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BOOMING

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Dude, c'mon we got into heavy來了

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I'm ready

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E�, E systems

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No final season of Mythbusters would be complete if we did not tackle our all-time favorite

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mechanical cure-all, the miracle material of duct tape.

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We built boats more than one.

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Bridges.

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That really is quite hairy.

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We've bladed off of clips.

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And we picked up cars.

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And we picked you up for that matter and hung you upside down.

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Fun for the whole family.

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Exactly.

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Which begs the question, what do we build in another episode devoted to duct tape?

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What haven't we made?

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And what did we come up with?

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Well, we will be testing whether duct tape is a viable replacement for a car's seatbelt

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and how well it holds up in an accident.

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So there will be some car crashing.

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But first up, we're going to build a weapon of war.

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One from back when you were just a little tight, I think we should make a duct tape trebuchet.

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That's excellent.

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It's got to be the ultimate test for duct tape's abilities.

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Plus, I've always wanted to build a trebuchet.

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So have I, and it's now or never.

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Let's get building.

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Okay.

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Our death ray doesn't seem to be working.

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I'm standing right in it.

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And I'm not dead yet.

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When it comes to ancient weapons of war, we hit the blue!

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The Mythbusters 14-year history is loaded with fun and ammo.

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And in this farewell season duct tape finale, not only are they tackling the most mechanically

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intricate medieval weapon ever made, they have to stick it all together with nothing

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but their all-time favorite material.

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I like this.

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But first, Adam puts the tape aside to work out how one works.

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All right.

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I think we have enough built now to talk about the component pieces of a trebuchet and how

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they work.

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Graphics, can you help me out?

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The main parts are the stand, the swing arm, and the fulcrum, the swing arm, pivots on.

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Now the swing arm has a weight at one end and a sling at the other.

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And here are some important relationships.

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There's a relationship between the long part of the swing arm and the short part.

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It's 3.75 to one.

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And the sling wants to be exactly the length of the long part of the swing arm.

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If you get all that right, apparently this thing throws farther than just about any other

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medieval weapon of war.

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The real long shot will be getting a full-sized trebuchet to work with only duct tape to hold

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it together.

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So the weight here is the sole of the trebuchet.

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The gravitational pull of this weight down causes the whole mechanism to work.

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In the toughest duct tape task the team has ever tackled, that counterweight will eventually

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weigh 750 pounds and exert more than 3,000 foot-pounds of torque.

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That's a fully loaded trebuchet right there.

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Let's see what happens.

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I'll flung it into the ground.

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That's not ideal.

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That's not ideal at all.

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I love making these demonstration models.

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I had ceiling clearly somewhere in the middle of this one.

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It's often some of the most fun that I have on the show.

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I think I made too much of a cup.

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There is nothing better than being able to lay your hands on something even if you're

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going to build it ten times as large.

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I didn't let go.

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Why didn't it let go?

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What the hell?

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Slightly bigger nut.

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That's figure nut.

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After several hours of hands-on tinkering, Adam has the mechanics nailed.

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And successfully launches his model.

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Wow.

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So with that knowledge under their collective belt, Jamie gets down to the nuts and bolts

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of construction, specifically figuring out how to replace the nuts and bolts with duct

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tape.

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Taking what Adam has learned about the trebuchet's action, my focus is going to be on construction

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logistics and dealing with the forces involved.

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At the pivot, our structure has to be able to handle an excess of 3,000 foot-pounds of

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torque.

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Now that's a heck of a lot of load for a few rolls of tape.

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More tape.

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Using triangulation on the lens itself to the abilities of the materials we have at hand.

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That's going to be fricking strong.

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The compressive strength of the wood takes most of the strain, while the flexibility

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and adhesion of the duct tape allows us to create a series of bands to lock the whole

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structure together.

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One.

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And of course, the duct tape is also perfect for creating ropes and canvas-like materials

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for the sling.

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This is all tape and wood.

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That's all tape and these are the beams that we'll be working with.

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Yeah, they're all to scale.

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Nice.

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So Jamie was completely building his to scale, including the beams that we're going to be

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working with.

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I mean, feel it.

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I see that.

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And yet it's just tape.

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So he's done probably 90% of our engineering work that we're going to have to do out in

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the field already here in the shop.

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Not only is Jamie's design cleverly built to scale.

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You made it into the loft.

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That is pretty darn good.

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It's secured by only duct tape and tosses Adam's ammo an impressive distance.

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Question is, can they convert their toy-sized trebuchet into a full-scale weapon of war?

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While the team preps, Adam conjures an unusual commuting conundrum.

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Let me paint you a picture.

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You've arrived at your car.

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First thing in the morning, you have a rush hour commute ahead of you and you find that

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a rodent has chewed all the way through your seat belt.

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Pop quiz.

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What do you do?

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Make it out of duct tape.

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Yeah.

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That's, yes, that's exactly what we're going to do.

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And they're going to be car crashes then.

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Yes, they're on.

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We're going to have to test the efficacy of the seat belt by crashing more than one car.

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I like it.

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Seat belts made of polyester have a breaking strength of 6,000 pounds and save tens of

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thousands of lives every year.

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We're a seat belt, always.

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But in an average 25-mile-an-hour crash, could a duct tape stand in really stay intact?

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Or is this myth a stretch too far for the tacky tape?

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This lovely stretch of tarmac I'm riding on is the runway at the New Jerusalem airport.

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And today, we're going to be setting up some car crashes to see if duct tape can actually

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save your life.

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The column before the storm.

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Car crashes.

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Right alongside explosives, they've been one of our specialties on Mythbusters.

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We've crashed into cars with trucks.

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We've crashed cars in professional facilities.

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Heck, we've even crashed cars into barriers made solely of duct tape.

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Yeah!

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Today, we are trying something brand new for us.

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We're going to crash our cars for this experiment into a pair of giant shipping containers with

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welded steel plates on their front end.

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It's the ultimate test of the tape's tensile talents.

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Can it withstand the stopping force of a fatal car crash?

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Oh, chunky.

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To find out the team is using their crash test dummy...

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Nice!

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...for its intended purpose.

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Buster's going to be driving this car at speed into our trench plates.

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But the problem is, well, Buster has no brain.

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He can't drive.

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The solution?

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A familiar Mythbuster method.

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The self-steering tow rig.

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What we have here is not that much different than a normal steering system.

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Like when you turn your steering wheel, you move both wheels evenly back and forth.

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We've just got a longer bar extending from them.

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And if we put a cable in the middle, this will make both wheels go wherever we pull it.

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So part one of our setup is done.

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Ready to drive on its own.

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Next up is to remove the car windows.

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Yeah, that'll do it.

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Cut the new sunroof.

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This is just like a sardine can.

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So we can clearly see what's happening inside there.

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Yeah! Yeah!

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Come on down to Adam and Jamie's body shop.

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Nice stash.

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Step three is to put Buster and a passenger in this car.

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Yeah, baby.

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Remember, the number one thing you want in an accident is clean under-ware.

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Why two dummies?

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Well, the driver will get a duct tape seat belt,

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and for a control and comparison, his passenger has a regular one.

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Step four is to replace Buster's seat belt with duct tape.

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Let's just do an experiment.

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How much duct tape can I fit through?

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That's four layers.

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That still fits.

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Eight layers of duct tape.

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Still fits.

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Two more.

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Here is ten layers of duct tape.

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Nope.

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That's nine layers of duct tape.

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That's it.

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Nine layers it is.

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So we've arrived at the soul of this story,

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that a broken seat belt can be replaced in a pinch with duct tape.

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Excellent.

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Uh-oh.

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What?

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I'm going to have to remove some of these layers to fit it through the shoulder buckle.

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The improvised seat belt that I've made for Buster is made of between six and nine layers of duct tape.

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Now it's time to tie it into the car,

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and for the bottom, since I've got this seat belt sitting here,

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I'm going to just tie a knot.

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Now when we did duct tape bridge, we did some tensile strength testing on duct tape

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and found that it had a breaking strength of 67.3 pounds per layer.

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When you calculate that out, that means that Buster's got a strap

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that has a 400 pound breaking strength at his shoulder

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and a 600 pound breaking strength at his waist.

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So with the thickest possible duct tape seat belt ready for action,

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how will the guys make a post-crash comparison of the damage to the dummies?

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We're going to look at the accelerometer readings of G-forces that these guys are experiencing

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and see if there's any difference between the one with the seat belt made of duct tape

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and the other with the conventional one.

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The final step is to crash the car into the containers at a bone-crunching 25 miles an hour

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and find out if duct tape can save your life as effectively as a real seat belt.

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Well, time to smash a car.

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I'm in position, ready to go.

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Count it in.

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All right, this is duct tape seat belt crash test at 25 miles an hour in three, two, one.

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There it is, he's starting.

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Coming up in this final season festival, Adam and Jamie together, they're over a hundred and four years old.

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The team's biggest ever build begins and Buster finally gets to stretch duct tape to its life-saving limits.

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It's beautiful.

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Relax. This one hurt a bit.

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Adam and Jamie are taking a final season trip down duct tape memory lane.

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Oh, it's for real.

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Their past is littered with a litany of mythical uses for this miracle mechanical cure-all.

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Nice work, sir.

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It's been proven plausible, more confirmed, and incredible 21 times.

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And back on the seat belt story, Buster's hoping that impressive record continues.

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Remember, the heart of this myth is that duct tape could help you survive a car accident,

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specifically that if your seat belt failed, you could replace it with duct tape.

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Duc tape seat belt 25 mile per hour crash.

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So that it would help you survive a car accident.

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Go!

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Starting slowly.

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Yep, here it comes, here it comes.

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It's beautiful.

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That hit a lot of things.

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Woo, woo, ha!

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That, uh, yeah, things moved a bit.

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That was close to catastrophe.

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So what happened?

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Well, it veered off to the right and hit only the right-hand container, sending it about a foot back.

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It actually came back far enough to bump the boom lift that we were in.

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We got a little bit of a ride.

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The boom lift was shaken, and Adam was stirred.

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But what about the seat belt, the thickest that could possibly be made out of duct tape?

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Did it save Buster?

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The duct tape seat belt broke. It's nine layers at the belt.

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It's only six layers at the shoulder, but that's where it broke.

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Remember those accelerometers we put on the dummies?

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Well, the date is in, and it's cool.

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Our passenger received 30 Gs to his head and 50 Gs to his body.

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He wouldn't have been a happy camper. He might have sustained some injuries, but he might have made it.

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The guy with the duct tape seat belt, however, is another story.

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00:15:31,080 --> 00:15:36,080
He got in excess of 130 Gs both in his head and his body.

250
00:15:36,080 --> 00:15:37,080
He's dead.

251
00:15:37,080 --> 00:15:41,080
The traditional duct tape seat belt design failed.

252
00:15:41,080 --> 00:15:44,080
The myth, like Buster, is busted.

253
00:15:45,080 --> 00:15:47,080
Meaning it's time to ramp it up.

254
00:15:48,080 --> 00:15:53,080
If duct tape is going to help somebody survive a car accident, it's going to have to be more than a belt.

255
00:15:53,080 --> 00:15:58,080
Yep, this duct tape farewell tour is far from dead and buried.

256
00:15:59,080 --> 00:16:03,080
Oh, no, no, no, no. We've only proven that a duct tape seat belt won't work,

257
00:16:03,080 --> 00:16:07,080
but that doesn't mean that duct tape can't help. We have some other ideas.

258
00:16:08,080 --> 00:16:12,080
While Buster patiently waits for another potentially fatal car crash,

259
00:16:12,080 --> 00:16:16,080
the guys are back on the trail of the duct tape trebuchet.

260
00:16:17,080 --> 00:16:23,080
It's an accelerator. You're exchanging heavy weight with 3.75 times the speed of the fall,

261
00:16:23,080 --> 00:16:28,080
and you've got that additional bonus of a little centrifugal force with the sling.

262
00:16:28,080 --> 00:16:29,080
It's pretty awesome.

263
00:16:31,080 --> 00:16:35,080
To turn prototype proficiency into the real deal.

264
00:16:35,080 --> 00:16:38,080
That's a perfect battlefield for a trebuchet, huh?

265
00:16:39,080 --> 00:16:43,080
They're attempting the biggest duct tape assembly in myth Buster history.

266
00:16:44,080 --> 00:16:48,080
Now I know there might be some purists among you who look at this giant stack of wood and think,

267
00:16:48,080 --> 00:16:54,080
duct tape, well, that's mostly wood, and I will remind you, when we built the first duct tape sailboat,

268
00:16:54,080 --> 00:16:56,080
it had a steel frame.

269
00:16:57,080 --> 00:17:02,080
When we escaped from a deserted island in the 20-foot duct tape out of Rigor Canoe,

270
00:17:02,080 --> 00:17:06,080
that also had bamboo as its structural medium.

271
00:17:07,080 --> 00:17:13,080
And so it is in this case of our trebuchet that pine here is our structural member,

272
00:17:13,080 --> 00:17:17,080
but duct tape is our only binder.

273
00:17:17,080 --> 00:17:20,080
No screws, no nothing, just duct tape.

274
00:17:21,080 --> 00:17:25,080
Now this cut list is basically this scaled up times six.

275
00:17:28,080 --> 00:17:29,080
The first cut!

276
00:17:30,080 --> 00:17:35,080
And I've done it using the same lengths of wood, so this right here is our blue duct tape.

277
00:17:36,080 --> 00:17:37,080
Blue print.

278
00:17:41,080 --> 00:17:47,080
With the cuts complete, the building begins with the four triangles that make up the stand.

279
00:17:50,080 --> 00:17:57,080
By exactly following Jamie's 3D blueprint, the main challenge is to ensure the giant jigsaw sticks together.

280
00:17:59,080 --> 00:18:04,080
How much they need is a guessing game, so their strategy is simple.

281
00:18:04,080 --> 00:18:05,080
Ten wraps.

282
00:18:06,080 --> 00:18:13,080
They're going to spread the load and err on the side of caution by using as much duct tape as they possibly can.

283
00:18:13,080 --> 00:18:18,080
This bit in the middle here, this is the business end of what's going on in this structure.

284
00:18:18,080 --> 00:18:21,080
I'm getting kind of psyched to see this out and go.

285
00:18:21,080 --> 00:18:29,080
The weight of the actual swing arm is pushing down on that area, and all that load's going right to that center piece.

286
00:18:31,080 --> 00:18:33,080
Yeah, like Egyptians!

287
00:18:33,080 --> 00:18:36,080
So without the tape, everything falls apart.

288
00:18:39,080 --> 00:18:40,080
Got another roll for me.

289
00:18:41,080 --> 00:18:45,080
To help hold the load bearing triangles in place, thank y'all.

290
00:18:45,080 --> 00:18:49,080
They're using the tape in all its versatile forms.

291
00:18:49,080 --> 00:18:52,080
Recognize this? It's our duct tape rope.

292
00:18:52,080 --> 00:18:57,080
It's made of seven strands of duct tape, all twisted together into one solid rope.

293
00:18:57,080 --> 00:19:01,080
And it'll easily suspend a person, kind of like a climbing rope.

294
00:19:01,080 --> 00:19:04,080
Woo! Oh! Ha!

295
00:19:04,080 --> 00:19:13,080
What it gives us here is the ability to tie it and twist it, because we don't want this stuff to move very much.

296
00:19:13,080 --> 00:19:20,080
With the tape, while it grips, it doesn't really have a lot of squeeze, and we want some squeeze that's what this is going to give us.

297
00:19:21,080 --> 00:19:28,080
What I love about this kind of engineering is trying to physically understand all the forces you're going to be dealing with.

298
00:19:28,080 --> 00:19:31,080
The force is coming this way, and it's going to want to jump out of here.

299
00:19:31,080 --> 00:19:35,080
So the most critical point of failure is right here.

300
00:19:35,080 --> 00:19:41,080
Where the tension's going to be, where things are going to want to fail, where they're going to leap out, and trying to run those off at the pass.

301
00:19:41,080 --> 00:19:43,080
Ain't going nowhere.

302
00:19:43,080 --> 00:19:49,080
It's a deeply pleasurable experience to think through the device, and all the weight and force and torque it's going to be under,

303
00:19:49,080 --> 00:19:52,080
and to try and make an in-run pass around that.

304
00:19:53,080 --> 00:19:55,080
Three, two, one, up!

305
00:19:55,080 --> 00:19:57,080
And here we go.

306
00:19:57,080 --> 00:19:59,080
Watch your feet there, and down.

307
00:19:59,080 --> 00:20:11,080
With the first two triangles tied and taped into submission, and then raised into position, the giant scale of this build comes into perspective.

308
00:20:11,080 --> 00:20:14,080
This is by far the heaviest thing we have ever made out of duct tape.

309
00:20:14,080 --> 00:20:16,080
My way.

310
00:20:16,080 --> 00:20:19,080
Keep coming. Good.

311
00:20:20,080 --> 00:20:22,080
Keep coming. Good. Okay?

312
00:20:22,080 --> 00:20:27,080
And with the second stand standing, it's even more impressive.

313
00:20:30,080 --> 00:20:37,080
But will it stand up to the incredible force of a full-scale medieval weapon of war?

314
00:20:37,080 --> 00:20:40,080
I'm kind of curious about that myself.

315
00:20:41,080 --> 00:20:47,080
With the main structure of our trebuchet completed, it's time for Jamie and I to move on to the axle and the throwing arm,

316
00:20:47,080 --> 00:20:51,080
which is quite literally the business end of a trebuchet.

317
00:20:51,080 --> 00:20:53,080
Critical little bit of engineering.

318
00:20:53,080 --> 00:20:58,080
The amount of stress on that joint is massive.

319
00:20:58,080 --> 00:21:04,080
The technique used to secure the machine's major moving parts is crucial.

320
00:21:04,080 --> 00:21:09,080
The energy transfer and torque through the pivot will be enormous.

321
00:21:09,080 --> 00:21:14,080
And the key to success will be duct tape's ability to stick them together,

322
00:21:14,080 --> 00:21:18,080
the smooth rotation of a soon-to-be rounded axle.

323
00:21:18,080 --> 00:21:23,080
This adds is a tool I made myself.

324
00:21:23,080 --> 00:21:25,080
And the sling.

325
00:21:25,080 --> 00:21:29,080
While Jamie works on the axle, I'm going to be using the sling.

326
00:21:29,080 --> 00:21:32,080
This is the thing that flings.

327
00:21:32,080 --> 00:21:36,080
It's going to be made out of duct tape and it's going to be made out of duct tape rope.

328
00:21:36,080 --> 00:21:41,080
The energy of the trebuchet is distributed to that load and has to throw it.

329
00:21:41,080 --> 00:21:47,080
So this basket has to be very, very, very, very robust.

330
00:21:47,080 --> 00:21:51,080
Duct tape is particularly fantastic as we've learned over the years

331
00:21:51,080 --> 00:21:55,080
for making very smooth and flexible parts of the machine.

332
00:21:55,080 --> 00:21:58,080
It's particularly fantastic as we've learned over the years

333
00:21:58,080 --> 00:22:02,080
for making very strong cloth and tarps,

334
00:22:02,080 --> 00:22:08,080
especially when you put one side up and then stick one side down on top of it.

335
00:22:10,080 --> 00:22:16,080
With the slings suitably secure and the axle rounded and ready to roll,

336
00:22:16,080 --> 00:22:19,080
it's time to join them to the swing arm.

337
00:22:19,080 --> 00:22:20,080
Are they going in?

338
00:22:20,080 --> 00:22:22,080
That is. It's seated nicely.

339
00:22:22,080 --> 00:22:26,080
We're going to make sure that the trebuchet will exert the most strain.

340
00:22:26,080 --> 00:22:31,080
To contain it, the guys continue their duct tape tactic.

341
00:22:31,080 --> 00:22:33,080
Lots of duct tape!

342
00:22:33,080 --> 00:22:36,080
When in doubt, tape it down.

343
00:22:36,080 --> 00:22:40,080
If you're going to make a trebuchet, you're going to need a big weight.

344
00:22:40,080 --> 00:22:42,080
We've got just the thing.

345
00:22:42,080 --> 00:22:46,080
The counterweight, the trebuchet's engine room.

346
00:22:46,080 --> 00:22:51,080
It has to be attached securely enough so that it can be repeatedly raised and dropped,

347
00:22:51,080 --> 00:22:55,080
transferring its gravitational potential to the payload.

348
00:22:55,080 --> 00:22:58,080
We've got two things going on that we have to worry about.

349
00:22:58,080 --> 00:23:01,080
One is the elasticity of this tape.

350
00:23:01,080 --> 00:23:03,080
It stretches.

351
00:23:03,080 --> 00:23:07,080
And the other thing is the shock loading.

352
00:23:07,080 --> 00:23:08,080
Oh yeah!

353
00:23:08,080 --> 00:23:12,080
This engine, once it starts to bounce around from being released,

354
00:23:12,080 --> 00:23:16,080
it's going to weigh many times its weight.

355
00:23:16,080 --> 00:23:18,080
Good? You're looking good?

356
00:23:18,080 --> 00:23:23,080
The fact that there's not a single nail or screw is, well, it's risky.

357
00:23:23,080 --> 00:23:27,080
If anybody's guess whether it's going to work.

358
00:23:27,080 --> 00:23:32,080
With only one less than ideal material to work with.

359
00:23:32,080 --> 00:23:34,080
We've had several lines break.

360
00:23:34,080 --> 00:23:37,080
I'm going to need a lot more of this than I thought I would.

361
00:23:37,080 --> 00:23:39,080
Frustration sets in.

362
00:23:39,080 --> 00:23:40,080
That's not sliding.

363
00:23:40,080 --> 00:23:43,080
No, it's not. What the hell?

364
00:23:43,080 --> 00:23:46,080
The problem right now is that these are too long.

365
00:23:46,080 --> 00:23:50,080
If we start to load this, it is going to stretch.

366
00:23:50,080 --> 00:23:55,080
As they say, no plan survives first contact with implementation.

367
00:23:55,080 --> 00:23:59,080
The problem with that to me is that this thing could then twist against them.

368
00:23:59,080 --> 00:24:01,080
And that's what's happening here.

369
00:24:01,080 --> 00:24:06,080
Eventually, with eight more lengths of rope to further spread the load,

370
00:24:06,080 --> 00:24:08,080
they think they have a working solution.

371
00:24:08,080 --> 00:24:10,080
But will it hold?

372
00:24:16,080 --> 00:24:18,080
This might actually be happening.

373
00:24:18,080 --> 00:24:23,080
Finally, with 73 rolls of the sticky stuff, we have lift off.

374
00:24:23,080 --> 00:24:28,080
But with the light fading, it's over to seat belt central.

375
00:24:30,080 --> 00:24:33,080
Where it's make or break for the tape.

376
00:24:33,080 --> 00:24:38,080
Duck tape is made of a thin layer of polyethylene, a layer of lightweight cloth, and adhesive.

377
00:24:38,080 --> 00:24:39,080
I'm ready.

378
00:24:39,080 --> 00:24:43,080
Now, the manufacturers want you to be able to rip it like so.

379
00:24:43,080 --> 00:24:44,080
It makes it handy.

380
00:24:44,080 --> 00:24:46,080
That also makes it weak.

381
00:24:46,080 --> 00:24:47,080
It's beautiful.

382
00:24:49,080 --> 00:24:50,080
He's dead.

383
00:24:50,080 --> 00:24:53,080
That is, unless you use it in the right way.

384
00:24:53,080 --> 00:24:57,080
If you have an adhesive on something, it means you can put it everywhere.

385
00:24:57,080 --> 00:25:03,080
And the cumulative tensile strength of the tape can be strong enough to do some amazing things.

386
00:25:03,080 --> 00:25:08,080
Will it be strong enough to hold buster in a car crash?

387
00:25:08,080 --> 00:25:10,080
Well, that remains to be seen.

388
00:25:11,080 --> 00:25:17,080
Yep, contrary to the myth, it wasn't strong enough as a like for like seat belt replacement.

389
00:25:17,080 --> 00:25:22,080
But in a new car, Buster and his partner are set for take two.

390
00:25:22,080 --> 00:25:26,080
One crash test down, one broken seat belt.

391
00:25:26,080 --> 00:25:31,080
But this is only one way to use duck tape to hold buster in this car safely.

392
00:25:31,080 --> 00:25:34,080
I'm about to explore another way.

393
00:25:35,080 --> 00:25:37,080
All right, here is the new plan.

394
00:25:37,080 --> 00:25:42,080
Clearly, because the seat belt buckle only fits nine layers, that design is totally out.

395
00:25:42,080 --> 00:25:45,080
I'm now thinking of taping our driver directly to his seat.

396
00:25:45,080 --> 00:25:47,080
Let's call it a body belt.

397
00:25:47,080 --> 00:25:51,080
Two points of contact across the chest, across the pelvis.

398
00:25:51,080 --> 00:25:53,080
Double the layers, at least 18 layers.

399
00:25:53,080 --> 00:25:58,080
Also, I'm not convinced the seat mounts of the seat are strong enough to hold the whole driver.

400
00:25:58,080 --> 00:26:03,080
So I'm also going to anchor him to the body, the frame of the car.

401
00:26:03,080 --> 00:26:05,080
I get another roll.

402
00:26:05,080 --> 00:26:08,080
Is this going to keep our driver in the seat in a car accident?

403
00:26:08,080 --> 00:26:12,080
After seeing how quickly it snapped the nine layers, I'm not sure.

404
00:26:12,080 --> 00:26:14,080
But there's no way to find out but trying.

405
00:26:14,080 --> 00:26:18,080
Look, I'm aware that you might see footage like this.

406
00:26:23,080 --> 00:26:30,080
And conclude that I don't care about Buster's well-being, that I delight in watching him be hurt.

407
00:26:30,080 --> 00:26:33,080
Nice work, Buster. Nice work.

408
00:26:33,080 --> 00:26:38,080
But with someone who didn't care about Buster going to all this length to protect him, I think not.

409
00:26:46,080 --> 00:26:48,080
All right, Mr. Heineman, are you ready?

410
00:26:48,080 --> 00:26:49,080
Set to go.

411
00:26:49,080 --> 00:26:51,080
All right, sir, on your mark.

412
00:26:51,080 --> 00:26:59,080
This is the ultimate duct tape seat belt, 25 mile per hour crash, commencing in three, two, one, go crash.

413
00:27:01,080 --> 00:27:06,080
Car is moving. All right, that's good.

414
00:27:08,080 --> 00:27:12,080
I hear the cable going through the keeper there, moving forward.

415
00:27:12,080 --> 00:27:15,080
Looks like it's going to work beautifully. Here we go.

416
00:27:19,080 --> 00:27:20,080
Awesome.

417
00:27:20,080 --> 00:27:23,080
Better than that, it looks like Buster might have survived in there.

418
00:27:23,080 --> 00:27:26,080
I didn't see him hit the steering wheel.

419
00:27:30,080 --> 00:27:32,080
Here comes the moment of truth.

420
00:27:35,080 --> 00:27:37,080
Yeah, he made it.

421
00:27:37,080 --> 00:27:44,080
Look at, oh my God, it broke the, wow, it broke the wrapping around his belly, but not around his chest.

422
00:27:44,080 --> 00:27:47,080
That is a tremendous amount of force.

423
00:27:52,080 --> 00:27:55,080
Well, yet again, we've totaled the car.

424
00:27:55,080 --> 00:27:59,080
The duct tape seat belt did restrain Buster just.

425
00:27:59,080 --> 00:28:03,080
Now we have to look at the data and see whether he would have survived.

426
00:28:03,080 --> 00:28:08,080
Let's recap the G-loads sustained by Buster and his passenger in crash number one.

427
00:28:08,080 --> 00:28:10,080
You can see the comparisons pretty directly.

428
00:28:10,080 --> 00:28:14,080
The passenger survives as you'd expect with the seat belt and Buster dies.

429
00:28:14,080 --> 00:28:17,080
Now let's look at the passenger for crash number two.

430
00:28:17,080 --> 00:28:21,080
Those numbers are almost identical to crash number one, which is what we'd expect from a control.

431
00:28:21,080 --> 00:28:22,080
That's awesome.

432
00:28:22,080 --> 00:28:28,080
Now let's look at Buster's number and we see, oh, it is confirmed by the accelerometers that the seat belt made of duct tape

433
00:28:28,080 --> 00:28:31,080
saved Buster's life in that car accident.

434
00:28:31,080 --> 00:28:34,080
That is pretty remarkable and awesome.

435
00:28:34,080 --> 00:28:36,080
That's duct tape.

436
00:28:37,080 --> 00:28:41,080
But this tall tail of the tape is far from finished.

437
00:28:44,080 --> 00:28:50,080
To conclusively prove its crash-proof credentials, there's a need for more speed.

438
00:28:51,080 --> 00:28:52,080
Come on, baby!

439
00:28:59,080 --> 00:29:10,080
For this last test, we're going to really up the ante by bringing the car up to 40 miles per hour,

440
00:29:10,080 --> 00:29:13,080
which is the industry standard for this kind of thing.

441
00:29:13,080 --> 00:29:15,080
Now it doesn't sound like that much.

442
00:29:15,080 --> 00:29:18,080
It's only 15 miles per hour faster than what we did before.

443
00:29:18,080 --> 00:29:25,080
But the formula force equals mass times acceleration dictates that we're going to actually more than double that impact

444
00:29:25,080 --> 00:29:29,080
and that's going to make a dramatic difference to Buster and his seat belt.

445
00:29:29,080 --> 00:29:35,080
So last time, I localized the belts into two main straps and both of them failed.

446
00:29:35,080 --> 00:29:38,080
The first one completely, the second one about 85%.

447
00:29:38,080 --> 00:29:41,080
I don't think I want to make the same mistake on this one.

448
00:29:42,080 --> 00:29:46,080
Yep, this time Adam's going for a full torso wrap.

449
00:29:46,080 --> 00:29:53,080
And in line with the crash energy increase, he's using 40 layers, more than twice as much as last time.

450
00:29:55,080 --> 00:29:57,080
I think it's going to be enough.

451
00:29:57,080 --> 00:29:59,080
Personally, I'm not so sure.

452
00:30:01,080 --> 00:30:06,080
There they go, the Buster's off to risk life and fake limbs for science.

453
00:30:09,080 --> 00:30:11,080
Makes me a little misty.

454
00:30:17,080 --> 00:30:19,080
Alright, sir, on my mark, this is...

455
00:30:20,080 --> 00:30:30,080
Duck tape, seat belt, 40 mile per hour crash in three, two, one, drive.

456
00:30:32,080 --> 00:30:34,080
Jamie's moving.

457
00:30:34,080 --> 00:30:36,080
Campbell's tensing up, car's moving.

458
00:30:36,080 --> 00:30:38,080
Alright, Jamie's going.

459
00:30:38,080 --> 00:30:40,080
He's giving it some gas.

460
00:30:41,080 --> 00:30:43,080
Oh man, this is exciting.

461
00:30:45,080 --> 00:30:47,080
40 miles an hour.

462
00:30:47,080 --> 00:30:49,080
Come on, baby.

463
00:30:51,080 --> 00:30:53,080
A perfect hit.

464
00:30:53,080 --> 00:30:54,080
Beautiful.

465
00:30:54,080 --> 00:30:56,080
Our barrier's stayed, the car has crashed.

466
00:30:56,080 --> 00:30:58,080
Doesn't look like we broke anything.

467
00:30:58,080 --> 00:31:00,080
Let's go see how we did.

468
00:31:05,080 --> 00:31:07,080
Dude, dude.

469
00:31:10,080 --> 00:31:11,080
Duck tape held.

470
00:31:11,080 --> 00:31:12,080
It looks like it held.

471
00:31:12,080 --> 00:31:14,080
It doesn't look like it's broken on either side.

472
00:31:14,080 --> 00:31:16,080
He did not hit the steering wheel.

473
00:31:16,080 --> 00:31:19,080
And this was a more severe impact, clearly.

474
00:31:21,080 --> 00:31:28,080
During this collision, more than twice as much force was required to stop Buster from flying through the windshield.

475
00:31:28,080 --> 00:31:30,080
And that duck tape held.

476
00:31:30,080 --> 00:31:32,080
Great news for the myth?

477
00:31:32,080 --> 00:31:36,080
Well, according to the accelerometers, not so much.

478
00:31:36,080 --> 00:31:40,080
So Buster's duck tape seat belt held in a 40 mile per hour collision.

479
00:31:40,080 --> 00:31:42,080
It is a miracle material.

480
00:31:42,080 --> 00:31:45,080
Does that mean that we should all be driving around with duck tape seat belts?

481
00:31:45,080 --> 00:31:47,080
Well, no.

482
00:31:47,080 --> 00:31:49,080
Here's the thing about a seat belt.

483
00:31:49,080 --> 00:31:52,080
A seat belt gives a little in a car accident.

484
00:31:52,080 --> 00:31:54,080
It actually allows you to move a little bit.

485
00:31:54,080 --> 00:31:57,080
And that is one of the ways it keeps you alive.

486
00:31:57,080 --> 00:32:03,080
Unfortunately, I tie Buster to this chair and to the body of this car with so much rigidity

487
00:32:03,080 --> 00:32:08,080
that a tremendous amount of the force of the accident was transferred right to Buster's torso.

488
00:32:08,080 --> 00:32:12,080
And unfortunately, we have to say that Buster here is totally dead.

489
00:32:13,080 --> 00:32:16,080
Yep, the duck tape worked too well.

490
00:32:16,080 --> 00:32:22,080
There was no give and Buster's instant deceleration was catastrophic.

491
00:32:22,080 --> 00:32:28,080
As versatile as it is, it simply cannot replicate a real seat belt.

492
00:32:28,080 --> 00:32:33,080
Speaking of which, the control seat belt turned out to be faulty.

493
00:32:33,080 --> 00:32:37,080
That right there is where control Buster hit his head.

494
00:32:37,080 --> 00:32:46,080
Unfortunately, the seat belt didn't hold and he experienced 475 G's, which is entirely lethal.

495
00:32:46,080 --> 00:32:52,080
It just goes to show even a 40 mile an hour crash, it's going to kill you without some form of restraint.

496
00:32:52,080 --> 00:32:59,080
You know, it's funny when we started this, I didn't expect we'd end up at a point where duck tape actually worked and yet still killed it.

497
00:32:59,080 --> 00:33:02,080
Maybe we should have made duck tape airbags.

498
00:33:03,080 --> 00:33:10,080
In this final season spectacular, duck tape has one last chance at glory.

499
00:33:10,080 --> 00:33:13,080
Right, here's where we currently stand.

500
00:33:13,080 --> 00:33:24,080
2600 pounds of pine board, 78 rolls of duck tape, our stands are up, the axle is properly attached.

501
00:33:24,080 --> 00:33:26,080
It's working beautifully!

502
00:33:27,080 --> 00:33:32,080
And it also has a 750 pound engine block hanging from the backside.

503
00:33:32,080 --> 00:33:34,080
I can't see any reason this won't work.

504
00:33:34,080 --> 00:33:36,080
Nice and easy, no jerking.

505
00:33:36,080 --> 00:33:41,080
At this point, the only thing left to do, it's bending but it's not splitting.

506
00:33:41,080 --> 00:33:42,080
That is scary.

507
00:33:42,080 --> 00:33:46,080
It's attached to the sling and tried to sting out for the first time.

508
00:33:46,080 --> 00:33:48,080
A little more, a little more, one more inch.

509
00:33:48,080 --> 00:33:50,080
We're clipped in.

510
00:33:50,080 --> 00:33:55,080
I've never built a weapon of war this capable before.

511
00:33:55,080 --> 00:34:00,080
Let go slowly and back away, this may snap, especially when out of duck tape.

512
00:34:02,080 --> 00:34:05,080
A little closer we get, the scarier it gets.

513
00:34:05,080 --> 00:34:10,080
I'm in this point where I'm getting very excited, can you tell?

514
00:34:10,080 --> 00:34:18,080
With the trebuchet locked into firing position, it's clear that this is the duck tape build to end all duck tape builds.

515
00:34:18,080 --> 00:34:25,080
In size, engineering complexity and sheer ambition, it tops the lot.

516
00:34:25,080 --> 00:34:27,080
Sir, there's nothing left to do but fire, are you ready?

517
00:34:27,080 --> 00:34:29,080
Let's load the gun.

518
00:34:29,080 --> 00:34:32,080
First up, a test with that most medieval of ammo.

519
00:34:32,080 --> 00:34:33,080
Our first ammo.

520
00:34:33,080 --> 00:34:35,080
A melon.

521
00:34:35,080 --> 00:34:38,080
I do not like being here.

522
00:34:38,080 --> 00:34:39,080
Okay.

523
00:34:39,080 --> 00:34:40,080
Looks good.

524
00:34:40,080 --> 00:34:41,080
That's loaded.

525
00:34:44,080 --> 00:34:45,080
You ready?

526
00:34:45,080 --> 00:34:46,080
I'm ready.

527
00:34:46,080 --> 00:34:48,080
Now safety is out.

528
00:34:48,080 --> 00:34:50,080
Let's retreat to a safe distance.

529
00:34:52,080 --> 00:34:54,080
First firing of the duck tape trebuchet.

530
00:34:54,080 --> 00:35:00,080
In three, two, one.

531
00:35:03,080 --> 00:35:04,080
Hold!

532
00:35:06,080 --> 00:35:07,080
Yeah!

533
00:35:07,080 --> 00:35:18,080
The fears of a catastrophic failure dispelled.

534
00:35:18,080 --> 00:35:21,080
Boy, it was so sort of gentle watching it do its thing.

535
00:35:21,080 --> 00:35:27,080
In the elegant, effortless action of the trebuchet and flight of a watermelon.

536
00:35:29,080 --> 00:35:30,080
It went a good ways.

537
00:35:30,080 --> 00:35:31,080
It did!

538
00:35:31,080 --> 00:35:36,080
171 feet.

539
00:35:43,080 --> 00:35:47,080
That's a successful firing of a duck tape trebuchet.

540
00:35:47,080 --> 00:35:49,080
And nothing fell apart.

541
00:35:49,080 --> 00:35:51,080
On closer inspection.

542
00:35:51,080 --> 00:35:53,080
Hey, Adam, we've lost one line.

543
00:35:53,080 --> 00:35:54,080
What?

544
00:35:54,080 --> 00:35:56,080
The strain did tell on the tape.

545
00:35:56,080 --> 00:35:57,080
Right there.

546
00:35:57,080 --> 00:35:58,080
Oh, ****.

547
00:35:58,080 --> 00:36:01,080
But all in all, the test fire was a success.

548
00:36:01,080 --> 00:36:02,080
Coming up.

549
00:36:02,080 --> 00:36:04,080
Duck tape trebuchet!

550
00:36:04,080 --> 00:36:06,080
Flaming ball of awesome!

551
00:36:06,080 --> 00:36:10,080
Their choice of ammo gets a little more medieval.

552
00:36:10,080 --> 00:36:11,080
One!

553
00:36:17,080 --> 00:36:22,080
To celebrate the final season, this is the final season of the Duck Tape.

554
00:36:23,080 --> 00:36:29,080
To celebrate the final season, this is the Mythbusters number crunching countdown.

555
00:36:31,080 --> 00:36:32,080
Duck tape.

556
00:36:32,080 --> 00:36:38,080
That most miraculous of engineering marvels has not only been the focus of 24 stories,

557
00:36:38,080 --> 00:36:43,080
it's been crucial to virtually every myth the team has tackled.

558
00:36:46,080 --> 00:36:48,080
It's built five boats.

559
00:36:48,080 --> 00:36:49,080
Yeah!

560
00:36:49,080 --> 00:36:53,080
One bridge and several hats.

561
00:36:53,080 --> 00:36:56,080
Almost 5,000 rolls.

562
00:36:56,080 --> 00:37:01,080
More than 83 miles of the sticky stuff have been pressed into service for science.

563
00:37:01,080 --> 00:37:02,080
Cheers!

564
00:37:02,080 --> 00:37:03,080
Duck tape.

565
00:37:03,080 --> 00:37:05,080
Resolute you.

566
00:37:06,080 --> 00:37:21,080
This is Duck Tape's final season, final fling.

567
00:37:23,080 --> 00:37:29,080
To fully test this tape trebuchet held together without a single screw or bolt,

568
00:37:29,080 --> 00:37:32,080
they need to prove it's fully operational.

569
00:37:32,080 --> 00:37:36,080
Capable of serving up a cocktail of death and destruction.

570
00:37:36,080 --> 00:37:39,080
We're very happy with how the trebuchet is going.

571
00:37:39,080 --> 00:37:45,080
And I love Duck Tape, but I have to admit to you, it is not the ideal material to build a trebuchet out of.

572
00:37:45,080 --> 00:37:48,080
Trebuchet is hot, you want to set the bottle?

573
00:37:48,080 --> 00:37:52,080
And this device is still very, very dangerous, even standing still.

574
00:37:52,080 --> 00:37:53,080
Beauty.

575
00:37:53,080 --> 00:37:58,080
And now that we're adding flaming gasoline, malt-hub cocktails to the mix.

576
00:37:58,080 --> 00:37:59,080
Jamie, you ready?

577
00:37:59,080 --> 00:38:01,080
All right, here we go.

578
00:38:01,080 --> 00:38:02,080
Hold the safety.

579
00:38:02,080 --> 00:38:05,080
The danger quotient is going up exponentially.

580
00:38:05,080 --> 00:38:06,080
Trebuchet is hot!

581
00:38:06,080 --> 00:38:10,080
And it is the very reason why I am dressed for success in a proximity suit.

582
00:38:10,080 --> 00:38:12,080
Lighting the fuse.

583
00:38:12,080 --> 00:38:20,080
I will be zipped up to light the malt-hub cocktail, but I will also be standing at the ready to put out anything that's burning.

584
00:38:20,080 --> 00:38:22,080
Relit, back to the trigger.

585
00:38:22,080 --> 00:38:25,080
Well, more specifically, anything that's burning that we didn't intend to burn.

586
00:38:25,080 --> 00:38:29,080
The stuff we want to burn, we're just going to go get some marshmallows and watch it.

587
00:38:30,080 --> 00:38:31,080
All right.

588
00:38:31,080 --> 00:38:33,080
Duct tape trebuchet.

589
00:38:33,080 --> 00:38:35,080
Flaming ball of awesome.

590
00:38:35,080 --> 00:38:36,080
Here we go.

591
00:38:36,080 --> 00:38:41,080
In three, two, one.

592
00:38:42,080 --> 00:38:44,080
Yeah!

593
00:38:48,080 --> 00:38:49,080
Woo!

594
00:38:49,080 --> 00:38:50,080
That was a good one.

595
00:38:50,080 --> 00:39:03,080
A medieval weapon of war held together by duct tape spreads fire and fury.

596
00:39:03,080 --> 00:39:06,080
Surely a world first.

597
00:39:12,080 --> 00:39:13,080
Ha ha ha ha!

598
00:39:13,080 --> 00:39:16,080
Now we need something to burn to the ground.

599
00:39:16,080 --> 00:39:23,080
Now we can use the trebuchet to hit something.

600
00:39:23,080 --> 00:39:26,080
Yeah, the fire was never an end in and of itself.

601
00:39:28,080 --> 00:39:32,080
We always intended to set something on fire.

602
00:39:32,080 --> 00:39:34,080
All right, perfect.

603
00:39:34,080 --> 00:39:36,080
It's a weapon of war.

604
00:39:36,080 --> 00:39:38,080
We've got to use it to destroy something.

605
00:39:38,080 --> 00:39:41,080
And oh boy, did we find something fun to destroy.

606
00:39:43,080 --> 00:39:44,080
Yeah!

607
00:39:45,080 --> 00:39:48,080
My crew hasn't told me what this looks like.

608
00:39:48,080 --> 00:39:50,080
They just said it's not a castle.

609
00:39:50,080 --> 00:39:52,080
Oh yeah!

610
00:39:52,080 --> 00:39:54,080
What the hell is this thing?

611
00:39:54,080 --> 00:39:55,080
Wow!

612
00:39:55,080 --> 00:39:58,080
Some giant slide.

613
00:39:58,080 --> 00:39:59,080
What the hell?

614
00:39:59,080 --> 00:40:00,080
Woo hoo!

615
00:40:00,080 --> 00:40:01,080
Ha ha ha ha!

616
00:40:01,080 --> 00:40:02,080
Oh ha ha ha!

617
00:40:02,080 --> 00:40:06,080
Is this possible that we got a giant inflatable shark?

618
00:40:06,080 --> 00:40:08,080
That's freaking awesome.

619
00:40:09,080 --> 00:40:10,080
Woo!

620
00:40:10,080 --> 00:40:11,080
Whoa!

621
00:40:11,080 --> 00:40:12,080
Whoa!

622
00:40:12,080 --> 00:40:13,080
Ha ha ha!

623
00:40:13,080 --> 00:40:14,080
Woo!

624
00:40:15,080 --> 00:40:16,080
Woo!

625
00:40:16,080 --> 00:40:21,080
Well, it's a little random, but it definitely deserves to be destroyed.

626
00:40:25,080 --> 00:40:28,080
In a couple of minutes, we're going to finally answer the question,

627
00:40:28,080 --> 00:40:32,080
can a duct tape trebuchet be a viable weapon of war?

628
00:40:34,080 --> 00:40:35,080
Lighting her up.

629
00:40:35,080 --> 00:40:36,080
There you go.

630
00:40:36,080 --> 00:40:39,080
Can it actually take out a target?

631
00:40:40,080 --> 00:40:41,080
We're lit!

632
00:40:42,080 --> 00:40:43,080
We are hot!

633
00:40:43,080 --> 00:40:47,080
In a moment, we're going to find out just how good a weapon of war it actually is.

634
00:40:47,080 --> 00:40:49,080
Ha ha ha ha ha ha!

635
00:40:50,080 --> 00:40:51,080
Woo hoo!

636
00:40:52,080 --> 00:40:53,080
Okay, here we go.

637
00:40:53,080 --> 00:41:02,080
Dug tape trebuchet, the final warmongering blast in three, two, one, pull!

638
00:41:05,080 --> 00:41:06,080
Yeah!

639
00:41:06,080 --> 00:41:07,080
That's it!

640
00:41:08,080 --> 00:41:09,080
Yeah!

641
00:41:09,080 --> 00:41:11,080
We hit it!

642
00:41:11,080 --> 00:41:13,080
It's burning!

643
00:41:14,080 --> 00:41:15,080
She burns!

644
00:41:17,080 --> 00:41:18,080
Wow.

645
00:41:18,080 --> 00:41:20,080
That's going up in a hurry.

646
00:41:20,080 --> 00:41:21,080
Oh, yeah!

647
00:41:23,080 --> 00:41:26,080
That is the last inflatable shark that will f*** with us!

648
00:41:28,080 --> 00:41:33,080
It's actually pretty impressive because here's thousands of pounds of wood,

649
00:41:33,080 --> 00:41:37,080
a throwing arm that's moving violently that weighs hundreds of pounds,

650
00:41:37,080 --> 00:41:39,080
and it's holding on to an engine block.

651
00:41:39,080 --> 00:41:43,080
And yet, there's not a single screw, no pins.

652
00:41:43,080 --> 00:41:47,080
There's nothing but tape holding this machine together.

653
00:41:49,080 --> 00:41:51,080
Best day ever!

654
00:41:51,080 --> 00:41:55,080
And so, as far as I'm concerned, for what it is, it's darn near perfect.

655
00:41:55,080 --> 00:41:56,080
Hey!

656
00:41:56,080 --> 00:41:58,080
Nice work there, sir.

657
00:41:58,080 --> 00:42:07,080
And I can't think of a more dramatic way of demonstrating just how strong something as simple as tape can actually be if it's applied in the right way.

658
00:42:07,080 --> 00:42:13,080
In 14 years, the Mythbusters have made a myriad of marvels with this miracle material.

659
00:42:13,080 --> 00:42:21,080
But with this one monstrous medieval weapon of war, they've stretched duct tape to its absolute limit.

660
00:42:21,080 --> 00:42:23,080
What a way to sign off.