| Author | Message | ||
| Dal Farnworth (Dallas)
Registered Member Username: Dallas Post Number: 630 Registered: 7-2004 Posted From: 98.20.56.166  Rating: |
Ever wonder how tough the GMC's are actually engineered? In this video, shot in high speed, it kind of looks like there was a problem with porpoising on the jump. The ramp didn't give the bus long enough to stabilize itself from the abrupt angle change. It also looks as if the RF air bag blew out, although I can't be sure... but the bus leans to that side as it comes off the ramp. {EDIT: in the bus jump angle 1 video you can see the right front come off the side of the ramp. so the airbag probably didn't blow.} The right windshield also comes out on impact and later, (in a different video) you can see the left windshield depart the coach. http://dsc.discovery.com/videos/mythbusters-bus-jump-high-speed.html http://dsc.discovery.com/videos/mythbusters-bus-jump-angle-1.html http://dsc.discovery.com/videos/mythbusters-bus-jump-angle-4.html | ||
| RJ Long (Rjlong)
Registered Member Username: Rjlong Post Number: 1828 Registered: 12-2000 Posted From: 71.195.124.20  Rating: N/A |
Dallas - When you watch all of the videos, the one glaring thing that stands out is how much the coach was weaving back and forth before it hit the ramp. My take? If they'd had a straight shot w/o weaving, plus lengthened the ramp another 20 - 30 feet, the coach may have landed rear axle first, like the movie. But what do I know. . . I'm not a stunt coordinator! FWIW & HTH. . .  | ||
| Dal Farnworth (Dallas)
Registered Member Username: Dallas Post Number: 631 Registered: 7-2004 Posted From: 98.20.56.166 Rating: N/A |
Yeah, I saw the weaving in one of the other videos. It didn't make a lot of sense to me... but maybe that's just a transit driver thing... looking for a curb to use as a brake. | ||
| Patrick levenson (Zubzub)
Registered Member Username: Zubzub Post Number: 293 Registered: 5-2007 Posted From: 174.91.218.163  Rating: N/A |
I can barely ever watch Mythbusters....there is way too much pseudo science and convenient supposition. Occasionally it seems to make sense...but usually they presume way too much about everything. Still the kids love it (drives me crazy, teaching them flawed methodology) | ||
| Buswarrior (Buswarrior)
Registered Member Username: Buswarrior Post Number: 2100 Registered: 12-2000 Posted From: 174.91.143.120  Rating: N/A |
The makers of Speed did a little piece on how they did the bus jump. Maybe on the internet someplace? the lip of the real jump provided some powered assistance, IIRC. And of course, a bunch of editing room work to superimpose the jumping coach onto the unfinished highway. This Mythbuster thing, looks pretty obvious that they lost control of the coach via their remote controls, rendering the test rather useless. happy coaching! buswarrior | ||
| L James Jones Jr (Jamo)
Registered Member Username: Jamo Post Number: 196 Registered: 11-2007 Posted From: 74.67.216.243  Rating: N/A |
Looks to me like they should have done more practice runs to gain better control. Whoever was at that joystick screwed up bigtime. And all the other stuff you guys said too... | ||
| Sam Summers (Greyghost)
Registered Member Username: Greyghost Post Number: 59 Registered: 4-2011 Posted From: 166.229.71.129  Rating: N/A |
On the movie they used a model to do the jump, I remember the piece they showed on how they did it. I agree on on the remote control driver following the bus, he was what caused it to go swerving all over. Sam | ||
| Tom Christman (Tchristman)
Registered Member Username: Tchristman Post Number: 307 Registered: 1-2006 Posted From: 66.218.33.156 Rating: N/A |
It also doesn't help that the right side of the bus was partially off the ramp. Dingbats! Good Luck, TomC | ||
| Teresa (Happycamperbrat)
Registered Member Username: Happycamperbrat Post Number: 291 Registered: 5-2009 Posted From: 173.25.102.41 Rating: N/A |
Rah Rah for the GMC!!! My kinda coach Very tough!!! I cant break one lol The thing that surprises me is not how well the coach held up, but the "ramps"! Those were the sea containers and they are only strong on the corners, the rest is just sheet metal..... how did they construct them to make them strong enough to support a bus off center like that? | ||
| Kyle Brandt (Kyle4501)
Registered Member Username: Kyle4501 Post Number: 626 Registered: 9-2004 Posted From: 71.12.88.184  Rating: N/A |
Patrick, I agree with your assesment of mythbusters - lots of "convenient" assumptions being made. Teresa, shipping containers have 14ga corrugated sides - they are lots stronger than you think. | ||
| Teresa (Happycamperbrat)
Registered Member Username: Happycamperbrat Post Number: 294 Registered: 5-2009 Posted From: 173.25.102.41 Rating: N/A |
I studied the containers, because I was thinking about burying one underground with dirt stacked on top. But from what I read about it, all the experts were saying dont do it because the metal roof and sides were not all that strong. It was only the framing that was super strong. True the force of the dirt and everything taken into consideration as well as the fact that the bus in the video was moving instead of just sitting in place AND the possibility that at least one of the tires never even made it on the ramp at any time (the passenger side front didnt look like it to me)and that they had some sort of wood ramp over the top of the containers to try to distribute the load..... all things taken into consideration it obviously was possible, just surprising to me. |
