1 00:00:00,000 --> 00:00:04,000 Attention viewers, do not try anything you're about to see at home. 2 00:00:04,000 --> 00:00:07,000 We're what you call experts. 3 00:00:10,000 --> 00:00:13,000 On this high velocity episode of Mythbusters... 4 00:00:13,000 --> 00:00:15,000 You killed the dwarf! 5 00:00:15,000 --> 00:00:19,000 Adam and Jamie investigate yet another way your car could kill you. 6 00:00:19,000 --> 00:00:21,000 This is fun. 7 00:00:21,000 --> 00:00:25,000 As they test the myth of exploding crumpers. 8 00:00:25,000 --> 00:00:27,000 Now this is actually really scary. 9 00:00:27,000 --> 00:00:29,000 It's hot, smelly, dangerous word. 10 00:00:29,000 --> 00:00:31,000 We're fully armed. 11 00:00:31,000 --> 00:00:33,000 And that's the way we like it. 12 00:00:36,000 --> 00:00:40,000 Then, Kari, Tori and Grant are on the edge of their saddle. 13 00:00:40,000 --> 00:00:42,000 Yeah, got him! 14 00:00:42,000 --> 00:00:45,000 As they challenge an awesome myth of medieval cavalry. 15 00:00:45,000 --> 00:00:47,000 You're going the wrong way! 16 00:00:47,000 --> 00:00:52,000 Can an expertly fired arrow really penetrate double deep with a galloping start? 17 00:00:52,000 --> 00:00:56,000 And how far will they go to prove the point? 18 00:00:56,000 --> 00:00:58,000 We're all in quiver. 19 00:01:00,000 --> 00:01:02,000 Who are the Mythbusters? 20 00:01:02,000 --> 00:01:04,000 Adam Savage. 21 00:01:04,000 --> 00:01:06,000 I ate a radio for science. 22 00:01:06,000 --> 00:01:08,000 And Jamie Heidemann. 23 00:01:08,000 --> 00:01:10,000 I'll deflect the ball. 24 00:01:10,000 --> 00:01:14,000 Between them more than 30 years of special effects experience. 25 00:01:14,000 --> 00:01:16,000 There's your problem. 26 00:01:16,000 --> 00:01:19,000 Joining them, Tori Belleggi. 27 00:01:19,000 --> 00:01:21,000 Punch through! 28 00:01:21,000 --> 00:01:22,000 Grant Imahara. 29 00:01:22,000 --> 00:01:24,000 That's right. I'm going to build a robot. 30 00:01:24,000 --> 00:01:25,000 And Kari Byron. 31 00:01:25,000 --> 00:01:27,000 This is going to be a whole lot of fun, huh? 32 00:01:27,000 --> 00:01:29,000 They don't just tell the myths. 33 00:01:29,000 --> 00:01:31,000 They put them to the test. 34 00:01:46,000 --> 00:01:48,000 What are you doing? 35 00:01:48,000 --> 00:01:52,000 Is it time for like fire safety tips or something? 36 00:01:52,000 --> 00:01:58,000 In fact it is. Today's fire safety tip is don't stand near a car that's on fire. 37 00:01:58,000 --> 00:02:00,000 Okay. Why? 38 00:02:00,000 --> 00:02:02,000 Alright. I'm glad you asked. 39 00:02:02,000 --> 00:02:06,000 Because it turns out that some cars have a bumper attached to them by a shock absorber. 40 00:02:06,000 --> 00:02:10,000 And this is to allow the bumper to absorb some of the hit when it bumps into something. 41 00:02:10,000 --> 00:02:13,000 And that in a car fire that shock absorber can overheat and explode. 42 00:02:13,000 --> 00:02:21,000 And send the bumper shooting out potentially knee capping anybody who's unfortunate enough to be standing in front of or behind the car on fire. 43 00:02:21,000 --> 00:02:24,000 I sense a car fire in our near future. 44 00:02:24,000 --> 00:02:26,000 I think it's definitely something we should test. 45 00:02:26,000 --> 00:02:27,000 Okay. 46 00:02:27,000 --> 00:02:33,000 Bumpers are designed to protect your car by absorbing some of the impact from a low speed collision. 47 00:02:33,000 --> 00:02:42,000 But if your car's on fire, this myth contends that the gas filled pistons can heat up to a point where the bumper becomes a deadly projectile. 48 00:02:42,000 --> 00:02:46,000 And its range is an incredible 50 feet. 49 00:02:46,000 --> 00:02:49,000 As far as the methodology goes, I think it's pretty straightforward. 50 00:02:49,000 --> 00:02:55,000 We just go to a junkyard, we get some bumpers of the appropriate type, we subject them to some really high heat and we test them. 51 00:02:55,000 --> 00:03:08,000 Right. But since this whole thing is about what happens to these bumpers in a car fire, I think our very first step is to simply set a car on fire and take some measurements and readings to figure out what kind of temperatures we're actually talking about. 52 00:03:08,000 --> 00:03:09,000 Agreed. 53 00:03:10,000 --> 00:03:14,000 So the boys bolt up to the bomb range to set a car on fire. 54 00:03:14,000 --> 00:03:17,000 This is familiar Mythbusters territory. 55 00:03:17,000 --> 00:03:19,000 So how hard can it be? 56 00:03:19,000 --> 00:03:21,000 Well, as hard as you want to make it. 57 00:03:27,000 --> 00:03:28,000 We're all right. 58 00:03:28,000 --> 00:03:30,000 What the hell are you doing? 59 00:03:30,000 --> 00:03:32,000 Having some fun. 60 00:03:32,000 --> 00:03:37,000 Jamie's idea of fun is likely different to yours, mine and Adam's. 61 00:03:37,000 --> 00:03:40,000 But you really can get in trouble with one of these things. 62 00:03:43,000 --> 00:03:47,000 It's an app start to a day that will not go quite to plan. 63 00:03:47,000 --> 00:03:50,000 We have found some potential cases of this actually happening. 64 00:03:50,000 --> 00:03:57,000 Maybe bumpers shot off during car fires and the researchers have found us a make and model similar to those in the reports that we have. 65 00:03:57,000 --> 00:04:04,000 So we're going to set this thing on fire, find out how hot a car fire actually gets, take temperature readings all around it. 66 00:04:04,000 --> 00:04:08,000 And if we're very lucky, maybe we'll get a bumper shooting off. 67 00:04:08,000 --> 00:04:10,000 That would be a bonus. 68 00:04:10,000 --> 00:04:15,000 But remember, their primary purpose is to see just how hot a car fire gets. 69 00:04:15,000 --> 00:04:18,000 Fortunately, there's some adult supervision on hand. 70 00:04:18,000 --> 00:04:19,000 Good morning. 71 00:04:19,000 --> 00:04:23,000 We got just a smoke car fire we're going to set and hopefully help ask you guys to put out. 72 00:04:23,000 --> 00:04:25,000 No problem, sir. 73 00:04:25,000 --> 00:04:31,000 Adam draws on boyhood skills to raise the car and strip the wheels in next to no time. 74 00:04:31,000 --> 00:04:34,000 Here in California, it's a crime to burn tires. 75 00:04:34,000 --> 00:04:39,000 For some reason, it's not a crime to wear a silver suit with suspenders. 76 00:04:39,000 --> 00:04:44,000 As Adam slips into something less comfortable, Jamie considers the finer details. 77 00:04:44,000 --> 00:04:51,000 We're going to light the car on fire and being as the engine has fuel, it has oil, it has plastic parts. 78 00:04:51,000 --> 00:04:55,000 It's got batteries with electricity. 79 00:04:55,000 --> 00:04:58,000 You've got all the elements you need to create an energetic fire. 80 00:04:58,000 --> 00:05:01,000 And that also happens to be the area around the bumper. 81 00:05:01,000 --> 00:05:06,000 So that's where we're going to focus our ignition and we'll see what happens. 82 00:05:06,000 --> 00:05:14,000 And just for good measure, when the car is ablaze, they'll get accurate temperature measurements 83 00:05:14,000 --> 00:05:17,000 by circling it with a thermal imaging camera. 84 00:05:17,000 --> 00:05:19,000 That ought to do. What do you think? 85 00:05:19,000 --> 00:05:21,000 Go for it. 86 00:05:21,000 --> 00:05:23,000 This is fun. 87 00:05:23,000 --> 00:05:27,000 But try as he might, Adam can't manage to set fire to the engine. 88 00:05:27,000 --> 00:05:31,000 Even though it's swimming in gasoline. 89 00:05:31,000 --> 00:05:35,000 Making fire is something even cavemen master. 90 00:05:35,000 --> 00:05:37,000 But we've struggled with this before. 91 00:05:37,000 --> 00:05:41,000 Who could forget the shaky start to trailblazers? 92 00:05:41,000 --> 00:05:45,000 It's hard to stuff the light. 93 00:05:45,000 --> 00:05:49,000 It only lights when it gets mystified. 94 00:05:49,000 --> 00:05:55,000 This delayed ignition is risky business and statistically, it's getting more perilous by the second. 95 00:05:55,000 --> 00:05:59,000 I mean, nothing's gone wrong for almost 40 minutes. 96 00:05:59,000 --> 00:06:02,000 Whoa! 97 00:06:02,000 --> 00:06:05,000 I'm okay. 98 00:06:05,000 --> 00:06:07,000 You've got a little bit of a haircut there, didn't you? 99 00:06:07,000 --> 00:06:13,000 I've got a little bit of a... not a haircut, I've got a little bit of a hair on the back of my hand. 100 00:06:13,000 --> 00:06:20,000 Considering the rough start, the cars quickly engulfed in flames. 101 00:06:20,000 --> 00:06:23,000 It's all happening a lot faster than I thought it would. 102 00:06:23,000 --> 00:06:26,000 That's one out of control car park. 103 00:06:26,000 --> 00:06:29,000 You were afraid that it was going to burn itself out. 104 00:06:29,000 --> 00:06:33,000 As the wind shifts, Adam's forced to move the thermal camera 20 feet to the left. 105 00:06:33,000 --> 00:06:41,000 Any thoughts of certain ablaze are abandoned as the flames follow the smoke in an unpredictable arc. 106 00:06:41,000 --> 00:06:43,000 Are you getting any kind of a reading yet? 107 00:06:43,000 --> 00:06:47,000 Yeah, I'm actually getting, you know, easily a thousand degrees. 108 00:06:47,000 --> 00:06:48,000 Okay. 109 00:06:48,000 --> 00:06:51,000 1,050, 1,100. 110 00:06:51,000 --> 00:06:54,000 It's hot. 111 00:06:54,000 --> 00:06:59,000 At this point, a bumper flying 50 feet would confirm the myth. 112 00:06:59,000 --> 00:07:05,000 The skipper and Gilligan could high five each other, share a man hug, and head home. 113 00:07:05,000 --> 00:07:10,000 But it's just not that kind of a day. 114 00:07:10,000 --> 00:07:12,000 Well, our pistons are still there. 115 00:07:12,000 --> 00:07:15,000 But the bumper is melted. 116 00:07:15,000 --> 00:07:19,000 And that actually tells us something about what temperatures were achieved, 117 00:07:19,000 --> 00:07:25,000 because the bumpers are aluminum and aluminum melts at around 660 Celsius. 118 00:07:25,000 --> 00:07:27,000 Well, riddle me this Batman. 119 00:07:27,000 --> 00:07:29,000 What's the melting point of glass? 120 00:07:29,000 --> 00:07:30,000 Look at that. 121 00:07:30,000 --> 00:07:32,000 You never see anything like that. 122 00:07:32,000 --> 00:07:37,000 That's even hotter because that melts at around 1400 Celsius. 123 00:07:37,000 --> 00:07:43,000 There's no doubt they had the heat, an impressive 1400 degrees Celsius. 124 00:07:43,000 --> 00:07:45,000 And that's what they came here to measure. 125 00:07:45,000 --> 00:07:48,000 Still, the bumpers didn't go ballistic. 126 00:07:48,000 --> 00:07:50,000 Of course, they're designed not to. 127 00:07:50,000 --> 00:07:54,000 But there are those who swear they've seen this myth in action. 128 00:07:54,000 --> 00:08:01,000 What this tells us is that this is a very, very specific set of circumstances that is required to make this happen. 129 00:08:01,000 --> 00:08:06,000 I think now we've got to go back to the shop, work on some individual shocks, 130 00:08:06,000 --> 00:08:09,000 heating them and seeing what kind of results we can get. 131 00:08:09,000 --> 00:08:11,000 So how's your hand? 132 00:08:11,000 --> 00:08:14,000 It hurts a little bit, but it'll be better by tomorrow. 133 00:08:14,000 --> 00:08:15,000 And you've got another one. 134 00:08:15,000 --> 00:08:17,000 I do. 135 00:08:18,000 --> 00:08:23,000 Shortly, Adam and Jamie take this dangerous testing indoors. 136 00:08:23,000 --> 00:08:25,000 Right there is a pipe bomb. 137 00:08:25,000 --> 00:08:31,000 But next, Tori, Grant and Carrie take aim at the myth of double deadly medieval arrows. 138 00:08:31,000 --> 00:08:33,000 Yeah! 139 00:08:42,000 --> 00:08:46,000 You know, you guys, ever since we did Huacha, I've really wanted to do some more medieval weaponry myths. 140 00:08:46,000 --> 00:08:51,000 That is perfect because we have one that comes out of the Hungarian army during the 1500s. 141 00:08:51,000 --> 00:08:55,000 Now, apparently they believe that an archer riding on the back of a galloping horse, 142 00:08:55,000 --> 00:09:01,000 if he were to shoot an arrow, that arrow would have twice the penetrating power as an archer firing an arrow standing still. 143 00:09:01,000 --> 00:09:03,000 Sounds like a myth to me. 144 00:09:03,000 --> 00:09:04,000 I know, it's hard to believe, right? 145 00:09:04,000 --> 00:09:07,000 Physics, history, let's do it. 146 00:09:07,000 --> 00:09:09,000 Two of my worst subjects. 147 00:09:09,000 --> 00:09:14,000 Back in the 1500s, Hungarian archers were the most skilled and feared warriors in Europe. 148 00:09:14,000 --> 00:09:18,000 In fact, archery was practiced as a martial art. 149 00:09:18,000 --> 00:09:24,000 And the boldest claim made by these master bowmen was that they could actually get twice the penetration 150 00:09:24,000 --> 00:09:28,000 when the arrow was shot from the back of a galloping horse. 151 00:09:28,000 --> 00:09:32,000 Okay, so it sounds like we need to get our hands on a medieval-style bow, 152 00:09:32,000 --> 00:09:37,000 fire arrows at the target from a stationary position, and then gallop at the target and fire arrows again. 153 00:09:37,000 --> 00:09:42,000 Right, well then we'll look at the two sets of arrows and see which ones go deeper into the target. 154 00:09:42,000 --> 00:09:46,000 Wait a minute, so if you're firing a bow from the top of the horse, 155 00:09:46,000 --> 00:09:51,000 that means you have no hands to hold on to the reins, and don't they gallop at like 40 miles an hour? 156 00:09:51,000 --> 00:09:54,000 Exactly, that's why you have to be an expert horse rider. 157 00:09:54,000 --> 00:09:56,000 What could possibly go wrong? 158 00:09:57,000 --> 00:10:01,000 Custer's very words to the 7th Cavalry at Little Bighorn. 159 00:10:01,000 --> 00:10:06,000 The team has wisely chosen a venue that specializes in mounted archery. 160 00:10:08,000 --> 00:10:11,000 We're doing a little squeeze and a click. 161 00:10:12,000 --> 00:10:15,000 That way, that way, yeah. 162 00:10:15,000 --> 00:10:18,000 Okay, that wasn't the way I wanted to go. 163 00:10:18,000 --> 00:10:22,000 He's got steering, it's just not power steering. That way, hard left. 164 00:10:22,000 --> 00:10:28,000 Forget archery at the gallop. Let's see if these amateur light horsemen can shoot from a saunter. 165 00:10:28,000 --> 00:10:30,000 I think we're ready to attack. 166 00:10:30,000 --> 00:10:32,000 Grant's the first to try his luck. 167 00:10:37,000 --> 00:10:39,000 Interesting strategy, Grant. 168 00:10:39,000 --> 00:10:41,000 Interesting isn't quite the word. 169 00:10:41,000 --> 00:10:44,000 Grant, you're going the wrong way. Attack! 170 00:10:44,000 --> 00:10:50,000 A man with a drawn bow on a wayward horse is a deadly threat to all and sundry. 171 00:10:50,000 --> 00:10:54,000 Choose the horse, Grant. Choose the horse. 172 00:10:54,000 --> 00:10:55,000 Oh! 173 00:10:55,000 --> 00:11:01,000 More by good luck than good management, the horse eventually turns toward the target. 174 00:11:01,000 --> 00:11:03,000 Try not to shoot the horse in the head. 175 00:11:04,000 --> 00:11:06,000 Oh, so close! 176 00:11:06,000 --> 00:11:12,000 Carrie's horse has a much better sense of direction, but still no sense of occasion. 177 00:11:12,000 --> 00:11:13,000 Go faster. 178 00:11:18,000 --> 00:11:21,000 Now if we could just do that a little faster. 179 00:11:23,000 --> 00:11:27,000 At least she hit the target. Let's see if Tori can do it a little faster. 180 00:11:30,000 --> 00:11:32,000 Yeah, got him! 181 00:11:32,000 --> 00:11:37,000 Not bad at all, but we're testing a myth based on the best mounted archers in history. 182 00:11:37,000 --> 00:11:41,000 There's no point in our guys taking a static comparison shot. 183 00:11:41,000 --> 00:11:44,000 It's time to saddle up the professionals. 184 00:11:45,000 --> 00:11:49,000 Now the three pieces of data that we need are the speed of the horse, 185 00:11:51,000 --> 00:11:54,000 the terminal velocity of the arrow, 186 00:11:55,000 --> 00:12:01,000 and then finally the thing about which this myth is truly about is the penetration of the arrow. 187 00:12:03,000 --> 00:12:11,000 So the team demotes itself to setting up the gizmos that should accurately measure the speed of the arrow and the penetration. 188 00:12:11,000 --> 00:12:14,000 We're also going to be measuring the speed of the horses. 189 00:12:14,000 --> 00:12:19,000 So I've got this radar gun, and we'll point it at the horses, and it'll give us their speed in miles per hour. 190 00:12:20,000 --> 00:12:25,000 First up, Lucas, Katie and Holm take a bunch of shots from a standing start. 191 00:12:25,000 --> 00:12:31,000 This is the key control data they'll need to compare with arrows fired at the gallop. 192 00:12:31,000 --> 00:12:37,000 Average arrow speed is right on the money for the myth, between 130 and 140 miles per hour. 193 00:12:38,000 --> 00:12:41,000 Six and an eighth inches deep into the foam. 194 00:12:41,000 --> 00:12:43,000 Eight inches and three-eighths. 195 00:12:44,000 --> 00:12:46,000 Ten and three-quarter inches. 196 00:12:46,000 --> 00:12:48,000 And now for some real riding. 197 00:12:48,000 --> 00:12:52,000 Top speed for light cavalry is recommended close to 40 miles per hour. 198 00:12:52,000 --> 00:12:58,000 So to properly test the myth, they all need to hit 40 and hit the target. 199 00:12:58,000 --> 00:12:59,000 Wow, nice shot! 200 00:12:59,000 --> 00:13:02,000 You know she smiles the entire time. 201 00:13:02,000 --> 00:13:04,000 Like, oh yeah, whatever. 202 00:13:04,000 --> 00:13:08,000 She's galloping at 44 miles an hour and hitting the target. I'd be smiling too. 203 00:13:12,000 --> 00:13:14,000 Every arrow that hits home... 204 00:13:15,000 --> 00:13:16,000 Dang, she hit her. 205 00:13:16,000 --> 00:13:17,000 Ha, good! 206 00:13:18,000 --> 00:13:20,000 ...gets wrenched out and measured. 207 00:13:20,000 --> 00:13:23,000 Eleven and a half inches, twelve and a half inches. 208 00:13:23,000 --> 00:13:31,000 On average, the penetration is deeper, but not by much, suggesting that this medieval myth might be horse manure. 209 00:13:31,000 --> 00:13:34,000 But the data just isn't consistent enough to make a call. 210 00:13:35,000 --> 00:13:38,000 Three different archers, three different horses. 211 00:13:38,000 --> 00:13:42,000 Arrows fired at different speeds from a variable distance. 212 00:13:42,000 --> 00:13:44,000 The data is diabolical. 213 00:13:44,000 --> 00:13:45,000 Our riders did really great. 214 00:13:45,000 --> 00:13:48,000 I mean, they were accurate and they had a great speed. 215 00:13:48,000 --> 00:13:54,000 Unfortunately, all of these numbers are just not consistent enough to give us a really good conclusion. 216 00:13:55,000 --> 00:14:00,000 Nothing here really supports the myth, but I'm afraid that our margin of error is way too big. 217 00:14:00,000 --> 00:14:05,000 I mean, we've got moving horses and we're of course human errors involved here. 218 00:14:05,000 --> 00:14:08,000 So I think we really need to take this back to the shop, see what variables we can cut out, 219 00:14:08,000 --> 00:14:15,000 and see if we can just find the core of this myth, which is, will the momentum of movement add penetration to the shot? 220 00:14:16,000 --> 00:14:17,000 After the break. 221 00:14:17,000 --> 00:14:22,000 Adam and Jamie turn up the heat on the urban myth of exploding bumpers. 222 00:14:22,000 --> 00:14:23,000 I hope this one works. 223 00:14:23,000 --> 00:14:24,000 Me too. 224 00:14:26,000 --> 00:14:32,000 And later, Tori Grant and Kerry add modern mechanics to medieval mayhem. 225 00:14:32,000 --> 00:14:33,000 Does this work? 226 00:14:33,000 --> 00:14:47,000 Testing the myth of exploding bumpers, Adam and Jamie torched a car to see just how hot it burns. 227 00:14:47,000 --> 00:14:50,000 Around 1400 degrees Celsius. 228 00:14:53,000 --> 00:14:56,000 The car fared much worse than Adam. 229 00:14:56,000 --> 00:14:57,000 I'm totally alright. 230 00:14:57,000 --> 00:14:58,000 It just scared me. 231 00:14:58,000 --> 00:15:01,000 But the bumpers failed to blast off. 232 00:15:01,000 --> 00:15:03,000 Now our pistons are still there. 233 00:15:03,000 --> 00:15:06,000 But the bumper is melted. 234 00:15:07,000 --> 00:15:10,000 Time for a pit stop to pick up the parts they'll need. 235 00:15:10,000 --> 00:15:11,000 Yeah, this one's there. 236 00:15:11,000 --> 00:15:16,000 Specifically, the kind of bumper shocks that supposedly launched the legend. 237 00:15:16,000 --> 00:15:18,000 Like little rockets right there, huh? 238 00:15:18,000 --> 00:15:21,000 You've got an internal sleeve and an external sleeve. 239 00:15:21,000 --> 00:15:24,000 And when you hit something at a slow speed, the internal sleeve moves slightly. 240 00:15:24,000 --> 00:15:28,000 It's pushing against some kind of gas and that hopefully reduces damage to the car. 241 00:15:28,000 --> 00:15:35,000 But when you heat that gas that it's pushing against, it expands causing this thing to fail catastrophically 242 00:15:35,000 --> 00:15:37,000 and maybe hurt some safety personnel in the vicinity. 243 00:15:37,000 --> 00:15:38,000 At least that's the theory. 244 00:15:38,000 --> 00:15:40,000 That's what we've got to test out. 245 00:15:40,000 --> 00:15:46,000 They'll start the testing without the actual bumper because these are the alleged culprits. 246 00:15:47,000 --> 00:15:49,000 Adam sets up the blast screen. 247 00:15:50,000 --> 00:15:54,000 As Jamie spot welds a steel tube to a heavy stand. 248 00:15:54,000 --> 00:15:59,000 At a certain point, we suspect we're going to reach a critical kind of heat level 249 00:15:59,000 --> 00:16:03,000 where the gas pressure exceeds what this chamber will hold 250 00:16:03,000 --> 00:16:06,000 and this shoots out this way at high velocity. 251 00:16:07,000 --> 00:16:11,000 Adam attaches a thermocouple to monitor the surface temperature. 252 00:16:11,000 --> 00:16:13,000 And now for the heat source. 253 00:16:13,000 --> 00:16:17,000 Jamie lights an oxyacetyl in torch and they're good to go. 254 00:16:17,000 --> 00:16:18,000 Moving it in. 255 00:16:18,000 --> 00:16:19,000 All right. 256 00:16:20,000 --> 00:16:21,000 That looks good. 257 00:16:21,000 --> 00:16:23,000 Trying not to bump that. 258 00:16:23,000 --> 00:16:25,000 Temperature's rising fast. 259 00:16:25,000 --> 00:16:28,000 10 seconds in or 50 degrees Celsius. 260 00:16:28,000 --> 00:16:31,000 They don't expect this to get quite as hot as the car fire. 261 00:16:31,000 --> 00:16:35,000 After all, that was 1400 degrees Celsius. 262 00:16:35,000 --> 00:16:41,000 The aim here is to see if directional heat works where an unfocused inferno failed. 263 00:16:41,000 --> 00:16:43,000 Any predictions as to when it's going to blow? 264 00:16:44,000 --> 00:16:46,000 I'm guessing 620 degrees. 265 00:16:47,000 --> 00:16:48,000 I don't know. 266 00:16:48,000 --> 00:16:51,000 All I do know is that right there is a pipe bomb. 267 00:16:51,000 --> 00:16:57,000 It's at about 500 Fahrenheit. 295 Celsius. 268 00:16:57,000 --> 00:17:00,000 You know, this is actually really scary. 269 00:17:00,000 --> 00:17:01,000 I agree. 270 00:17:01,000 --> 00:17:03,000 Ho, ho, ho. 271 00:17:03,000 --> 00:17:05,000 Looks like we got some kind of failure. 272 00:17:05,000 --> 00:17:09,000 Nine minutes in with the temperature just past 400 degrees, 273 00:17:09,000 --> 00:17:12,000 toxic smoke starts to billow from the piston. 274 00:17:12,000 --> 00:17:14,000 No one knows for sure what it is, 275 00:17:14,000 --> 00:17:18,000 but the noxious smell is enough to put the fear into everyone. 276 00:17:18,000 --> 00:17:19,000 You going to turn it off? 277 00:17:19,000 --> 00:17:20,000 Yeah. 278 00:17:20,000 --> 00:17:21,000 It's just making a lot of smoke. 279 00:17:21,000 --> 00:17:23,000 I think we've lost pressure. 280 00:17:23,000 --> 00:17:24,000 All right. 281 00:17:24,000 --> 00:17:26,000 Let's all clear out of here and evacuate this place. 282 00:17:26,000 --> 00:17:27,000 Who knows what that is? 283 00:17:27,000 --> 00:17:28,000 Yeah. 284 00:17:28,000 --> 00:17:30,000 When the smoke clears and the piston cools, 285 00:17:30,000 --> 00:17:34,000 they decide to do what maybe they should have done first off. 286 00:17:34,000 --> 00:17:37,000 Cut the darn thing in half to see how it works. 287 00:17:37,000 --> 00:17:42,000 Oh, interesting. 288 00:17:42,000 --> 00:17:44,000 There's an O-ring in there, actually. 289 00:17:44,000 --> 00:17:46,000 Yeah, it's a melted plastic. 290 00:17:46,000 --> 00:17:50,000 They know that somewhere inside the inner tube is a fluid chamber, 291 00:17:50,000 --> 00:17:54,000 and somewhere else there's a compressed gas chamber. 292 00:17:54,000 --> 00:17:56,000 And that's what they're looking for. 293 00:17:56,000 --> 00:17:58,000 I'm going to get this at all. 294 00:17:58,000 --> 00:18:00,000 Just as confusion hits critical mass. 295 00:18:00,000 --> 00:18:02,000 So it looks like that is the gas chamber. 296 00:18:02,000 --> 00:18:06,000 So one way or another, that's where the heat has to go. 297 00:18:06,000 --> 00:18:08,000 We were heating it up at the other end. 298 00:18:08,000 --> 00:18:09,000 Yeah. 299 00:18:09,000 --> 00:18:11,000 So we got to put the flame right on the end of this. 300 00:18:11,000 --> 00:18:13,000 And hopefully it won't melt the seals. 301 00:18:13,000 --> 00:18:14,000 Hopefully. 302 00:18:14,000 --> 00:18:17,000 Test two proceeds with a more focused flame, 303 00:18:17,000 --> 00:18:20,000 hopefully raising the heat so fast that the gas explodes 304 00:18:20,000 --> 00:18:22,000 before the sealing ring melts, 305 00:18:22,000 --> 00:18:26,000 and lets it dissipate, disappointingly, safely. 306 00:18:26,000 --> 00:18:29,000 We're getting that back end as hot as possible, as fast as possible. 307 00:18:29,000 --> 00:18:34,000 But these smoke signals are not sending a hopeful message. 308 00:18:34,000 --> 00:18:37,000 Does that mean I'm burning a hole? 309 00:18:37,000 --> 00:18:40,000 Ha ha ha ha ha! 310 00:18:40,000 --> 00:18:42,000 That means you burned a hole. 311 00:18:42,000 --> 00:18:45,000 52 seconds. 312 00:18:45,000 --> 00:18:48,000 I'll bet that hole is part of the design process. 313 00:18:48,000 --> 00:18:52,000 I'll bet that's made to fail, just in that exact way. 314 00:18:52,000 --> 00:18:54,000 This thing's made to not blow. 315 00:18:54,000 --> 00:18:56,000 How are we going to get it to blow? 316 00:18:56,000 --> 00:18:59,000 Don't you hate it when something you've paid good money for 317 00:18:59,000 --> 00:19:02,000 won't break the way you want it to? 318 00:19:02,000 --> 00:19:05,000 As for blowing this thing the mythical 50 feet, 319 00:19:05,000 --> 00:19:08,000 50 miles looks just as likely. 320 00:19:08,000 --> 00:19:10,000 This is failing, but it's failing safely. 321 00:19:10,000 --> 00:19:12,000 We don't want a safe failure. 322 00:19:12,000 --> 00:19:13,000 We want a kaboom. 323 00:19:13,000 --> 00:19:16,000 We want this thing to become a projectile. 324 00:19:16,000 --> 00:19:19,000 So, next thing we're thinking of is putting heat right here at the neck, 325 00:19:19,000 --> 00:19:22,000 away from this safety release, away from this O-ring, 326 00:19:22,000 --> 00:19:24,000 away from this plastic, hopefully, 327 00:19:24,000 --> 00:19:27,000 to get enough pressure in this gas chamber 328 00:19:27,000 --> 00:19:31,000 to cause the catastrophic failure we're looking for. 329 00:19:31,000 --> 00:19:32,000 Is it metal? 330 00:19:32,000 --> 00:19:33,000 That looks good. 331 00:19:33,000 --> 00:19:34,000 Okay. 332 00:19:34,000 --> 00:19:35,000 Okay. 333 00:19:35,000 --> 00:19:38,000 Now it's getting a red hot there. 334 00:19:38,000 --> 00:19:41,000 Yeah, that's really fast. 335 00:19:41,000 --> 00:19:47,000 And a rapid heat spike might just do the trick. 336 00:19:47,000 --> 00:19:49,000 Then again, it might not. 337 00:19:49,000 --> 00:19:51,000 Too much heat, too quickly. 338 00:19:51,000 --> 00:19:52,000 Too much heat, too quickly. 339 00:19:52,000 --> 00:19:55,000 This failure to launch becomes all the more frustrating 340 00:19:55,000 --> 00:19:58,000 when Adam and Jamie get new intelligence from the researchers. 341 00:19:58,000 --> 00:20:03,000 They found a real live person who's experienced a genuine 342 00:20:03,000 --> 00:20:05,000 exploding bumper event. 343 00:20:05,000 --> 00:20:09,000 Oakland firefighter Jennifer Schmidt wasn't just a witness, 344 00:20:09,000 --> 00:20:11,000 she was a casualty. 345 00:20:11,000 --> 00:20:12,000 Can you tell us what happened? 346 00:20:12,000 --> 00:20:13,000 Sure. 347 00:20:13,000 --> 00:20:17,000 We got called one night for a vehicle fire 348 00:20:17,000 --> 00:20:19,000 in someone's driveway up next to a house. 349 00:20:19,000 --> 00:20:22,000 When we got there, the car was on fire. 350 00:20:22,000 --> 00:20:25,000 So, I pulled the hose line around to the side of the car, 351 00:20:25,000 --> 00:20:27,000 the right side, and started to put the fire on. 352 00:20:27,000 --> 00:20:30,000 And started to put the nozzle up under the wheel well 353 00:20:30,000 --> 00:20:32,000 to put the flames out. 354 00:20:32,000 --> 00:20:34,000 And that's when we heard the first of two explosions 355 00:20:34,000 --> 00:20:35,000 at that point. 356 00:20:35,000 --> 00:20:38,000 I thought initially that it was the right front tire 357 00:20:38,000 --> 00:20:41,000 that exploded because I've heard and seen that several times 358 00:20:41,000 --> 00:20:42,000 during car fires. 359 00:20:42,000 --> 00:20:45,000 And I moved in front of the car and just as I opened the nozzle, 360 00:20:45,000 --> 00:20:47,000 we heard another explosion. 361 00:20:47,000 --> 00:20:49,000 And that's when something hit my legs. 362 00:20:49,000 --> 00:20:53,000 And I was knocked to the ground and started yelling for help. 363 00:20:53,000 --> 00:20:54,000 I had no idea what happened. 364 00:20:54,000 --> 00:20:56,000 So, it turned out to be the bumper that hit you? 365 00:20:56,000 --> 00:20:57,000 Yes. 366 00:20:57,000 --> 00:20:59,000 And they brought the bumpers actually to the hospital 367 00:20:59,000 --> 00:21:00,000 to show me. 368 00:21:00,000 --> 00:21:03,000 So, it was kind of scary to see that. 369 00:21:03,000 --> 00:21:05,000 What were the extent of your injuries? 370 00:21:05,000 --> 00:21:09,000 Well, the bumper hit both legs, but it only broke my left lower leg. 371 00:21:09,000 --> 00:21:12,000 And it broke both bones, the tibia and the fibula. 372 00:21:12,000 --> 00:21:16,000 The tibia was broken in about 20 pieces. 373 00:21:16,000 --> 00:21:19,000 So, pretty significant. 374 00:21:19,000 --> 00:21:23,000 But our myth from the fan site is a bit more extreme. 375 00:21:23,000 --> 00:21:26,000 There's no doubt that Jennifer was badly injured. 376 00:21:26,000 --> 00:21:31,000 But bits of this bumper flew 15 feet, not 50. 377 00:21:31,000 --> 00:21:34,000 Still, this first-hand account of Jen's trauma 378 00:21:34,000 --> 00:21:37,000 inspires Adam to rethink his methods. 379 00:21:37,000 --> 00:21:39,000 But the difference between our setup and the real world 380 00:21:39,000 --> 00:21:42,000 is that that chuck is usually mounted to a bumper. 381 00:21:42,000 --> 00:21:44,000 And the bumper in question is a massive piece of aluminum 382 00:21:44,000 --> 00:21:47,000 about a quarter-inch thick that is acting as a heat sink, 383 00:21:47,000 --> 00:21:51,000 i.e., it is pulling heat away from the end of that bumper 384 00:21:51,000 --> 00:21:55,000 exactly where we're finding one of the most effective safety valves. 385 00:21:55,000 --> 00:21:58,000 So, we're going to bolt back a piece of bumper onto that shock, 386 00:21:58,000 --> 00:22:01,000 heat it in the same place and see if we get a different result. 387 00:22:04,000 --> 00:22:06,000 There you go, one big heat sink coming up. 388 00:22:06,000 --> 00:22:09,000 And a finishing touch from Jamie. 389 00:22:09,000 --> 00:22:11,000 This is perforated metal. 390 00:22:11,000 --> 00:22:14,000 I'm going to wire a couple of these pieces on there. 391 00:22:14,000 --> 00:22:17,000 And so, hopefully, this will spread the heat out 392 00:22:17,000 --> 00:22:20,000 to where we don't end up with a red-hot molten area 393 00:22:20,000 --> 00:22:22,000 that will burst the chamber before it, like, 394 00:22:22,000 --> 00:22:24,000 explodes the way we want it to. 395 00:22:24,000 --> 00:22:26,000 I hope this one works. 396 00:22:26,000 --> 00:22:28,000 Me too. 397 00:22:28,000 --> 00:22:31,000 These one-in-a-million myths kick our ass every time. 398 00:22:31,000 --> 00:22:36,000 And these two must have targets tattooed on their own rear bumpers. 399 00:22:36,000 --> 00:22:38,000 After five minutes... 400 00:22:38,000 --> 00:22:41,000 Oh, where did that come from? 401 00:22:41,000 --> 00:22:44,000 Looks like it blew a hole in that front part. 402 00:22:44,000 --> 00:22:46,000 Where it did before? 403 00:22:46,000 --> 00:22:47,000 Yeah. 404 00:22:47,000 --> 00:22:48,000 Damn it! 405 00:22:48,000 --> 00:22:50,000 I don't think we can do anything more with this. 406 00:22:50,000 --> 00:22:53,000 It could take a lifetime of testing to replicate 407 00:22:53,000 --> 00:22:56,000 what must be a one-in-a-million occurrence. 408 00:22:56,000 --> 00:23:00,000 And the boys might have better things to do with their twilight years. 409 00:23:00,000 --> 00:23:02,000 I think we have to abandon it. 410 00:23:02,000 --> 00:23:06,000 But if you think they're giving up before we see a bumper gobalistic, 411 00:23:06,000 --> 00:23:09,000 just remember, you're watching Mythlusters. 412 00:23:09,000 --> 00:23:10,000 What? 413 00:23:10,000 --> 00:23:11,000 Coming up... 414 00:23:11,000 --> 00:23:12,000 Howl! 415 00:23:12,000 --> 00:23:13,000 Howl! 416 00:23:13,000 --> 00:23:16,000 The high-tech solution to a low-tech myth. 417 00:23:16,000 --> 00:23:18,000 Why is everybody scaring Adam? 418 00:23:18,000 --> 00:23:23,000 And later, Jamie and Adam find a spectacular way to launch that bumper. 419 00:23:23,000 --> 00:23:24,000 Perfect. 420 00:23:28,000 --> 00:23:33,000 Remember, do not try anything you are about to see at home. 421 00:23:33,000 --> 00:23:36,000 Despite the best efforts of our amateurs... 422 00:23:36,000 --> 00:23:38,000 Yeah, no! 423 00:23:38,000 --> 00:23:40,000 And the pros... 424 00:23:40,000 --> 00:23:46,000 inconsistent data means that our medieval archery myth remains unresolved. 425 00:23:46,000 --> 00:23:50,000 The legend we're testing is that expert Eastern European archers 426 00:23:50,000 --> 00:23:54,000 got twice the penetration shooting from the middle of the world. 427 00:23:54,000 --> 00:23:57,000 And the most important thing is that the best of our amateurs 428 00:23:57,000 --> 00:24:01,000 The legend we're testing is that expert Eastern European archers 429 00:24:01,000 --> 00:24:04,000 got twice the penetration shooting from horseback. 430 00:24:04,000 --> 00:24:09,000 To bust or confirm it, man and beast need to take a back seat. 431 00:24:09,000 --> 00:24:12,000 Mounted archers were amazing, 432 00:24:12,000 --> 00:24:14,000 but the results just not consistent enough to call it. 433 00:24:14,000 --> 00:24:16,000 Yeah, to make this an accurate experiment, 434 00:24:16,000 --> 00:24:18,000 we need to have the speed of the horse, 435 00:24:18,000 --> 00:24:21,000 the speed of the arrow and the accuracy all be repeatable. 436 00:24:21,000 --> 00:24:24,000 And with humans and horses in the equation, that's just not going to happen. 437 00:24:24,000 --> 00:24:26,000 Alright, well why don't we get rid of both? 438 00:24:26,000 --> 00:24:29,000 We'll replace the bow with a crossbow that's calibrated to a medieval bow, 439 00:24:29,000 --> 00:24:31,000 and then we'll replace the horse with a vehicle, 440 00:24:31,000 --> 00:24:34,000 so that way we make sure it's going at the same speed every time. 441 00:24:34,000 --> 00:24:36,000 And to make sure that we're firing from the same place every time, 442 00:24:36,000 --> 00:24:38,000 we can mount the crossbow. 443 00:24:38,000 --> 00:24:41,000 This is going to be great. I know the perfect vehicle. 444 00:24:41,000 --> 00:24:43,000 I'll go get it. 445 00:24:43,000 --> 00:24:45,000 Okay, he better not be going for my car. 446 00:24:45,000 --> 00:24:47,000 Then you'll have a crossbow attached to your car. 447 00:24:50,000 --> 00:24:52,000 Carrie's wheels are safe for now. 448 00:24:52,000 --> 00:24:55,000 Grant's already sourced a replacement horse 449 00:24:55,000 --> 00:24:58,000 that will do 40 miles per hour every time. 450 00:24:58,000 --> 00:25:00,000 Guaranteed. 451 00:25:00,000 --> 00:25:02,000 Oh my God, it's perfect! 452 00:25:02,000 --> 00:25:05,000 The Jeep comes fitted with what looks like a 50 cal machine gun. 453 00:25:05,000 --> 00:25:07,000 Does this work? 454 00:25:07,000 --> 00:25:09,000 No, now it's a replica. 455 00:25:09,000 --> 00:25:12,000 Tori plans to replace that with a compound crossbow. 456 00:25:12,000 --> 00:25:15,000 Naturally, he'll have to test it first. 457 00:25:15,000 --> 00:25:17,000 So now for one of those definitive, 458 00:25:17,000 --> 00:25:20,000 don't try this at home moments. 459 00:25:25,000 --> 00:25:27,000 It looks like it's accurate. 460 00:25:27,000 --> 00:25:29,000 Now whether or not it's consistent, 461 00:25:29,000 --> 00:25:31,000 I'll find out. 462 00:25:31,000 --> 00:25:35,000 While Tori sets the platform for a more credible set of crossbow tests, 463 00:25:35,000 --> 00:25:39,000 Carrie carves out a hood ornament 464 00:25:39,000 --> 00:25:42,000 that honors the origins of the myth. 465 00:25:42,000 --> 00:25:44,000 We have to take the horse out of the equation, 466 00:25:44,000 --> 00:25:46,000 but I don't want to take it out entirely 467 00:25:46,000 --> 00:25:48,000 because really it's the essence of the myth. 468 00:25:48,000 --> 00:25:50,000 So I'm going to try to get it out of the way. 469 00:25:50,000 --> 00:25:52,000 I'm going to try to get it out of the way. 470 00:25:52,000 --> 00:25:54,000 I don't want to take it out entirely 471 00:25:54,000 --> 00:25:56,000 because really it's the essence of the myth. 472 00:25:56,000 --> 00:25:58,000 So I'm going to dress up our car so it looks a little more like a horse. 473 00:25:58,000 --> 00:26:00,000 Meantime, Tori's found a target 474 00:26:00,000 --> 00:26:03,000 to test the consistency of the penetration. 475 00:26:03,000 --> 00:26:06,000 That would be the back of Grant's head. 476 00:26:11,000 --> 00:26:14,000 As you'd expect, the damage done to the jelly brain 477 00:26:14,000 --> 00:26:17,000 is almost the same from each shot. 478 00:26:17,000 --> 00:26:19,000 2 1⁄8 inches. 479 00:26:19,000 --> 00:26:21,000 And Tori's fine-tuned the bow speed 480 00:26:21,000 --> 00:26:24,000 back to a more leisurely medieval pace. 481 00:26:24,000 --> 00:26:26,000 We're taking out a few variables here 482 00:26:26,000 --> 00:26:29,000 so we can just get down to that one little question. 483 00:26:29,000 --> 00:26:32,000 Our horse is now a car horse. 484 00:26:32,000 --> 00:26:34,000 That way we don't have all of the jostling 485 00:26:34,000 --> 00:26:36,000 and we have a constant speed 486 00:26:36,000 --> 00:26:38,000 because the horses, they just weren't getting it 487 00:26:38,000 --> 00:26:40,000 when I was explaining to them to go one speed. 488 00:26:40,000 --> 00:26:42,000 With a horse head to the fore 489 00:26:42,000 --> 00:26:44,000 and a horse tail aft, 490 00:26:44,000 --> 00:26:48,000 this custom jeep is undeniably one of a kind. 491 00:26:48,000 --> 00:26:50,000 Especially when the whole thing is sprayed in, 492 00:26:50,000 --> 00:26:52,000 we mean business black. 493 00:26:52,000 --> 00:26:54,000 Black shooting. That's their name. 494 00:26:54,000 --> 00:26:57,000 Black shooting. Get it? 495 00:26:57,000 --> 00:27:02,000 But Grant's head is way too small to be a viable target. 496 00:27:02,000 --> 00:27:04,000 So the man himself offers up an alternative 497 00:27:04,000 --> 00:27:09,000 with a similar density to the flesh of a barbarian enemy. 498 00:27:09,000 --> 00:27:11,000 Now this foam is going to make a great target 499 00:27:11,000 --> 00:27:14,000 for comparing the penetrating power of our arrows. 500 00:27:14,000 --> 00:27:16,000 But I think it's missing a little something. 501 00:27:16,000 --> 00:27:19,000 I think it's missing that hint of realism. 502 00:27:19,000 --> 00:27:22,000 Time to breast down for the occasion. 503 00:27:22,000 --> 00:27:23,000 What exactly are we? 504 00:27:23,000 --> 00:27:25,000 We're ancient warriors. 505 00:27:25,000 --> 00:27:27,000 It's not really very accurate, but... 506 00:27:27,000 --> 00:27:30,000 Yeah, we're the invading horde. 507 00:27:30,000 --> 00:27:32,000 Okay? 508 00:27:32,000 --> 00:27:34,000 This isn't the history channel. 509 00:27:34,000 --> 00:27:36,000 Grant sets the timer on the camera 510 00:27:36,000 --> 00:27:41,000 and the crew do their best to say cheese in barbarian. 511 00:27:41,000 --> 00:27:43,000 We're left with a happy snap 512 00:27:43,000 --> 00:27:47,000 well and truly fit for a big foam dartboard. 513 00:27:47,000 --> 00:27:50,000 Good. I thought that was good. 514 00:27:50,000 --> 00:27:53,000 I felt angry. That's good. 515 00:27:53,000 --> 00:27:59,000 Next up, Torey's man parts succumb to hostile fire. 516 00:27:59,000 --> 00:28:02,000 Right in the ding dong. 517 00:28:02,000 --> 00:28:04,000 While Jamie and Adam find a brand new way 518 00:28:04,000 --> 00:28:07,000 to obliterate a crash test dummy. 519 00:28:07,000 --> 00:28:09,000 Two, one. 520 00:28:14,000 --> 00:28:19,000 It's one thing to ride a horse at speed without falling off. 521 00:28:19,000 --> 00:28:23,000 It's at least twice as hard to drop the reins and shoot an arrow. 522 00:28:23,000 --> 00:28:27,000 But will that arrow get twice the penetration? 523 00:28:27,000 --> 00:28:29,000 I think we're ready to attack. 524 00:28:29,000 --> 00:28:33,000 Carrie, Torey and Grant began testing their medieval archery myth 525 00:28:33,000 --> 00:28:36,000 with real horses and a handheld bow. 526 00:28:36,000 --> 00:28:39,000 Oh, so close. 527 00:28:39,000 --> 00:28:41,000 For the sake of consistency, 528 00:28:41,000 --> 00:28:44,000 they've changed up to a jeep and a crossbow. 529 00:28:44,000 --> 00:28:47,000 But the principle is just the same. 530 00:28:47,000 --> 00:28:50,000 Could a modest 40 miles per hour running start 531 00:28:50,000 --> 00:28:53,000 double the depth of the arrow? 532 00:28:53,000 --> 00:28:56,000 Ha ha ha. 533 00:28:56,000 --> 00:28:59,000 Got our own billboard. 534 00:29:01,000 --> 00:29:04,000 Zena, Conan, Papa Smurf. 535 00:29:04,000 --> 00:29:07,000 Hopefully they've nailed the consistency. 536 00:29:07,000 --> 00:29:10,000 But let's remember that this myth rests in G. 537 00:29:10,000 --> 00:29:13,000 The horse myth rests entirely on added momentum. 538 00:29:13,000 --> 00:29:19,000 Torey needs to shoot at speed precisely 60 feet short of the target. 539 00:29:19,000 --> 00:29:22,000 60 feet, right here. 540 00:29:22,000 --> 00:29:26,000 It's a legend that's been hotly debated for 500 years. 541 00:29:26,000 --> 00:29:29,000 So I guess we can hang on for a few more minutes 542 00:29:29,000 --> 00:29:33,000 to call it confirmed, plausible, or busted. 543 00:29:35,000 --> 00:29:37,000 You've seen a little bit of us learning to ride, 544 00:29:37,000 --> 00:29:39,000 but of course there's a whole lot more we couldn't fit in. 545 00:29:39,000 --> 00:29:42,000 And have another laugh at our expense. 546 00:29:42,000 --> 00:29:45,000 Log on to Discovery.com slash MythBusters. 547 00:29:50,000 --> 00:29:53,000 Back in the 1930s, there was nothing funnier 548 00:29:53,000 --> 00:29:57,000 than watching an automobile deconstruct after a minor collision. 549 00:30:00,000 --> 00:30:03,000 Okay, it's still funny. 550 00:30:03,000 --> 00:30:05,000 I told you not to make that last payment. 551 00:30:05,000 --> 00:30:10,000 But these days, we're less inclined to laugh at catastrophic car failure. 552 00:30:13,000 --> 00:30:15,000 Adam and Jamie have gone into meltdown 553 00:30:15,000 --> 00:30:19,000 trying to replicate the myth of the exploding bumper. 554 00:30:21,000 --> 00:30:26,000 Jennifer Schmidt said the bumper that broke her leg traveled just 15 feet. 555 00:30:26,000 --> 00:30:29,000 But the myth we're working with says 50. 556 00:30:29,000 --> 00:30:34,000 So far, Adam and Jamie haven't managed to shoot a bumper 5 inches. 557 00:30:34,000 --> 00:30:38,000 Damn it. Man, this one is kicking my butt. 558 00:30:38,000 --> 00:30:42,000 I mean, we are just not seeing any of the exploding bumper action 559 00:30:42,000 --> 00:30:44,000 we're trying to get out of these shocks. 560 00:30:44,000 --> 00:30:46,000 Well, yeah, but it kind of makes sense. 561 00:30:46,000 --> 00:30:50,000 I mean, these things are designed to not fail catastrophically. 562 00:30:50,000 --> 00:30:52,000 We still have to get that shot. 563 00:30:52,000 --> 00:30:55,000 We still have to see a bumper shooting 50 feet through the air. 564 00:30:55,000 --> 00:30:57,000 So how do we get that? 565 00:30:57,000 --> 00:30:59,000 When in doubt, C4. 566 00:30:59,000 --> 00:31:02,000 Well, maybe not C4, but you get the picture. 567 00:31:02,000 --> 00:31:03,000 I do. 568 00:31:04,000 --> 00:31:08,000 So now throwing caution and custom to the wind, 569 00:31:08,000 --> 00:31:12,000 they're engineering the spectacle we've all been begging for. 570 00:31:12,000 --> 00:31:15,000 Jamie cuts two massively upscaled pistons. 571 00:31:15,000 --> 00:31:20,000 And the plan here is to stuff them with sand, water and explosives. 572 00:31:22,000 --> 00:31:26,000 The best venue in these situations, as always, is the bomb range. 573 00:31:27,000 --> 00:31:29,000 I got surgeon. 574 00:31:29,000 --> 00:31:31,000 Nicely done. 575 00:31:31,000 --> 00:31:34,000 We've got one main thing to do before we run this experiment, 576 00:31:34,000 --> 00:31:37,000 which is attach the bumper to the car. 577 00:31:37,000 --> 00:31:40,000 And it's got a little more support than your average bumper. 578 00:31:40,000 --> 00:31:43,000 These explosive pistons are about 14 inches deep. 579 00:31:43,000 --> 00:31:46,000 And I need to hog out enough of the car's structure 580 00:31:46,000 --> 00:31:49,000 to get this puppy in there to attach the bumpers. 581 00:31:49,000 --> 00:31:52,000 Adam enthusiastically hogs out the front end, 582 00:31:52,000 --> 00:31:56,000 making room for Jamie's upscaled and built pistons. 583 00:31:57,000 --> 00:31:59,000 I think that's pretty much it. 584 00:31:59,000 --> 00:32:02,000 Now for the explosive bit. 585 00:32:02,000 --> 00:32:06,000 To make it happen, we've re-enlisted the man who set a similar charge 586 00:32:06,000 --> 00:32:09,000 for motorcycle flip, pyrotechnician Matt Herron. 587 00:32:09,000 --> 00:32:10,000 Boom. 588 00:32:10,000 --> 00:32:12,000 Boom. 589 00:32:12,000 --> 00:32:16,000 We're ramping it up, which is a little bit more than a hundred feet. 590 00:32:16,000 --> 00:32:17,000 Boom. 591 00:32:17,000 --> 00:32:20,000 We're ramping it up, which is kind of what we do on this show. 592 00:32:20,000 --> 00:32:25,000 So in this case, what we're doing here is putting the same amount of gunpowder 593 00:32:25,000 --> 00:32:28,000 that we used just a little while ago on motorcycle flip 594 00:32:28,000 --> 00:32:34,000 to shoot a motorcycle that weighed, you know, 250 pounds or so straight up in the air. 595 00:32:38,000 --> 00:32:40,000 Well, the timing was perfect. 596 00:32:40,000 --> 00:32:42,000 If you say so, Junior. 597 00:32:43,000 --> 00:32:49,000 In this case, all we've got to do is launch about 50 or 75 pounds straight that way. 598 00:32:49,000 --> 00:32:51,000 So it's going. 599 00:32:51,000 --> 00:32:52,000 So what do you think? 600 00:32:52,000 --> 00:32:54,000 Charging the end, sand the rest of the way? 601 00:32:54,000 --> 00:32:57,000 Sounds like a plan, yeah. 602 00:32:58,000 --> 00:33:02,000 Adam's plan is to place a mannequin exactly 50 feet in front of the car, 603 00:33:02,000 --> 00:33:04,000 just like the myth says. 604 00:33:06,000 --> 00:33:08,000 Cooperative love. 605 00:33:08,000 --> 00:33:12,000 For some reason, he's overcome by an urge to paint it red. 606 00:33:12,000 --> 00:33:14,000 Well, that increases its visibility. 607 00:33:14,000 --> 00:33:18,000 Meantime, Jamie's focused on the details of the detonations. 608 00:33:18,000 --> 00:33:24,000 Now, instead of compressed gas, we're going to put some gunpowder and a bunch of wet sand in here. 609 00:33:24,000 --> 00:33:25,000 Okay. 610 00:33:26,000 --> 00:33:27,000 Why the wet sand? 611 00:33:27,000 --> 00:33:31,000 Well, if we just packed this with gunpowder, we'd have a pipe bomb. 612 00:33:31,000 --> 00:33:36,000 So the wet sand actually acts as a shock absorber for the gunpowder 613 00:33:36,000 --> 00:33:40,000 and it translates that bang into forward movement. 614 00:33:41,000 --> 00:33:44,000 Matt connects both charges to the same circuit. 615 00:33:44,000 --> 00:33:46,000 This is my favorite part. 616 00:33:46,000 --> 00:33:49,000 So the two shocks should blow simultaneously. 617 00:33:50,000 --> 00:33:54,000 Jamie lards up the cylinders to minimize the friction. 618 00:33:54,000 --> 00:33:55,000 That ought to do it. 619 00:33:55,000 --> 00:33:57,000 And the bumper gets refitted. 620 00:33:59,000 --> 00:34:00,000 Nice and tight. 621 00:34:02,000 --> 00:34:03,000 Looks good right there. 622 00:34:03,000 --> 00:34:04,000 Perfect. 623 00:34:05,000 --> 00:34:06,000 What do you think? 624 00:34:06,000 --> 00:34:08,000 I think we're going to hit this guy. 625 00:34:08,000 --> 00:34:10,000 I think this thing's going to fly 50 feet. 626 00:34:10,000 --> 00:34:11,000 I have a good feeling. 627 00:34:11,000 --> 00:34:14,000 I think the bumper's going to stay still and the car's going to go up the hill. 628 00:34:14,000 --> 00:34:15,000 You don't really think that? 629 00:34:15,000 --> 00:34:16,000 No. 630 00:34:16,000 --> 00:34:17,000 Yeah, I think so. 631 00:34:17,000 --> 00:34:19,000 So Matt sets the twin fuses. 632 00:34:20,000 --> 00:34:21,000 We're fully armed. 633 00:34:21,000 --> 00:34:22,000 We're hot. 634 00:34:22,000 --> 00:34:26,000 And hopefully, we're about to get the finish we've come to expect. 635 00:34:26,000 --> 00:34:33,000 All right, simulated bumper blast in three, two, one. 636 00:34:37,000 --> 00:34:38,000 Damn. 637 00:34:38,000 --> 00:34:39,000 Wow. 638 00:34:43,000 --> 00:34:45,000 We may have almost done that. 639 00:34:46,000 --> 00:34:49,000 Overdone is a word we discourage here on Mythbusters. 640 00:34:49,000 --> 00:34:51,000 The trajectory was perfect. 641 00:34:51,000 --> 00:34:53,000 The mannequins a shattered wreck. 642 00:34:53,000 --> 00:34:55,000 And hey, we got what we came for. 643 00:34:56,000 --> 00:34:58,000 Well, definitely flew 50 feet. 644 00:34:59,000 --> 00:35:01,000 Oh, look, it's up there on the hill. 645 00:35:01,000 --> 00:35:02,000 Wow. 646 00:35:03,000 --> 00:35:05,000 Looks like we're going to have to get another dummy. 647 00:35:08,000 --> 00:35:10,000 We go through these mannequins like candy. 648 00:35:12,000 --> 00:35:19,000 They had to fudge the method, but now we have an insight into how unlikely a 50-foot blast must be. 649 00:35:20,000 --> 00:35:27,000 The bumper that smashed Jennifer's leg broke in three because the two shocks didn't explode in unison. 650 00:35:27,000 --> 00:35:33,000 We needed Matt's expertise and two plugs of gunpowder to make that happen. 651 00:35:33,000 --> 00:35:34,000 Still... 652 00:35:36,000 --> 00:35:40,000 These red stripes right here, those are your kneecaps. 653 00:35:40,000 --> 00:35:48,000 Now, granted, we might have exaggerated a little bit with this, but we know that this did happen with a very similar device with a car. 654 00:35:49,000 --> 00:35:53,000 So if you see a car fire, you shouldn't stand around it. 655 00:35:55,000 --> 00:35:56,000 You might get hurt. 656 00:35:57,000 --> 00:35:58,000 I'm pretty happy. 657 00:35:58,000 --> 00:36:01,000 We came here to make a bumper fly 50 feet and we totally exceeded that. 658 00:36:01,000 --> 00:36:02,000 It's a good test. 659 00:36:06,000 --> 00:36:12,000 Hey, it's a great test, but simultaneous catastrophic failure and a 50-foot launch? 660 00:36:12,000 --> 00:36:14,000 No way in the wide world. 661 00:36:14,000 --> 00:36:16,000 This one's busted. 662 00:36:19,000 --> 00:36:20,000 Still to come. 663 00:36:20,000 --> 00:36:22,000 Ah-hoo! Shoo-dee! Away! 664 00:36:22,000 --> 00:36:27,000 A Mad Max climax to the medieval myth of double-deep arrows. 665 00:36:31,000 --> 00:36:35,000 And now, another episode of Diesel Diaries. 666 00:36:35,000 --> 00:36:41,000 Okay, I love the 2009 Chet of TDI, but isn't Diesel really dirty and a huge contributor to greenhouse gases? 667 00:36:41,000 --> 00:36:43,000 I swear, Diesel gets such a bad rap. 668 00:36:43,000 --> 00:36:44,000 Here, let me borrow your scarf. 669 00:36:44,000 --> 00:36:45,000 What for? 670 00:36:45,000 --> 00:36:46,000 I'm going to show you something. 671 00:36:46,000 --> 00:36:47,000 Grant, start the car up. 672 00:36:49,000 --> 00:36:53,000 Now, if I cover the tailpipe like this, we'll get a visual of what's coming out. 673 00:36:53,000 --> 00:36:54,000 You're going to owe me a new scarf. 674 00:36:54,000 --> 00:36:56,000 But look, it's still white. 675 00:36:56,000 --> 00:36:57,000 You're still owe me a new scarf. 676 00:36:57,000 --> 00:36:59,000 All right, that's a cute little trick. 677 00:36:59,000 --> 00:37:04,000 But I took the Jetta in for a more scientific test, a CO2 test. 678 00:37:04,000 --> 00:37:10,000 CO2 is a leading contributor to greenhouse gases and the majority of it comes directly from vehicle emissions. 679 00:37:10,000 --> 00:37:13,000 Yeah, if a car doesn't have less than 15% CO2, there's something wrong with it. 680 00:37:13,000 --> 00:37:15,000 And the Jetta got 3.5%. 681 00:37:15,000 --> 00:37:16,000 That's amazing. 682 00:37:16,000 --> 00:37:19,000 That's over 70% less than an average car. 683 00:37:19,000 --> 00:37:20,000 Really? 684 00:37:20,000 --> 00:37:21,000 You don't say. 685 00:37:21,000 --> 00:37:22,000 All right, fine. 686 00:37:22,000 --> 00:37:23,000 You win. 687 00:37:23,000 --> 00:37:25,000 Diesel isn't a dirty word anymore. 688 00:37:30,000 --> 00:37:40,000 Grant, Harry and Tori are testing the myth that an arrow fired from a galloping horse has twice the penetration of an arrow fired from rest. 689 00:37:40,000 --> 00:37:43,000 They've had to make a few adjustments along the way. 690 00:37:43,000 --> 00:37:49,000 Even with trained horses, they might gallop at a different speed on each run. 691 00:37:49,000 --> 00:37:55,000 And even with expert archers, sometimes you might draw back the bow just a little bit further. 692 00:37:55,000 --> 00:37:58,000 So what we're doing right now is getting rid of all those variables. 693 00:37:58,000 --> 00:38:04,000 So the horse becomes a jeep and the medieval bow gets replaced by a modern crossbow. 694 00:38:04,000 --> 00:38:09,000 The changes are essential for reliable, repeatable testing. 695 00:38:09,000 --> 00:38:12,000 The first set of data points we're going to take are static shots. 696 00:38:12,000 --> 00:38:14,000 We're going to shoot a bunch of arrows into our target. 697 00:38:14,000 --> 00:38:16,000 I'm going to mark and measure each one. 698 00:38:16,000 --> 00:38:20,000 And that way we'll have a great comparison for when we actually do our moving shots. 699 00:38:20,000 --> 00:38:25,000 Tori's ready to rip through 10 arrows in quick succession from a standing start. 700 00:38:25,000 --> 00:38:28,000 In 3, 2, 1, fire. 701 00:38:28,000 --> 00:38:30,000 Fire. 702 00:38:33,000 --> 00:38:34,000 Nice. 703 00:38:34,000 --> 00:38:36,000 In 3, 2, 1. 704 00:38:37,000 --> 00:38:39,000 Ah-ha! 705 00:38:39,000 --> 00:38:45,000 He is consistent, but there's an unsettling pattern developing here. 706 00:38:45,000 --> 00:38:47,000 That was a little too close for comfort there. 707 00:38:47,000 --> 00:38:49,000 Still, nice grouping. 708 00:38:49,000 --> 00:38:52,000 3, 2, 1. 709 00:38:52,000 --> 00:38:54,000 Oh! 710 00:38:54,000 --> 00:38:57,000 Right in the ding-dong! 711 00:38:57,000 --> 00:39:00,000 Now it's up to Kari to mark the depth of each shaft. 712 00:39:02,000 --> 00:39:05,000 Oh, and it had to hurt right there in the genetic legacy. 713 00:39:05,000 --> 00:39:07,000 Ow! 714 00:39:07,000 --> 00:39:09,000 It's like I was aiming or something. 715 00:39:09,000 --> 00:39:11,000 Then put her back into it. 716 00:39:16,000 --> 00:39:21,000 10 test arrows should give us a good average static depth to work from. 717 00:39:21,000 --> 00:39:25,000 The average from our static shots is 8.77 inches of penetration. 718 00:39:25,000 --> 00:39:28,000 So now we're going to take our moving shots and compare the two. 719 00:39:28,000 --> 00:39:30,000 Here we go. 720 00:39:30,000 --> 00:39:32,000 Grant revs the Jeep like it's a rental. 721 00:39:35,000 --> 00:39:37,000 Then gets it up to speed. 722 00:39:37,000 --> 00:39:42,000 Tori steadies, aims, and makes one tiny mistake. 723 00:39:46,000 --> 00:39:47,000 I'm excited! 724 00:39:47,000 --> 00:39:50,000 I'm not so excited I forgot to take the save, y'all! 725 00:39:50,000 --> 00:39:52,000 Okay, good practice right, everyone. 726 00:39:52,000 --> 00:39:54,000 Alright, this one's for me. 727 00:39:54,000 --> 00:39:56,000 Good job, everyone. 728 00:39:56,000 --> 00:39:57,000 Alright! 729 00:39:57,000 --> 00:39:59,000 I owe Shudi a wave! 730 00:39:59,000 --> 00:40:01,000 Alright. 731 00:40:02,000 --> 00:40:08,000 Now let's see if Tori can keep his composure and hit the target. 732 00:40:11,000 --> 00:40:12,000 Go! 733 00:40:21,000 --> 00:40:24,000 The first three shots found a steady latitude. 734 00:40:24,000 --> 00:40:29,000 One hit the shield, one hit Tori, and the last hit Kari in her favorite kidney. 735 00:40:30,000 --> 00:40:34,000 I keep forgetting we're trying to get some actual data from all this. 736 00:40:34,000 --> 00:40:36,000 Yeah, oops! 737 00:40:36,000 --> 00:40:38,000 Dude, I thought we were just having fun. 738 00:40:38,000 --> 00:40:40,000 Yeah, don't forget to do the science. 739 00:40:41,000 --> 00:40:44,000 Yeah, let's not forget the science. 740 00:40:44,000 --> 00:40:50,000 These 10 running shots will bust or confirm the myth that our shot forwards at 40 miles per hour 741 00:40:50,000 --> 00:40:53,000 bury themselves twice as deep in the target. 742 00:40:53,000 --> 00:40:55,000 You're ready to go! 743 00:41:00,000 --> 00:41:04,000 Tori turns out to be a natural born archer. 744 00:41:04,000 --> 00:41:09,000 If shooting a crossbow from the back of a moving jeep was an Olympic sport, 745 00:41:10,000 --> 00:41:12,000 actually, why isn't it? 746 00:41:17,000 --> 00:41:20,000 Oh, I can do this all day! 747 00:41:20,000 --> 00:41:22,000 I gotta remember to stop! 748 00:41:22,000 --> 00:41:24,000 I didn't look like I was going! 749 00:41:24,000 --> 00:41:26,000 This just never gets old. 750 00:41:26,000 --> 00:41:28,000 But Tori's down to his last arrow. 751 00:41:28,000 --> 00:41:30,000 Ready when you are. 752 00:41:30,000 --> 00:41:35,000 And so far, Barbarian Dwarf Grant is unscathed. 753 00:41:46,000 --> 00:41:48,000 You got the dwarf! 754 00:41:48,000 --> 00:41:50,000 I got the dwarf! 755 00:41:50,000 --> 00:41:51,000 Yeah! 756 00:41:51,000 --> 00:41:53,000 You got the little bearded Grant! 757 00:41:53,000 --> 00:41:55,000 I'm dead! 758 00:41:55,000 --> 00:41:57,000 I thought you were going to get out of this battle unscathed. 759 00:41:57,000 --> 00:41:59,000 I don't think so, friend. 760 00:41:59,000 --> 00:42:01,000 Alright, now for the fun part! 761 00:42:01,000 --> 00:42:02,000 Yeah, Tata! 762 00:42:02,000 --> 00:42:04,000 I'm going to go do math. 763 00:42:04,000 --> 00:42:06,000 Don't be jealous. 764 00:42:06,000 --> 00:42:10,000 Once more, Kari marks the shafts exactly where they pierced the foam. 765 00:42:10,000 --> 00:42:13,000 And they're even harder to extract than last time. 766 00:42:18,000 --> 00:42:21,000 I feel like they're falling further. 767 00:42:22,000 --> 00:42:24,000 Now for the tail of the tape. 768 00:42:24,000 --> 00:42:27,000 As Kari measures the penetration of all ten arrows 769 00:42:27,000 --> 00:42:30,000 shot from a 40 mile per hour running start. 770 00:42:30,000 --> 00:42:32,000 The figures are actually pretty interesting. 771 00:42:32,000 --> 00:42:35,000 We are getting an average of 11 inches with all the moving shots. 772 00:42:35,000 --> 00:42:39,000 Which is a little over 2 inches more penetration than all the static shots. 773 00:42:39,000 --> 00:42:41,000 So we are getting more penetration. 774 00:42:41,000 --> 00:42:45,000 But it's not the double that the myth actually claims. 775 00:42:45,000 --> 00:42:46,000 Fire! 776 00:42:48,000 --> 00:42:53,000 If it was double, these arrows would have buried themselves all the way up to their feathers. 777 00:42:53,000 --> 00:42:55,000 Okay, Kari, so what do you got? 778 00:42:55,000 --> 00:42:58,000 Well for the static shots, I got an average of 8.77. 779 00:42:58,000 --> 00:43:02,000 Now for the moving shots, I got an average of 11.04 inches. 780 00:43:02,000 --> 00:43:05,000 Alright, well before we call this a bust, I think we need to go back to the shop, 781 00:43:05,000 --> 00:43:09,000 double check the high speed, and see what the speeds of the arrows were. 782 00:43:09,000 --> 00:43:11,000 Woo! 783 00:43:12,000 --> 00:43:17,000 The key to this myth is penetration, but after measuring our arrows, this one's busted. 784 00:43:17,000 --> 00:43:22,000 Yeah, and we use speed foam, which has a similar density to both our ballistic material and the human body. 785 00:43:22,000 --> 00:43:26,000 And we only got 25% more penetration, which is far from what their stories told. 786 00:43:26,000 --> 00:43:29,000 And that was backed up by our high speed footage, 787 00:43:29,000 --> 00:43:33,000 which showed that our iron and force increased the speed of our arrows by 31%, 788 00:43:33,000 --> 00:43:37,000 resulting in only a 72% increase in kinetic energy. 789 00:43:37,000 --> 00:43:38,000 Not quite double. 790 00:43:38,000 --> 00:43:42,000 Yeah, but you gotta give it to them. Riding horseback did give them some advantage. 791 00:43:42,000 --> 00:43:44,000 It just wasn't exactly as much as they bragged about. 792 00:43:44,000 --> 00:43:49,000 Yeah, but that being said, the arrows still didn't go twice as deep, so this one's busted. Busted. 793 00:43:49,000 --> 00:43:50,000 Busted.