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On this episode of MythBusters, Adam and Jamie are taking silver screen sounds to task.

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We want to see whether these things make the same sounds in real life that they do in the movies.

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Bye bye!

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Yep, are those audio cliches, fact or fake?

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Meanwhile, Carrie Grant and Tori cast off for science.

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This is blow your own sail with a full-size boat.

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They're testing the physics thought experiment.

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Is it possible to blow your own sail?

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Come on!

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Chaos mayhem, I see hijinks, ahoy!

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I feel like there might be just a little element of danger here.

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Who are the MythBusters?

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Adam Savage.

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I'm done with science for today.

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And Jamie Heidemann.

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Way to go there, buddy.

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Between them more than 30 years of special effects experience.

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Joining them, Grant Imahara.

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That's why we can never have anything nice.

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Tori Bellachy.

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I'll try to let you guys down.

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And Carrie Byron.

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Oh!

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I went to college for this.

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They don't just tell the Myths, they put them to the test.

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First off, an audio myth that Adam's having nightmares over.

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Look at that.

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Somebody's left me a present.

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Beautiful.

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Looks like I'm gonna have to take care of this myself.

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Ah!

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Bye-bye.

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What was that?

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That was our next story.

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Really?

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Because it looked to me like you were trying to kill me.

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No, no, no.

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It sounds like I'm trying to kill you.

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I don't get it.

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Well, our next story is about whether the sounds you hear in the movies are accurate to the real world.

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Sounds cool!

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Yup, the sounds of Hollywood are being put under the Mythbusters microscope.

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To give a story suspense, add dramatic punch, or even a real one.

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Movie makers manipulate, massage, and enrich every single sound effect we hear.

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But do these audio cliches care any resemblance to the real thing?

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To find out, Adam and Jamie have got their ears to the sound.

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Alright, so if memory serves, the classic movie sound effects we'll be working with are things like the punch, the silent serves, and explosions.

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In any others we run into along the way.

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Alright, and the testing seems to be pretty straightforward.

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We punch something, we use the sounds here, we blow something up, and we record those sounds and compare them to what the movies generally represent as those sounds.

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Let's start with the punch.

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Okay.

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Fear not, Adam, there'll be no sobering sequel.

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Instead, Jamie's reprising the violence of the hams.

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I always like to wear rain gear when I carry around my pigs.

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Yup, Porky here is stepping up to take one for the team. Again.

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Clearly, Jamie and I are about to start punching this pig, but in order to compare the sound of our punches to your classic movie punch,

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we're going to record it. With this, a directional microphone pointed exactly at the point of impact.

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We will hit the pig, put it on this mic, and we will store it on this computer where we will compare it to this, the sound of a classic movie punch.

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Go at him.

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Nice, did that hurt?

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A little bit, I hit my fingers a little wrong.

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Considering his hand was unprotected, Jamie gave it all he could, but the sound wasn't exactly Silver Screen Superhero.

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You want to piece of me?

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We're going to get hurt if we keep doing it like this.

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To avoid hurting themselves, they have to pull their punches, limiting the power they can put into them.

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And the audio recording reflects their less than action hero efforts.

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Alright, and for comparison, here's the movie punch.

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There's no equivalency at all.

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Which leaves the myth reeling, but not yet knocked out.

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Yet another use for duct tape.

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Next, they're going to add a little action movie oomph to try and get a more Hollywood style sound.

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And with his makeshift boxing glove, Jamie will be able to throw a full-blooded right hook.

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But despite pounding the pork appreciably harder, it's clear the audio still doesn't match up.

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It's still nowhere near.

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Next up, Carrie Grant and Tori set sail for a physics thought experiment.

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Okay, now this is what I'm talking about.

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So can you tell us what we're doing out here?

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Yeah, what are we testing the myth that if we take Grant's sailing, he's going to throw up?

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No, but we're actually doing a sailing myth, so I figured why wouldn't we be in the blueprint room when we could be out here?

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Alright, well can we get on with it? Because this is a ticking time bomb.

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Okay, well our next myth is actually this year's plane on a conveyor belt. It's called blow your own sail.

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That's the one that if you have a windless day, if you take a giant fan and blow it into your sail, you can actually start sailing.

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Exactly, but fans say it might not work.

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Right, because of Newtonian physics.

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Alright, well I think we need to get to the bottom of this one.

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Or get sick trying.

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Speak for yourself, landlubber.

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It's a classic physics fable. Be calmed in the doldrums, our hero pulls out a fan, whips up a wind, and hey presto, she's blowing her own sail.

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But do Newton's laws really mean this myth is dead in the water?

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What happens if you take this physics thought experiment into the real world?

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Okay, it's not because I'm prone to getting seasick, but shouldn't we go back to the shop and do some small scale experiment?

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What? Why?

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I mean, we're here now. Let's just put a fan on here and go for it.

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Well the problem is it's not a windless day. We won't know if we're sailing because of our fan or because of changing the wind.

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Alright, he's got a good point.

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Alright, why don't we go back to the shop, do some small scale tests, get some miniature sailboats and some miniature fans and find out exactly what's happening before we go full scale.

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Yeah, it's probably a good idea.

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Grant is looking a little green, isn't he?

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So to avoid Grant's nautical nausea, it's back to terra firma, where the goal is getting to grips with the underlying science of the story.

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So this myth is essentially about Newton's laws, and specifically his first law, which states that an object will remain in its current state of motion unless acted upon by an external force.

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Now in our case, the object is the boat. Current state of motion at rest. The external force, the wind, acts upon the boat and causes it to move along.

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Now, in the case of our sailor, if this person were able to generate the wind while sitting on the boat, it's no longer an external force.

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They're internal in the same frame of reference. When they blow on it, theoretically, the boat won't move.

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And worryingly for the myth, it's not just Newton's first law making movement unlikely.

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So there is another Newtonian principle, that is the third law of motion, which says that for every action there is an equal and opposite reaction.

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So therefore, if the fan is blowing wind into the sail, it's also pushing the fan backwards.

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If this is true, these two forces are going to cancel each other out, and this boat's not going to go anywhere. It's just going to stall.

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So with two of Newton's laws lining up to sink this sea-going saga, the team prepares for a proof-of-concept test.

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One that will put the scientific theory into practice. And while Carrie makes a raft on wheels, Tori stays high and dry on a fake blue sea.

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Because although this myth is all about boats, there's no need to get wet yet.

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Now obviously we could test it on water, but water poses a couple of problems.

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One, it takes a lot of force to get the boat to move through the water.

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0.44 pounds to be exact. Plus, getting the boat to move straight in the water is going to be another problem we have to overcome.

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But I have a solution for both of those.

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Instead of using the boat and water, we're going to use this cart with wheels on this flat piece of acrylic.

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That way the cart will go straight and we're going to reduce the amount of friction.

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It only takes 0.24 pounds of force to move this car. This is going to be perfect.

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Still to come on MythBusters. The audio action heats up. There's a sting in the tail.

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This is Big Mom.

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And Tori rides back to the future.

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This is a very bad idea.

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Over the years, the MythBusters have tackled a heap of Hollywood tall tales.

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Until now, the myths have been based upon the tendency of movie makers to suspend reality with physics-defying visual effects.

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But this time, Adam and Jamie are hot on the Oral Trail.

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And to find out if a big screen punch sounds anything like the real thing, Adam's upping the addy.

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As I really don't want to hurt this anymore by punching this poor pig, I'm going to make a fist-punching analog.

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Not a machine. It's going to be pretty simple. It's going to be a combination of this and a combination of that.

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Here we go.

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The Ballistics Gel Fist will provide an accurate-sounding skin-on-skin contact.

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And the leverage of the bat will ensure Adam gets a good solid hit.

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That gets ready.

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That was nice.

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Let's listen.

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To the naked ear, it was a marked improvement. But let's get an objective comparison.

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That was pretty good. Alright, let's listen to the movie sound.

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There's no comparison.

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If the myth was on the ropes before, it's down for the count now.

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But if the movie effect isn't a recording of a real punch, what exactly is it?

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We need to talk to an expert.

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I think we do.

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Where are we going to find one?

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With a resume that includes a heap of Tim Burton blockbusters, Steve knows exactly how to pack a Hollywood punch.

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Why does an R best punch sound like this?

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You have a punch that sounds like punching a face.

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The Hollywood one is not about that. It's about drama. It's about selling the story.

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You might add a whoosh of something like this, a pipe or a dowel.

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Alright, just a little bit of that leading into the punch is going to give you that sense of the fist really moving fast.

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I noticed that you had the really good slap sound, but you might want to have a little bit of chest kind of like low end to it.

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You might want to either just...

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Just a little bit of that can give you that sense of kind of a skull underneath that face slap that you got.

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Yeah.

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What else?

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You might want to hear the sound of a skull cracking.

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Wow.

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Well, that's... I love it.

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So those are the individual elements that go to make up a Hollywood punch.

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And by layering them, you get a result that's rich in texture and depth.

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Let's take our best punch at the pig.

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Alright, now Steve said it needed some low end. Let's take one of Steve's chest hits.

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Now he said it needed a whoosh. Let's take the one of the swings he made of that little pipe.

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And then finally, let's add in some bone cracking walnut sounds.

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And play them all together and see what we get.

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It's pretty good, huh?

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Yep, but it doesn't change the result.

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Punch sound effects are Hollywood fiction and the myth is busted.

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Carrie Grant and Tori are tackling a maritime myth that contradicts the father of physics.

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Can you move your boat by blowing your own sail?

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To find out, they're setting up a small scale proof of concept.

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Okay, the next step is the fans.

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So I got a whole bunch of little desk fans.

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I'm going to see if any of them are going to work for this experiment.

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When I turn them on and put them on here, it should push the little car backwards.

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Carrie needs to find a fan.

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Okay, you're not going to work?

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With a power to weight ratio.

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Nope.

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That will make the raft move.

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I think it's too heavy.

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The desk fans are just too feeble, so Carrie goes for broke with a model airplane propeller.

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Okay, ready?

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That ought to work.

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Meanwhile, Grant has a small scale sail up his sleeve.

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And after he rigs it to the raft, the guys are all set to clear up the fanside controversy.

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When you blow your own sail, will you stall as the Newtonian advocates predict or sail off into the sunset?

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All right, now it's time to replicate the myth in small scale.

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We have our fan attached to our raft, which is going to be blowing into the sail that's attached to the raft.

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Now, according to Newton's third law of motion, these two forces should cancel each other out.

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In this boat, you're going to stall.

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So just like in the wind source, the wind source is on the boat.

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Blow your own sail.

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Here we go.

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All right.

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That's great.

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All right, let's go.

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All right.

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That's great.

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All right, it looks like Newton's laws are cancelling out cartoon laws.

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Yep, and here's how.

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If you do a test without the sail, using just the fan, you can see there's enough thrust to move the boat backwards.

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But put a sail in the way and that backwards thrust is cancelled out by the equal at opposite force pushing the boat forward.

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The boat stalls and the myth is busted.

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Or is it?

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Because our intrepid trio aren't giving up so easily.

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Coming up next on Mythbusters, can we use this fan to blow our own sail?

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What do we have next?

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Well, as you know, the rattlesnake.

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Phenomus rattlesnake and its iconic warning rattle are completely endemic to the American Western.

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And what I want to know is, is the sound we're accustomed to hearing from the rattlesnake actually a real rattlesnake sound.

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Well, this isn't a rattler. This is a Madagascar Tree boa.

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You are such a buzzkill.

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She likes you.

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Yeah, I like her.

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Anybody that's seen a western knows the sound that a rattlesnake makes.

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But is that actually the sound?

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Or is that a movie construct?

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So we're going to have to get ourselves a real rattlesnake and see what the sound like.

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So Owen, are we going to be able to get him to rattle without freaking him out?

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Well, this is a big bob and just try stopping him.

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Really?

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Yeah.

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He likes to rattle.

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He likes to talk.

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This is Big Bob and this is the classic movie sound effect of the rattlesnake.

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What we want to know is how much like that does Big Bob sound?

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Shall we record this guy?

227
00:16:51,000 --> 00:16:52,000
I think so.

228
00:16:52,000 --> 00:16:55,000
Here we go. Let's go for it.

229
00:16:59,000 --> 00:17:00,000
Awesome.

230
00:17:00,000 --> 00:17:01,000
There we go.

231
00:17:01,000 --> 00:17:05,000
That sounded pretty good, but let's get an objective assessment.

232
00:17:06,000 --> 00:17:11,000
All right, let's start with the movie rattlesnake.

233
00:17:11,000 --> 00:17:12,000
Go.

234
00:17:18,000 --> 00:17:21,000
And now here's Big Bob.

235
00:17:28,000 --> 00:17:29,000
That is dead on.

236
00:17:29,000 --> 00:17:30,000
That's the same sound.

237
00:17:30,000 --> 00:17:35,000
Absolutely clear that they used real rattlesnakes to make rattlesnake sounds in films.

238
00:17:35,000 --> 00:17:36,000
I think so.

239
00:17:36,000 --> 00:17:37,000
Confirmed.

240
00:17:45,000 --> 00:17:50,000
So far in Blow Your Own Sail, there are no flaws in Newton's Laws.

241
00:17:50,000 --> 00:17:56,000
The forward thrust captured by the sail has an equal and opposite force pushing backwards,

242
00:17:56,000 --> 00:17:58,000
leaving the boat grounded.

243
00:17:58,000 --> 00:18:00,000
But it's not over yet.

244
00:18:00,000 --> 00:18:04,000
The team thinks that tweaking the variables might get things moving.

245
00:18:04,000 --> 00:18:05,000
So we're going to do all sorts of experiments.

246
00:18:05,000 --> 00:18:06,000
We're going to try different sails.

247
00:18:06,000 --> 00:18:07,000
We're going to try different winds.

248
00:18:07,000 --> 00:18:10,000
And we're going to see if we can actually blow your own sail.

249
00:18:10,000 --> 00:18:11,000
Yep.

250
00:18:11,000 --> 00:18:16,000
With the fan, sail and boat all in proportion, everything is canceled out.

251
00:18:16,000 --> 00:18:21,000
So they're starting by making their small scale sail smaller.

252
00:18:21,000 --> 00:18:25,000
Now you're probably asking yourself, why are you guys testing a small sail?

253
00:18:25,000 --> 00:18:29,000
But if you look to the graphic, you'll see what I think is going to happen.

254
00:18:29,000 --> 00:18:34,000
I think that the wind is going to actually get around the small sail and push the sailboat backwards.

255
00:18:34,000 --> 00:18:40,000
Now given what we've seen so far, it may seem surprising to you that we think the boat is going to travel backwards.

256
00:18:40,000 --> 00:18:43,000
Now there's a lot of thrust coming off of this prop.

257
00:18:43,000 --> 00:18:50,000
If the size of the sail is small compared to the source of the wind, you may get some of that thrust escaping around the edges of the sail,

258
00:18:50,000 --> 00:18:53,000
giving us a net thrust pushing the boat backwards.

259
00:18:53,000 --> 00:18:57,000
All right, here we go. Three, two, one.

260
00:18:57,000 --> 00:19:01,000
Hey, look at that. It cancels itself out.

261
00:19:01,000 --> 00:19:04,000
All right, you know what? Should we turn up the speed?

262
00:19:04,000 --> 00:19:05,000
Sure.

263
00:19:05,000 --> 00:19:07,000
Yeah, let's try it and see what happens.

264
00:19:10,000 --> 00:19:11,000
Whoa!

265
00:19:12,000 --> 00:19:14,000
That was weird.

266
00:19:14,000 --> 00:19:19,000
It seems if the sail contains all of the fan's thrust, the boat is marooned.

267
00:19:19,000 --> 00:19:24,000
But tweak the sail size and fan speed and you start moving.

268
00:19:24,000 --> 00:19:27,000
However, they're heading in the wrong direction.

269
00:19:27,000 --> 00:19:30,000
To reverse that, maybe they need to go bigger.

270
00:19:30,000 --> 00:19:33,000
For the next test, we've stepped up the size of the sail.

271
00:19:33,000 --> 00:19:39,000
But to do that, we also had to raise the fan so that the airstream hits right into the center of our sail.

272
00:19:39,000 --> 00:19:41,000
Hopefully this will propel the boat.

273
00:19:41,000 --> 00:19:42,000
Ready when you are.

274
00:19:42,000 --> 00:19:43,000
Okay, here we go.

275
00:19:43,000 --> 00:19:47,000
Wow, that's not going forward at all. The forces are still canceling each other out.

276
00:19:47,000 --> 00:19:48,000
Can you dial it up?

277
00:19:50,000 --> 00:19:53,000
100%! Whoa! That's looking scary!

278
00:19:53,000 --> 00:19:55,000
It's starting to go! It's starting to go!

279
00:19:55,000 --> 00:19:58,000
Faster! Moving forward!

280
00:19:58,000 --> 00:19:59,000
Woo!

281
00:19:59,000 --> 00:20:00,000
Hey!

282
00:20:03,000 --> 00:20:07,000
With faster wind speed, you can blow your own sail!

283
00:20:07,000 --> 00:20:10,000
All right, look. I'm not a sailor and I'm not an aeronautical engineer.

284
00:20:10,000 --> 00:20:12,000
But this is what I think is happening.

285
00:20:12,000 --> 00:20:17,000
So, the fan provides a certain amount of thrust that blows into the sail.

286
00:20:17,000 --> 00:20:20,000
The sail in turn can only absorb so much of that thrust.

287
00:20:20,000 --> 00:20:27,000
The rest of it gets reflected back, leaving us with a net thrust vector causing the boat to go forward.

288
00:20:28,000 --> 00:20:33,000
Yep, the reflection means the sum of the total thrust is in a forward direction.

289
00:20:34,000 --> 00:20:36,000
We just made a lot more wins!

290
00:20:36,000 --> 00:20:38,000
A lot more wins!

291
00:20:38,000 --> 00:20:42,000
What is the most wind we can produce with the biggest fan we can use?

292
00:20:42,000 --> 00:20:43,000
Jet engine.

293
00:20:43,000 --> 00:20:46,000
Yeah, that would be awesome!

294
00:20:46,000 --> 00:20:48,000
What a great proof of concept, though.

295
00:20:50,000 --> 00:20:52,000
Next on Mythbusters.

296
00:20:52,000 --> 00:20:53,000
Come on!

297
00:20:53,000 --> 00:20:55,000
We'll blow your own sail, take off.

298
00:20:59,000 --> 00:21:04,000
Carrie Grant and Tori have found that with enough puff and a big enough sail,

299
00:21:04,000 --> 00:21:07,000
it is possible to blow your own sail.

300
00:21:07,000 --> 00:21:08,000
More power!

301
00:21:08,000 --> 00:21:11,000
But their little toy raft didn't move very fast.

302
00:21:12,000 --> 00:21:18,000
To nail this sea-going saga in the small scale, the team feel the need for more speed.

303
00:21:18,000 --> 00:21:23,000
So, we are moving on to a jet-cap model turbine engine.

304
00:21:23,000 --> 00:21:27,000
This thing can make a model plane fly at 250 miles an hour.

305
00:21:27,000 --> 00:21:31,000
It puts out 17.5 pounds of thrust.

306
00:21:31,000 --> 00:21:33,000
This is going to give us the wind speeds that we need.

307
00:21:33,000 --> 00:21:37,000
But first, what I need to do is mount this engine to our longboard skateboard.

308
00:21:37,000 --> 00:21:41,000
The reason why we are using a longboard skateboard is because this thing puts out so much heat,

309
00:21:41,000 --> 00:21:44,000
we got to keep our sail away from the source.

310
00:21:44,000 --> 00:21:46,000
And speaking of heat.

311
00:21:46,000 --> 00:21:50,000
So, one of the problems with upgrading our source of thrust to a jet engine

312
00:21:50,000 --> 00:21:54,000
is that the exhaust gases can be in excess of 600 degrees Celsius.

313
00:21:54,000 --> 00:21:55,000
Now, this is silk.

314
00:21:55,000 --> 00:21:59,000
This is the ideal material we found for our small scale experiment.

315
00:21:59,000 --> 00:22:06,000
The only problem with silk is that when you expose it to flame, this happens.

316
00:22:06,000 --> 00:22:12,000
So, while Grant looks into flame-resistant sail materials, Tari gets busy with the sailboard bill.

317
00:22:12,000 --> 00:22:18,000
Just like before, they'll be on land using wheels rather than on water in a boat.

318
00:22:18,000 --> 00:22:22,000
It's kind of fitting that we're using this jet engine because a long time ago,

319
00:22:22,000 --> 00:22:25,000
I actually built a jet engine out of a vacuum cleaner motor.

320
00:22:25,000 --> 00:22:27,000
It didn't have much thrust.

321
00:22:27,000 --> 00:22:30,000
I mean, practically it had no thrust at all.

322
00:22:30,000 --> 00:22:35,000
But it's kind of cool to actually use a real jet engine for an experiment.

323
00:22:35,000 --> 00:22:39,000
With the baby engine on board, it's over to Grant.

324
00:22:39,000 --> 00:22:43,000
Okay, so this is flame-resistant material.

325
00:22:43,000 --> 00:22:49,000
This is a 6061 aluminum frame, which has a melting temperature above that of the jet exhaust.

326
00:22:49,000 --> 00:22:52,000
This is the kind of sail you're going to need if you're going to use a jet engine

327
00:22:52,000 --> 00:22:54,000
to blow yourself along.

328
00:22:54,000 --> 00:22:57,000
The jet-powered sailboard is done.

329
00:22:57,000 --> 00:22:59,000
Now to give it a run.

330
00:22:59,000 --> 00:23:03,000
There are not many places you can fire off a mini jet engine,

331
00:23:03,000 --> 00:23:07,000
but a creepy, abandoned naval base is won.

332
00:23:07,000 --> 00:23:09,000
This thing looks dangerous.

333
00:23:09,000 --> 00:23:11,000
Yeah, I think we need to ride it before we test. What do you think?

334
00:23:11,000 --> 00:23:13,000
Ride a jet-powered skateboard.

335
00:23:13,000 --> 00:23:15,000
Yeah, are you guys dying to do it?

336
00:23:15,000 --> 00:23:20,000
Not really, but I would enjoy another decade of watching you fall off this thing in slow motion

337
00:23:20,000 --> 00:23:22,000
and work for the bicycle.

338
00:23:22,000 --> 00:23:27,000
I think this is a very bad idea.

339
00:23:27,000 --> 00:23:30,000
So before we start doing the experiment, I want to test this engine.

340
00:23:30,000 --> 00:23:34,000
So I've turned the engine around, that way I can ride it, and I won't burn my butt.

341
00:23:34,000 --> 00:23:39,000
Unfortunately for Tori, our health insurance actually covers a full body cast.

342
00:23:39,000 --> 00:23:41,000
I'm kind of getting nervous. I don't know why.

343
00:23:41,000 --> 00:23:46,000
So if anything untoward should happen, he'll be covered.

344
00:23:47,000 --> 00:23:49,000
What could possibly go wrong?

345
00:23:49,000 --> 00:23:52,000
I got a jet engine strapped to the skateboard.

346
00:23:52,000 --> 00:23:55,000
All right, fire it up.

347
00:23:55,000 --> 00:23:59,000
Medic standing by. Somebody dial 911.

348
00:24:04,000 --> 00:24:09,000
On his jet-powered skateboard is Tori about to take a trip to the future

349
00:24:09,000 --> 00:24:12,000
or a trip back to the ER.

350
00:24:17,000 --> 00:24:23,000
Oh my God, it works.

351
00:24:23,000 --> 00:24:26,000
Every kid's going to want one of these for Christmas.

352
00:24:26,000 --> 00:24:28,000
That was a good test.

353
00:24:28,000 --> 00:24:33,000
What that tells me is that the jet engine, which mind you, is only this big,

354
00:24:33,000 --> 00:24:39,000
provides enough thrust to carry Tori who weighs 175 pounds on top of the skateboard.

355
00:24:39,000 --> 00:24:42,000
Now if we replace Tori with the sail,

356
00:24:42,000 --> 00:24:46,000
I think we're going to have plenty of thrust for our experiment.

357
00:24:48,000 --> 00:24:51,000
All right, this is extreme blow your own sail.

358
00:24:51,000 --> 00:24:53,000
Do it.

359
00:24:54,000 --> 00:24:56,000
Oh, I love this sail.

360
00:24:58,000 --> 00:25:00,000
Come on, baby.

361
00:25:00,000 --> 00:25:02,000
Come on.

362
00:25:02,000 --> 00:25:03,000
Gotta look at that.

363
00:25:03,000 --> 00:25:05,000
Go, go, go, go.

364
00:25:08,000 --> 00:25:10,000
That worked perfectly.

365
00:25:10,000 --> 00:25:14,000
The jet engine was powerful enough to overcome the counseling forces

366
00:25:14,000 --> 00:25:17,000
and we got our sailboat to move forward.

367
00:25:20,000 --> 00:25:22,000
We did it!

368
00:25:23,000 --> 00:25:25,000
Oh, the sail!

369
00:25:25,000 --> 00:25:27,000
So initially when we started out testing this myth,

370
00:25:27,000 --> 00:25:31,000
it was with a very small boat on top of a table.

371
00:25:31,000 --> 00:25:33,000
And this, this is what we do.

372
00:25:33,000 --> 00:25:38,000
We step things up each time and we've gone to a jet-powered skateboard

373
00:25:38,000 --> 00:25:40,000
with a fireproof sail.

374
00:25:40,000 --> 00:25:45,000
And I've got to say, this is great because what this says is that each time

375
00:25:45,000 --> 00:25:48,000
it's been possible to blow your own sail.

376
00:25:48,000 --> 00:25:52,000
Now we've just got to go up to the big thing, the real thing, boat.

377
00:25:52,000 --> 00:25:54,000
Next step's going to be fun.

378
00:25:54,000 --> 00:25:56,000
Full scale, baby.

379
00:25:56,000 --> 00:25:59,000
And back at the shop they've taken delivery of just the thing.

380
00:25:59,000 --> 00:26:02,000
A boat with a built-in fan.

381
00:26:02,000 --> 00:26:06,000
So we are going to take this myth full scale and this is the boat we are going to use.

382
00:26:06,000 --> 00:26:11,000
It is a shower water spider swap boat and this thing comes with a fan

383
00:26:11,000 --> 00:26:17,000
which is attached to a 40 horsepower engine that's capable of putting out 200 pounds of thrust.

384
00:26:18,000 --> 00:26:20,000
Woo!

385
00:26:20,000 --> 00:26:25,000
We're going to take this fan, flip it around, put up a mask, put up a sail

386
00:26:25,000 --> 00:26:28,000
and see if we can blow our own sail.

387
00:26:28,000 --> 00:26:31,000
It was dragging me, it was actually pulling me off my feet.

388
00:26:31,000 --> 00:26:33,000
I think this is going to do it.

389
00:26:33,000 --> 00:26:36,000
With Grant measuring wind speeds of 63 miles per hour,

390
00:26:36,000 --> 00:26:39,000
this puppy is clearly powerful enough.

391
00:26:39,000 --> 00:26:44,000
Which means it's time to take delivery of the sail and get busy with the rigging.

392
00:26:45,000 --> 00:26:48,000
Okay, now that we have the sail, it's time to erect the mast.

393
00:26:48,000 --> 00:26:53,000
Now we're making it out of aluminum because it's lightweight and has a really high tensile strength.

394
00:26:53,000 --> 00:26:56,000
But we're making a removable base completely out of steel.

395
00:26:56,000 --> 00:27:02,000
We want to clamp onto the boat instead of drilling or welding because it's a borrowed boat, it's gorgeous.

396
00:27:02,000 --> 00:27:09,000
Against all odds, our team of landlubbers has built and rigged its own square sail from scratch.

397
00:27:09,000 --> 00:27:12,000
Faster, go faster.

398
00:27:12,000 --> 00:27:14,000
Woo!

399
00:27:15,000 --> 00:27:17,000
Ready to blow your sail?

400
00:27:18,000 --> 00:27:20,000
Yeah, I don't have enough wind.

401
00:27:20,000 --> 00:27:26,000
To find out if it'll go when the fan blows, it's time to take this test down to the waterline.

402
00:27:26,000 --> 00:27:30,000
We found ourselves a lake that's completely isolated so we have no current and no wind.

403
00:27:30,000 --> 00:27:33,000
This should be the perfect place to experiment.

404
00:27:33,000 --> 00:27:36,000
And the perfect place for a pre-test joyride.

405
00:27:36,000 --> 00:27:41,000
With the throttle full on, the team thrashes around getting their bearings

406
00:27:41,000 --> 00:27:45,000
and getting a feel for the Swamp Boat's fan-powered thrust.

407
00:27:46,000 --> 00:27:48,000
It handles beautifully.

408
00:27:48,000 --> 00:27:49,000
Love it.

409
00:27:49,000 --> 00:27:51,000
But will it sail?

410
00:27:57,000 --> 00:28:03,000
The next classic Hollywood sound effect to get the Mythbusters treatment is the gun silencer.

411
00:28:04,000 --> 00:28:10,000
And down at the South San Francisco Police Department shooting range, the boys mean business.

412
00:28:10,000 --> 00:28:15,000
Cue Meyer Sound's senior audio scientist, Dr. Roger Schwenke.

413
00:28:16,000 --> 00:28:24,000
With several previous appearances on the show, he gets the much sought after title of Honorary Mythbuster.

414
00:28:24,000 --> 00:28:26,000
Strokebot, baby.

415
00:28:26,000 --> 00:28:32,000
And today he's brought along his laboratory grade recording and analysis equipment.

416
00:28:33,000 --> 00:28:38,000
We want to see whether these things actually make the same sounds in real life that they do in the movies.

417
00:28:38,000 --> 00:28:40,000
Or do they make any sound at all?

418
00:28:41,000 --> 00:28:43,000
How do these silencers work?

419
00:28:43,000 --> 00:28:46,000
Well, they're kind of like mufflers on cars.

420
00:28:46,000 --> 00:28:53,000
They've got a series of baffles in them that sort of slow down and redirect the gases that are passing through

421
00:28:53,000 --> 00:28:56,000
and absorb a lot of the energy and the sound.

422
00:28:56,000 --> 00:29:02,000
That's how silencers silence, but outside a movie theater, but exactly are they used for?

423
00:29:02,000 --> 00:29:06,000
Look, we would be remiss if we didn't explain that this is not an assassin's tool.

424
00:29:06,000 --> 00:29:10,000
Actually, military and law enforcement love suppressors for four main reasons.

425
00:29:10,000 --> 00:29:15,000
The extra weight out at the front of the gun actually reduces both muzzle lift and the recoil of the gun,

426
00:29:15,000 --> 00:29:17,000
making it easier to aim and stay on target.

427
00:29:17,000 --> 00:29:22,000
It does actually reduce the sound and the concussion, the blast of the bullet,

428
00:29:22,000 --> 00:29:28,000
and it also reduces the muzzle flash to zero, all of which makes this a safer and easier weapon to use.

429
00:29:29,000 --> 00:29:31,000
Right, let's get down to testing.

430
00:29:31,000 --> 00:29:34,000
First up, Adam and Jamie take aim at a baseline.

431
00:29:34,000 --> 00:29:38,000
First, we are going to fire an unmodified pistol at the target.

432
00:29:38,000 --> 00:29:41,000
And three, two, one.

433
00:29:45,000 --> 00:29:49,000
Then we're going to put a silencer on that gun and shoot again at the target

434
00:29:49,000 --> 00:29:57,000
and compare the silenced round sound to the original gun sound and to the movie sound effect of the silencer.

435
00:30:02,000 --> 00:30:06,000
A bold silenced pistol. It's just as cool as you think it is.

436
00:30:06,000 --> 00:30:10,000
Now for the suppressor. Is the movie version anything like reality?

437
00:30:10,000 --> 00:30:11,000
Thank you.

438
00:30:11,000 --> 00:30:16,000
Do silences work as well in real life as they do on film?

439
00:30:19,000 --> 00:30:20,000
That's nice.

440
00:30:20,000 --> 00:30:24,000
That was pretty cool. That seemed a lot quieter than I thought it would.

441
00:30:24,000 --> 00:30:28,000
And Jamie's 9mm pistol is equally surprising.

442
00:30:31,000 --> 00:30:37,000
It's an impressive improvement, but for analysis, let's hear from our expert acoustician.

443
00:30:37,000 --> 00:30:41,000
First, decibels, a measure of the intensity of the sound pressure.

444
00:30:41,000 --> 00:30:48,000
So we go from 161 and then suppress, we get down to 128. That's a big change.

445
00:30:48,000 --> 00:30:52,000
That goes from dangerous to hearing to safe.

446
00:30:52,000 --> 00:30:58,000
But it's not just the power. The texture and time signature of the sound is also altered.

447
00:30:58,000 --> 00:30:59,000
Can we hear?

448
00:30:59,000 --> 00:31:01,000
Here's the one suppressed.

449
00:31:01,000 --> 00:31:04,000
Okay, now let's hear suppressed.

450
00:31:07,000 --> 00:31:08,000
Yeah, that tells the story.

451
00:31:08,000 --> 00:31:11,000
And it's a story worth hearing again.

452
00:31:13,000 --> 00:31:16,000
A story with a surprise ending.

453
00:31:16,000 --> 00:31:22,000
I swear, I went into this one thinking this would be completely busted. I'm kind of blown away.

454
00:31:22,000 --> 00:31:26,000
But what about the all-important movie version? How does that stack up?

455
00:31:26,000 --> 00:31:27,000
Can we hear the Hollywood sound?

456
00:31:27,000 --> 00:31:28,000
Yeah, sure.

457
00:31:30,000 --> 00:31:32,000
Dude, that is far out.

458
00:31:32,000 --> 00:31:35,000
Far out indeed. But although it's not quite identical,

459
00:31:38,000 --> 00:31:43,000
the real-life suppressor does reduce the volume of the gunshot to Hollywood levels.

460
00:31:46,000 --> 00:31:49,000
And that's enough to impress Adam a lot.

461
00:31:49,000 --> 00:31:56,000
One of the most common questions we get is, are we surprised by the results that we come up with on the show?

462
00:31:56,000 --> 00:31:59,000
Today, monstrously surprised.

463
00:31:59,000 --> 00:32:08,000
I arrived at work this morning expecting that we would completely bust the myth that you could possibly suppress the sound of a bullet anywhere close to what the movies would lead you to believe.

464
00:32:08,000 --> 00:32:15,000
And I leave today being a convert to the idea this thing is totally plausible.

465
00:32:16,000 --> 00:32:23,000
The only reason I'm not calling it confirmed is because instead of a QQ sound like they do in the movies, I'm shooting my cameraman's knees out here,

466
00:32:23,000 --> 00:32:26,000
it's more like a pfft sound.

467
00:32:26,000 --> 00:32:31,000
But that is picking nits as far as I'm concerned. This is astonishing.

468
00:32:36,000 --> 00:32:40,000
Okay, so here's the plan. We've got our full-size fan boat and our full-size sail.

469
00:32:40,000 --> 00:32:46,000
We get out on the water and try it first in its regular configuration with the fan facing backwards.

470
00:32:46,000 --> 00:32:48,000
And we'll turn it on and hopefully go forward.

471
00:32:48,000 --> 00:32:56,000
Then we're going to flip the fan around, raise the sail, and see if you can actually blow your own sail.

472
00:32:56,000 --> 00:32:58,000
There she blows!

473
00:32:58,000 --> 00:33:04,000
So first up, with the fan pointing backwards, Carrie and Grant will do a straight line speed test.

474
00:33:04,000 --> 00:33:11,000
That way, when they get the sail up and face the fan forwards, they'll have a reference for their performance.

475
00:33:11,000 --> 00:33:14,000
How do you feel about calling this the Queen Airy?

476
00:33:15,000 --> 00:33:21,000
She may have a name, but the Queen Airy is not off to the best of starts.

477
00:33:21,000 --> 00:33:24,000
I think we're in a bit of a predicament here.

478
00:33:24,000 --> 00:33:28,000
The weight of the sail is making it very tricky to maneuver.

479
00:33:28,000 --> 00:33:31,000
You guys are going zero miles an hour!

480
00:33:32,000 --> 00:33:35,000
But despite Tori's encouragement,

481
00:33:35,000 --> 00:33:38,000
Looks like these islands are boat magnets.

482
00:33:38,000 --> 00:33:41,000
Grant and Carrie do finally get into position.

483
00:33:42,000 --> 00:33:45,000
First test up is the fan in the right configuration.

484
00:33:45,000 --> 00:33:49,000
The sail down, I'm going to get in the chase boat, have them drive towards me,

485
00:33:49,000 --> 00:33:52,000
and I'm going to check their speed with the radar gun.

486
00:33:52,000 --> 00:33:58,000
Alright, this is the first test, fan facing backwards, sail down, speed test.

487
00:33:58,000 --> 00:33:59,000
Here we go!

488
00:34:02,000 --> 00:34:06,000
Now, if you asked me when we were in the shop and we first turned on the swamp boat,

489
00:34:06,000 --> 00:34:10,000
and Grant took out the animometer and got 60 miles an hour standing me on the fan,

490
00:34:10,000 --> 00:34:15,000
I would have said that blow your own sailboat was going to boom, blast across the water.

491
00:34:15,000 --> 00:34:20,000
But now that we've done a test with the mast on, even with the sail down,

492
00:34:20,000 --> 00:34:22,000
it really slowed down the boat.

493
00:34:22,000 --> 00:34:26,000
I think we're going to get some movement, but it's going to be slight.

494
00:34:26,000 --> 00:34:28,000
How fast were we?

495
00:34:28,000 --> 00:34:30,000
20 miles an hour!

496
00:34:30,000 --> 00:34:32,000
That was a good test.

497
00:34:32,000 --> 00:34:36,000
Let's flip the fan around and put the sail up and see how fast we go when we blow our own sail.

498
00:34:41,000 --> 00:34:46,000
Music

499
00:34:46,000 --> 00:34:54,000
Carrie Grant and Tori are preparing to flip the fan and raise the sail for a physics-defined finale.

500
00:34:54,000 --> 00:34:59,000
They're about to find out, with a real boat on real water,

501
00:34:59,000 --> 00:35:02,000
if it's possible to really blow your own sail.

502
00:35:02,000 --> 00:35:04,000
But plain sailing, it's not.

503
00:35:04,000 --> 00:35:08,000
I feel like there might be just a little element of danger here.

504
00:35:08,000 --> 00:35:10,000
I hope that holds.

505
00:35:10,000 --> 00:35:14,000
I mean, the swamp boat is not meant to have the fan backwards,

506
00:35:14,000 --> 00:35:18,000
and it's definitely not meant to have this giant lumbering sail on it.

507
00:35:18,000 --> 00:35:19,000
How's your line of sight?

508
00:35:19,000 --> 00:35:23,000
I think we might actually have a little danger of tipping.

509
00:35:23,000 --> 00:35:26,000
I just really don't want to get wet today.

510
00:35:26,000 --> 00:35:28,000
Raise the main sail!

511
00:35:28,000 --> 00:35:30,000
Flip the jib-jab!

512
00:35:30,000 --> 00:35:33,000
I'm trimming as fast as I can!

513
00:35:33,000 --> 00:35:37,000
Now, in order for this myth to be confirmed, what we're looking for is forward movement.

514
00:35:37,000 --> 00:35:40,000
Due to the fan blowing into the sail.

515
00:35:40,000 --> 00:35:43,000
Not drifting, not just poking along.

516
00:35:43,000 --> 00:35:47,000
We're actually talking about directed forward movement.

517
00:35:47,000 --> 00:35:48,000
Forget that?

518
00:35:48,000 --> 00:35:50,000
I'm looking at confirmed.

519
00:35:50,000 --> 00:35:52,000
Okay, I think that looks parallel.

520
00:35:52,000 --> 00:35:57,000
So what we're also interested in is the comparison of the speed of the fan blowing into the sail

521
00:35:57,000 --> 00:36:01,000
versus the fan pointed backwards.

522
00:36:01,000 --> 00:36:02,000
Alright, you guys ready?

523
00:36:02,000 --> 00:36:04,000
Will we get improvement?

524
00:36:04,000 --> 00:36:06,000
Probably not.

525
00:36:06,000 --> 00:36:09,000
The target that we're looking at is 20 miles an hour.

526
00:36:09,000 --> 00:36:16,000
If we get even a quarter of that five miles an hour, I would be very, very impressed.

527
00:36:16,000 --> 00:36:23,000
Or, at its very real possibility, the shallow bottom boat with its top heavy sail goes bottom up.

528
00:36:23,000 --> 00:36:25,000
Okay, we're in!

529
00:36:25,000 --> 00:36:28,000
We have no idea what can go wrong.

530
00:36:28,000 --> 00:36:32,000
I mean, the mask could blow off, the boat could flip over.

531
00:36:32,000 --> 00:36:35,000
They might get sucked into the fan and chopped up into little pieces.

532
00:36:35,000 --> 00:36:38,000
Hey, good sailing. Good luck.

533
00:36:38,000 --> 00:36:40,000
What was that about being sucked into the fan?

534
00:36:40,000 --> 00:36:43,000
Chopped into little pieces.

535
00:36:43,000 --> 00:36:49,000
There off, Tori and the support vehicle tows them out to open water.

536
00:36:49,000 --> 00:36:57,000
With plenty of space, no major wins or currents, it's the perfect location for a spot of scientific sailing.

537
00:36:57,000 --> 00:36:58,000
Alright, you ready to do this?

538
00:36:58,000 --> 00:36:59,000
Ready.

539
00:36:59,000 --> 00:37:01,000
Okay, here we go.

540
00:37:01,000 --> 00:37:05,000
This is blow your own sail with the full-size boat.

541
00:37:05,000 --> 00:37:07,000
Go, Rolo!

542
00:37:12,000 --> 00:37:17,000
I gotta tell you, the funniest part about this whole experiment is when we first turned on that fan,

543
00:37:17,000 --> 00:37:22,000
and the boat just started to spin and dip down in one direction.

544
00:37:22,000 --> 00:37:24,000
Grant and I both were super wide-eyed.

545
00:37:24,000 --> 00:37:26,000
Just me thought we were going over.

546
00:37:26,000 --> 00:37:29,000
They're wildly out of control.

547
00:37:29,000 --> 00:37:34,000
There's no forward movement, just a whole lot of spinning and crashing.

548
00:37:34,000 --> 00:37:37,000
Very crazy, just there.

549
00:37:37,000 --> 00:37:43,000
So when we first started, and I gunned it, we started turning in a circle, and I was like, this is it.

550
00:37:43,000 --> 00:37:46,000
That's it. We're going in the water.

551
00:37:46,000 --> 00:37:51,000
But, I turned it down and we tried it again, and actually what I found was...

552
00:37:51,000 --> 00:37:53,000
Yeah! It's going in the water!

553
00:37:53,000 --> 00:38:00,000
You keep vectoring the fan. If you keep that thrust at sail, you can actually get it to go forward.

554
00:38:04,000 --> 00:38:07,000
Ha-ha! There she goes!

555
00:38:07,000 --> 00:38:10,000
Look at it! They're going forward!

556
00:38:10,000 --> 00:38:13,000
We blew our own sail! It's working!

557
00:38:13,000 --> 00:38:20,000
By ramping it up myth-buster style, the team has seemingly contradicted Newtonian physics.

558
00:38:20,000 --> 00:38:24,000
It's working. They're blowing their own sail.

559
00:38:24,000 --> 00:38:27,000
Now, this was nuts.

560
00:38:27,000 --> 00:38:30,000
We only got three miles an hour, but we actually got movement.

561
00:38:30,000 --> 00:38:36,000
We got forward movement, and we were able to steer by pointing the wind into different parts of the sail.

562
00:38:36,000 --> 00:38:39,000
I have to say, this is a successful day.

563
00:38:41,000 --> 00:38:44,000
Three miles an hour!

564
00:38:45,000 --> 00:38:53,000
No doubt they'd go a lot faster with the fan facing backwards and no sail, but that's not the point.

565
00:38:53,000 --> 00:38:59,000
The myth asks, can you power a sailboat with your own fan? And you can.

566
00:38:59,000 --> 00:39:06,000
I don't know exactly what's going on, because apparently we're flying in the face of Newton's loss, but here's what I think is happening.

567
00:39:06,000 --> 00:39:09,000
We have a significant amount of thrust coming out of this fan.

568
00:39:09,000 --> 00:39:13,000
It's hitting the sail. The sail can only push so much.

569
00:39:13,000 --> 00:39:19,000
The rest of that thrust gets reflected back, giving us a net thrust pushing us in the forward direction.

570
00:39:19,000 --> 00:39:27,000
And forward in both directions, because to prove that real wind wasn't a factor, Grant and Carrie sail both ways.

571
00:39:27,000 --> 00:39:31,000
Dude, that was awesome!

572
00:39:31,000 --> 00:39:33,000
I cannot believe it. We blew our own sail.

573
00:39:33,000 --> 00:39:35,000
This one is totally confirmed.

574
00:39:35,000 --> 00:39:41,000
Totally confirmed. I mean, this thing went forward with the wind from our own fan.

575
00:39:41,000 --> 00:39:43,000
Confirmed!

576
00:39:48,000 --> 00:39:54,000
You may remember in the opening sequence, Adam and Jamie set off a Hollywood-style explosive fireball.

577
00:39:54,000 --> 00:39:56,000
Bye-bye!

578
00:39:57,000 --> 00:40:02,000
But despite having plenty, the guys didn't blow up the car just for fun.

579
00:40:06,000 --> 00:40:15,000
It was part of the test to find out whether the ubiquitous explosive sound effect you hear in the movies is anything like the real thing.

580
00:40:15,000 --> 00:40:21,000
So first up, let's show you the ingredients of a typical silver screen big bang.

581
00:40:21,000 --> 00:40:25,000
Two gallons of gasoline, ringed in some debt cord and stuck in the front seat.

582
00:40:25,000 --> 00:40:30,000
That's how Hollywood makes its spectacular fireball explosions.

583
00:40:30,000 --> 00:40:32,000
But what do they really sound like?

584
00:40:32,000 --> 00:40:34,000
Bye-bye!

585
00:40:36,000 --> 00:40:38,000
It's quite a difference, huh?

586
00:40:41,000 --> 00:40:46,000
Much like the punch, the movie version has a lot more texture and depth.

587
00:40:47,000 --> 00:40:51,000
Quite simply, it's more dramatic than the real thing.

588
00:40:53,000 --> 00:40:55,000
How did the waveforms compare?

589
00:40:55,000 --> 00:41:00,000
They're clearly very different. The gas explosion we just did had a very sudden onset,

590
00:41:00,000 --> 00:41:05,000
and the energy is concentrated in a very narrow range of low frequencies.

591
00:41:07,000 --> 00:41:13,000
Whereas the classic movie explosion has a much slower onset,

592
00:41:13,000 --> 00:41:17,000
and the energy is over a much wider range of frequencies,

593
00:41:17,000 --> 00:41:21,000
and it lasts for a much, much longer time. It's a very different sound.

594
00:41:22,000 --> 00:41:24,000
Which sounds like a busted myth.

595
00:41:24,000 --> 00:41:29,000
But the guys aren't done yet. They're not getting bogged down with just one big boom.

596
00:41:30,000 --> 00:41:34,000
If the sound of a gasoline-fueled fireball doesn't match the movies,

597
00:41:34,000 --> 00:41:37,000
maybe a real high-explosive will.

598
00:41:38,000 --> 00:41:41,000
Queer old friend, C4.

599
00:41:41,000 --> 00:41:46,000
Now we're going to blow this car up for realsies and check out how that sounds.

600
00:41:46,000 --> 00:41:48,000
Alright, here we go.

601
00:41:48,000 --> 00:41:53,000
2.2 pounds of C4 in 3, 2, 1.

602
00:41:53,000 --> 00:41:58,000
Ah! Oh! Oh! Oh!

603
00:41:58,000 --> 00:42:01,000
Kaboom!

604
00:42:03,000 --> 00:42:06,000
That was a good solid thud.

605
00:42:06,000 --> 00:42:09,000
Kind of makes you feel all warm and fuzzy inside, don't it?

606
00:42:09,000 --> 00:42:11,000
It does.

607
00:42:12,000 --> 00:42:14,000
A good solid thud.

608
00:42:14,000 --> 00:42:19,000
But once again, it's clearly a completely different sound to the sound effect.

609
00:42:20,000 --> 00:42:25,000
I'm looking at the top, the movie explosion, and I'm seeing this big, wide bandwidth of sound.

610
00:42:25,000 --> 00:42:28,000
And I see the C4, and I see nothing like that.

611
00:42:28,000 --> 00:42:31,000
I see one sharp impulse, a little bit of surrounding noise,

612
00:42:31,000 --> 00:42:35,000
but nowhere near the depth and the range of the movie explosion.

613
00:42:35,000 --> 00:42:38,000
I'm going to go out of the limp and say, I think that one's busted.

614
00:42:38,000 --> 00:42:44,000
Yep, the contrast between the real explosions and the film sound effect is as clear as a bell.

615
00:42:44,000 --> 00:42:49,000
And that leaves this final movie myth about as busted as the car.

616
00:42:49,000 --> 00:42:52,000
Let's get out of here before our shoes get all dirty.