
00:29:56,000 --> 00:30:02,000
Not exactly a bullseye to the brain, but in twain he truly is.

506
00:30:02,000 --> 00:30:07,000
I couldn't see that chunk fly off of him from where I was standing.

507
00:30:07,000 --> 00:30:12,000
It looked like unfettered destruction, but dude, that is, that's amazing.

508
00:30:12,000 --> 00:30:15,000
These two dummies tell the whole story.

509
00:30:15,000 --> 00:30:22,000
The first one we dropped a piece of temperate glass onto, and they manufacture that glass so that people don't get cut.

510
00:30:22,000 --> 00:30:24,000
And the result is appropriate to that.

511
00:30:24,000 --> 00:30:31,000
Our guy would have had his skull crushed with a lot of bones broken, but he wouldn't have been cleaved in half.

512
00:30:31,000 --> 00:30:36,000
The other one we dropped a piece of plate glass on that had a broken edge that was very sharp.

513
00:30:36,000 --> 00:30:40,000
And as a result, he got cut cleanly in half.

514
00:30:40,000 --> 00:30:44,000
The end result is the same. You would have died.

515
00:30:44,000 --> 00:30:46,000
Take your pick.

516
00:30:46,000 --> 00:30:49,000
Can glass falling from a high rise cut you in two?

517
00:30:49,000 --> 00:30:52,000
This is an interesting one because it's kind of a yes or no situation.

518
00:30:52,000 --> 00:30:57,000
If it's the glass they make high rises from, then no, it's not going to cut you in two.

519
00:30:57,000 --> 00:31:00,000
It's going to kill you, but it's not going to leave you in two parts.

520
00:31:00,000 --> 00:31:06,000
But if it's the wrong kind of glass, then absolutely it can leave you in two big chunks.

521
00:31:06,000 --> 00:31:10,000
So right kind is busted, but wrong kind is plausible.

522
00:31:10,000 --> 00:31:12,000
Bless a plausible.

523
00:31:12,000 --> 00:31:13,000
Alright, I'll buy that.

524
00:31:13,000 --> 00:31:14,000
Alright, let's get out of here.

525
00:31:24,000 --> 00:31:26,000
Back on the trail of the stone cold killer.

526
00:31:27,000 --> 00:31:33,000
Adam and Jamie have proven a rock from a mower does not travel as fast as a bullet,

527
00:31:33,000 --> 00:31:37,000
but speed is not the only vicious vector.

528
00:31:37,000 --> 00:31:41,000
So we are looking to compare the amount of energy generated from an impact with a bullet

529
00:31:41,000 --> 00:31:45,000
with the energy generated from the impact with a rock.

530
00:31:45,000 --> 00:31:49,000
So imagine that this hammer can swing like a pendulum.

531
00:31:49,000 --> 00:31:52,000
Then let's take a gun and shoot the face of this hammer.

532
00:31:52,000 --> 00:31:53,000
What's going to happen?

533
00:31:53,000 --> 00:31:56,000
It's an indicator of how much energy the bullet brings to the equation.

534
00:31:56,000 --> 00:32:01,000
Now if I fire a stone at the same hammer at this speed it would be kicked by a lawn mower

535
00:32:01,000 --> 00:32:07,000
and the hammer moves the same amount, well then we could conclude that the amount of energy

536
00:32:07,000 --> 00:32:11,000
being brought to the equation by the bullet is the same as the stone.

537
00:32:11,000 --> 00:32:13,000
That's the theory anyway.

538
00:32:13,000 --> 00:32:15,000
Let's see if it works.

539
00:32:15,000 --> 00:32:19,000
Yep, the heavy stone may have been moving more slowly than the lighter bullet.

540
00:32:22,000 --> 00:32:23,000
That's beautiful.

541
00:32:23,000 --> 00:32:28,000
But this pendulum rig will illustrate and compare the energy of each.

542
00:32:29,000 --> 00:32:34,000
Its acrylic impact pad will efficiently transfer the energy of the bullet to the pendulum

543
00:32:34,000 --> 00:32:37,000
and can be replaced for each test.

544
00:32:38,000 --> 00:32:40,000
Well that looks nifty.

545
00:32:40,000 --> 00:32:44,000
With the rig ready to swing, the first test will be to measure the bullet's impact.

546
00:32:44,000 --> 00:32:45,000
Okay.

547
00:32:45,000 --> 00:32:48,000
And for that, it's back down to the gun range.

548
00:32:51,000 --> 00:32:52,000
Gun is hot.

549
00:32:53,000 --> 00:32:56,000
Alright, 357 on your mark.

550
00:32:56,000 --> 00:32:57,000
Okay, here we go.

551
00:32:57,000 --> 00:32:59,000
Hopefully this doesn't wreck the rig.

552
00:32:59,000 --> 00:33:03,000
And three, two, one.

553
00:33:06,000 --> 00:33:10,000
The pendulum peaked at 60 degrees, but working on the basis that

554
00:33:10,000 --> 00:33:12,000
If it ain't repeatable, it ain't science.

555
00:33:12,000 --> 00:33:14,000
The guys go again.

556
00:33:15,000 --> 00:33:18,000
And three, two, one.

557
00:33:21,000 --> 00:33:22,000
Nice.

558
00:33:22,000 --> 00:33:24,000
It looked pretty consistent.

559
00:33:25,000 --> 00:33:28,000
We did our two tests with 357 and they were consistent.

560
00:33:28,000 --> 00:33:30,000
They were about 60 degrees.

561
00:33:30,000 --> 00:33:35,000
So we've got the data we need to move on to stones out of the lawnmower.

562
00:33:35,000 --> 00:33:45,000
But if you thought that means no more guns, then think again.

563
00:33:52,000 --> 00:33:53,000
Wow.

564
00:33:55,000 --> 00:34:01,000
Because stones from the lawnmower are hard to aim, because Adam's pendulum target is very small.

565
00:34:01,000 --> 00:34:06,000
We're going to take the lawnmower out of the equation and use a pneumatic launcher instead.

566
00:34:07,000 --> 00:34:11,000
I'm going to first check to see that it's shooting the rocket at the correct speed.

567
00:34:11,000 --> 00:34:12,000
406.

568
00:34:12,000 --> 00:34:13,000
Seriously?

569
00:34:14,000 --> 00:34:16,000
Awesome. Let's bring it in and shoot this thing.

570
00:34:16,000 --> 00:34:21,000
And then we're going to bring in Adam's energy rig, hit it with a rock shot at 400 feet per second,

571
00:34:21,000 --> 00:34:24,000
and see how far a pendulum goes.

572
00:34:24,000 --> 00:34:25,000
This is it.

573
00:34:25,000 --> 00:34:26,000
Good to go.

574
00:34:26,000 --> 00:34:28,000
And his safety's off.

575
00:34:28,000 --> 00:34:39,000
Will a stone the same mass and velocity as the fastest speed test stone match the energy of the lighter lethal bullet?

576
00:34:46,000 --> 00:34:51,000
Dude, we got to see the video, but I swear that went past 60 degrees.

577
00:34:52,000 --> 00:34:57,000
With the crucial shot queued up, did the rock hit the right angle?

578
00:34:57,000 --> 00:34:59,000
Let's see how high it actually went.

579
00:35:00,000 --> 00:35:04,000
Wait. Oh my gosh. Dude! Dude!

580
00:35:04,000 --> 00:35:06,000
It went above the 357.

581
00:35:06,000 --> 00:35:09,000
That's 66 degrees.

582
00:35:11,000 --> 00:35:13,000
That is more energy from the rock.

583
00:35:14,000 --> 00:35:17,000
I'm sorry I'm yelling, but I totally didn't expect this result.

584
00:35:17,000 --> 00:35:21,000
That is more energy from the rock than from a bullet from a 357.

585
00:35:21,000 --> 00:35:23,000
That is amazing.

586
00:35:24,000 --> 00:35:25,000
Shocking.

587
00:35:25,000 --> 00:35:27,000
Totally awesome.

588
00:35:27,000 --> 00:35:31,000
I have been expressing my doubts about confirming this story.

589
00:35:31,000 --> 00:35:38,000
Since the beginning, I just never thought the rock was going to have anywhere close to the amount of energy of a 357 bullet,

590
00:35:38,000 --> 00:35:41,000
and yet it exceeded it.

591
00:35:41,000 --> 00:35:44,000
That, I knew lawnmowers were scary.

592
00:35:44,000 --> 00:35:46,000
I just didn't know how scary.

593
00:35:46,000 --> 00:35:51,000
So with everything that we tested, I think we have definitively proven, and frankly I'm astonished by this,

594
00:35:51,000 --> 00:35:57,000
but that a rock thrown from a lawnmower can possibly have as much or more power than a bullet from a 357.

595
00:35:59,000 --> 00:36:01,000
I'm astonished, but this one's confirmed.

596
00:36:01,000 --> 00:36:03,000
Yeah, I was surprised too.

597
00:36:03,000 --> 00:36:06,000
But you know that gave me an idea.

598
00:36:06,000 --> 00:36:07,000
What?

599
00:36:07,000 --> 00:36:11,000
I want to make the lawnmower from hell.

600
00:36:13,000 --> 00:36:16,000
You do that, I'm going to go home and hide.

601
00:36:21,000 --> 00:36:23,000
Yeah!

602
00:36:29,000 --> 00:36:33,000
With typical enthusiasm for engineering extremes,

603
00:36:33,000 --> 00:36:41,000
the Heinemann's going all out to turn a dream domestic mower into a deadly weaponized nightmare.

604
00:36:41,000 --> 00:36:44,000
And the key to his hellish vision...

605
00:36:44,000 --> 00:36:45,000
That's going to be sweet.

606
00:36:45,000 --> 00:36:48,000
...is to load up with a whole load more power.

607
00:36:48,000 --> 00:36:51,000
Oh my god, that's one big battery.

608
00:36:51,000 --> 00:36:57,000
What this is, is a bank of about 90 volts at about 1800 amps.

609
00:36:57,000 --> 00:37:04,000
That means that shorting some of these would pretty much be like setting off a stick of dynamite.

610
00:37:09,000 --> 00:37:12,000
What are we doing back here at the Chabot gun range?

611
00:37:12,000 --> 00:37:16,000
Well, remember that we have absolutely determined that a lawnmower can curl a rod

612
00:37:16,000 --> 00:37:21,000
with the same amount or greater force than a bullet from a 357.

613
00:37:21,000 --> 00:37:25,000
That means that a lawnmower can be weaponized and that fact...

614
00:37:26,000 --> 00:37:29,000
Well, let's just say that fact was too tempting for Jamie.

615
00:37:29,000 --> 00:37:34,000
When it comes to terrifying engineering and gratuitous ramping up,

616
00:37:34,000 --> 00:37:37,000
the Heinemann has history.

617
00:37:37,000 --> 00:37:39,000
I call it my little pop gun.

618
00:37:39,000 --> 00:37:44,000
When he decides to go over the top, it's a good idea to duck, cover,

619
00:37:44,000 --> 00:37:48,000
and wear a hard hat at a safe distance.

620
00:38:00,000 --> 00:38:03,000
Introducing the lawnmower from hell.

621
00:38:03,000 --> 00:38:06,000
You've got 200 horsepower of electric car motors,

622
00:38:06,000 --> 00:38:10,000
1800 amps of lithium batteries.

623
00:38:10,000 --> 00:38:17,000
They'll be spinning a 50-pound tool steel blade at upwards of 5,000 RPM.

624
00:38:17,000 --> 00:38:22,000
Put it all together and you really don't want to try this at home.

625
00:38:26,000 --> 00:38:29,000
First up, we're going to get the beast here a little taste.

626
00:38:29,000 --> 00:38:31,000
Just a little taste.

627
00:38:31,000 --> 00:38:33,000
It's a bucket of blue water.

628
00:38:33,000 --> 00:38:35,000
Go for it.

629
00:38:36,000 --> 00:38:47,000
Oh, I've barely been so happy to be behind the bulletproof shields.

630
00:38:51,000 --> 00:38:52,000
He's approaching.

631
00:38:52,000 --> 00:38:57,000
Six feet, four feet, two feet, it goes!

632
00:39:06,000 --> 00:39:16,000
Dude, that was beautiful.

633
00:39:16,000 --> 00:39:19,000
Tell you what, why don't you take this thing around the corner?

634
00:39:19,000 --> 00:39:24,000
I'll set up a really fun course for you to implement as much destruction as possible.

635
00:39:24,000 --> 00:39:25,000
I'll let you know when we're ready for you.

636
00:39:25,000 --> 00:39:27,000
Okay.

637
00:39:27,000 --> 00:39:32,000
So how do you put ridiculously souped up and almost definitely dangerous lawnmower through its paces?

638
00:39:32,000 --> 00:39:36,000
I decided on a broad range of material.

639
00:39:36,000 --> 00:39:38,000
Now we're getting serious.

640
00:39:38,000 --> 00:39:43,000
I wanted some small hard things to get that bullet-like carnage like a frat house lawn.

641
00:39:43,000 --> 00:39:47,000
And I wanted some big things to get some awesome high-speed camera carnage.

642
00:39:47,000 --> 00:39:51,000
I call this section the pallet cleanser.

643
00:39:51,000 --> 00:39:53,000
My prediction?

644
00:39:53,000 --> 00:39:55,000
Got to have some willing victims.

645
00:39:55,000 --> 00:39:57,000
Frankly, I just hope no one gets hurt.

646
00:39:57,000 --> 00:40:01,000
Last one, like some sort of kumbaya dance circle.

647
00:40:01,000 --> 00:40:05,000
In fact, it's a circle de los muertos.

648
00:40:16,000 --> 00:40:17,000
Here it comes.

649
00:40:21,000 --> 00:40:24,000
I bet Jamie's just a little bit nervous right now.

650
00:40:25,000 --> 00:40:28,000
Oh yeah, watermelons are first on the menu.

651
00:40:31,000 --> 00:40:34,000
Holy crap, something went flying!

652
00:40:36,000 --> 00:40:39,000
I think we had a total failure of the rig there.

653
00:40:40,000 --> 00:40:42,000
What just happened?

654
00:40:44,000 --> 00:40:47,000
What happened was scary as hell.

655
00:40:47,000 --> 00:40:49,000
The axle broke.

656
00:40:51,000 --> 00:40:52,000
Oh yeah.

657
00:40:52,000 --> 00:40:54,000
Oh dude, the axle sheared.

658
00:40:55,000 --> 00:40:57,000
Look at this.

659
00:40:58,000 --> 00:41:00,000
Oh my gosh.

660
00:41:12,000 --> 00:41:14,000
Well there's your problem.

661
00:41:16,000 --> 00:41:17,000
Oh shoot.

662
00:41:18,000 --> 00:41:21,000
Well, that's the end of today's fun.

663
00:41:21,000 --> 00:41:26,000
Well, you know, I intended to go over the top with my lawnmower from hell.

664
00:41:27,000 --> 00:41:30,000
And I guess I did.

665
00:41:33,000 --> 00:41:35,000
Maybe a little too much though.

666
00:41:37,000 --> 00:41:40,000
Like we always say, failure is always an option.

667
00:41:44,000 --> 00:41:50,000
And you know, this is the perfect example that you can learn as much from a failed test as a successful one.

668
00:41:50,000 --> 00:41:56,000
What we learned in this test is, well that Jamie has built something far too dangerous to turn on again.

669
00:41:56,000 --> 00:42:03,000
He is literally sitting on a drivable, cutting, whirling, slicing blender of death.

670
00:42:06,000 --> 00:42:10,000
Well we could put another blade on it to be sure, but we're gonna bow out for right now.

671
00:42:10,000 --> 00:42:13,000
At least until Jamie can figure out how to make this thing safe.

672
00:42:13,000 --> 00:42:15,000
Then we will be back.

673
00:42:26,000 --> 00:42:28,000
Thanks for watching.