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Watch someone do it and they wheelie a bit off the first table, then let the rear wheel drop a little and clip the face of the last jump. The suspension is so good they hardly feel it. The second arc on the sketch is not curved right.
Also when they are on the first table, they are driving hard for speed, not "bouncing." The faster you do it, the less wheel drop so its smoother.
I know this for a fact, there was an obstacle just like this that I was struggling with. I was landing on the closest edge and trying to drive off it, almost wadding everytime.
Good rider told me to jump all the way to opposite edge and let the bike do the work.
Believe it or not it worked.
Show us where Grant did a wheelie in Bercy. Rear wheel doesn't clip the lip, especially in the last sequence, when they both do it.
(I think you were there.)
Hell of an optical illusion.
http://www.youtube.com/watch?v=xtawj3shSzE
Or, this from the same lap
BTW, Newtonian physics says that Grant should augur in - front wheel, rear wheel, some part of him and his bike - a few FEET below the lip, in the absence of some upward, gravity-defying, force (IOW, shoot a 300lb bowling ball level flat off the top of the first table at 40mph and see where it impacts the second).
This isn't something that I just "feel" but isn't happening....It can be measured by how high you jump on the trampoline.
Opposite of absorbing the bike on take off. Here you absorb the bike with your legs making yourself "lighter" than you are.
Same thing with steady throttle going off a jump vs gasing it real hard. Its not so much the acceleration, but when you gas it you are driving the bike in to the ground harder...more force...making the package of bike and rider "weigh more."
If you want to know how a spring works, then you have to know something about Hookes Law.
Although many here, especially TFS, will debate this to dead, if you compress a spring it will then have stored energy.
When the compression is released, it expands energy.
Explains the seat bounce to a T.
http://www.4physics.com/phy_demo/HookesLaw/SlopeK.gif
Pit Row
His real wheel clearly drops. Gravity does not stop working. The chart showing the bike arc after the tabletop is wrong.
It is possible to get across the gap without the rear wheel dropping enough to clip the jump hard due to speed. The faster you do it, the less time the wheel has to drop.
Also, due to the angle of the camera, you can't show the first table to be flat with the horizontal. That is only an assumption required to make a "miricale."
Nice try.
Whippy has been trying this ever since he flipped out at me and got abusive over losing a seat bounce argument years ago, which he says he doesn't remember...
.
All you guys that keep "discovering" Hooke's law need to understand it.
You are neglecting damping, which is shown by R above.
Hooke's law applies to an "ideal" spring with no losses and no damping.
If you press the mass M against the wall, the spring pushes back, but the damper slows the motion and there is the equation to figure it out....
Someone mentioned a trampoline. You are basically bouncing on a spring (or many small springs) when you use a trampoline. How high can you bounce on a trampoline with springs vs a trampoline with no springs?
i crossed the finish line and that's all that mattered at that point in time
If a shock was capable of springing bike and rider off the ground and over a jump, why does the same bike not flip ass over end in the whoops?
Because the shock is dampened
If you press down on the seat of a bike with enough force and release it, will the bike leap off the ground?
No, it doesn't
Because the shock is dampened
Some of you constantly and consistently leave out that one important fact.
You've never seen this happen? I think I remember seeing it a few times...are you new to MX?
If someone goes blazing into the whoops leaning back with legs locked and arms locked (i.e., static position) you think they'll make it through with out endoing or looping out?
My bad
I have a cold and feel like shit
Fast or Fiction
I would not be able to bunny hop a 200 pound bike that had a solid suspension over a puddle but because I can load up the spring and get "some" help from the rebound I am able to lift if off the ground and over the puddle by rapidly moving from a standing position to a sitting position which squats the bike and loads up the spring then immediately going back to a standing position much like you would do if you would jump off the ground without any bike under you.
The rebounding of the suspension makes the bike light under you when your legs reach their maximum extension, enough so that you can coax it off the ground slightly (or more accurately keep it from dropping as much), enough to clear a puddle without making a splash. Without doing the hop (using the suspension for help) you would splash all the water out of the puddle. If you don't believe me go try it.
You turn the dampening all the way out on a dirtbike and it will literally throw you over the bars in a set of whoops.
Post a reply to: Seat Bounce. Fact or Fiction?