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Daredevil Robbie Maddison completes Vegas jump

  1. Jan 1, 2009 #1

    LowlyPion

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    Here's a little physics in action to bring in the new year.
    http://www.smh.com.au/news/world/robbie-maddison-completes-vegas-jump/2009/01/01/1230681649061.html

    His runway speed was 54 mph. About 24 m/s. Figuring that V² = 2gh that translates to about 97.5 feet of potential energy. The Vegas Arc de T is 96 feet high. Physics pays dividends.

    The descent from the roof however was a bit more harrowing. He apparently hit the ramp a little far down and experienced slightly more deceleration over a shorter distance than he would have wanted. That would seem to have resulted in a broken hand. Ouch.

    Kids don't try this at home.
     
  2. jcsd
  3. Jan 1, 2009 #2

    berkeman

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    Pretty cool. Do you have a link to the video? I didn't see one at the news story page, but could have missed it.

    Pretty good comment by Robbie Maddison about Robbie Knievel -- I've heard that same comment from most of the distance jumpers.
     
  4. Jan 1, 2009 #3

    berkeman

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    Holy Cow! Here's the video that was linked to via Thumpertalk.com



    I'm still shaking. Pretty funny that one of the announcers lost it and used the f-word in his commentary right after the jump. Can't blame him, though. Wow.
     
    Last edited by a moderator: Sep 25, 2014
  5. Jan 1, 2009 #4
    it didn't look all that impressive me when comparing to other stunts.
     
  6. Jan 1, 2009 #5

    LowlyPion

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    I'd have a lot more confidence in the upward trip. Gravity is something you can count on to slow you on the way up. In fact his landing in relative terms was pretty light.

    Unfortunately on the way down gravity is something you can count on to get out of hand quickly. His window for error was pretty small, and his slight overshoot was nearly a 911.

    The jumping the football field looked a bit more difficult skill-wise from last year because of the opportunity to rotate about one axis or another. That jump was definitely not the time to be doing a Can Can or a Superman Seat grab or a Dead Body.
     
  7. Jan 1, 2009 #6
    My friend was literally just down the street when he did this.
     
  8. Jan 1, 2009 #7

    berkeman

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    Have you ever personally done what I'm doing in my avatar?

    The challenge in all of these bigger jumps is to have good pitch control over the bike, even with weird pitch ranges like the step-up or step-down. You have some control over your pitch by spinning up or stopping the drive train and back wheel, but if you don't have it close to right at takeoff, you won't have enough adjustment range in the air.

    Fun variation on jumping, IMO. I was shaking watching him circle around and around before doing the step-down takeoff. Crap, I'm shaking just typing this.

    My longest straight-line MX jumps are around 55-60'. My longest step-down is probably 45-50', and my longest step-up was probably 45'. Not real long in terms of the big MX tracks, but still gets your adrenaline going, and still requires some skills built up over the years.
     
  9. Jan 1, 2009 #8

    russ_watters

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    Me neither. There is very little danger in the ascent because the bike is only really jumping about 10' and the landing is soft - the entire rest of stunt is just a straight run up a ramp.

    With a more normal jump, you spend a lot more time in the air, are moving faster, and hit the ground harder.
     
  10. Jan 1, 2009 #9
    No I haven't and I don't think this stunt is easy. I'm just saying that comparing to other stunts that he has done in the past this one didn't look impressive.
     
  11. Jan 2, 2009 #10

    berkeman

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    I guess I should acknowledge your point. Especially with Russ agreeing with you. Fair enough.

    Just speaking as somebody who spends a lot of time in the air, working your way out on tables is a bit more comfortable (a realative term of course) than working your way up on step-ups. And that step-down cliff .... okay, I'll find something SMALL to play on like that to see what it's like. MotoBark can do it...

    http://www.thumpertalk.com/forum/member.php?u=20583


    .
     
    Last edited: Jan 2, 2009
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