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And?
Not sure of the science. I always attributed getting tossed over the bars from shitting my
pants so hard it caused a massive forward and vertical thrust. I could be wrong.
The Shop
Scrubbing keeps you lower because the rider is initiating a down ward trajectory (falling over sideways) to take away from the upward trajectory. It makes the wheels/bike/rider lighter in a sense. That along with the bike leaving the jump face earlier in its slope, you are not riding the jump face as high and long.
The more energy you push into the bike and face of the jump the more energy is released when leave the face of the jump. Just my take, and I'm no engineer, but seems reasonable to me.
Normal jumping, or jumping and absorbing the energy with your legs going into jump faces typically don't drive suspension and bike all the way to the limit as you do when seat bouncing.
Try seat bounce with a softer rear spring that runs full stroke already when front wheel hits the bottom of jump face = no difference from jumping regular. You can way faster and more aggressive into jumps with to soft springs since there is limited rebound effect.
Damn I miss that guy. So many epic discussions/arguments at the races and on the old boards.
Carry on.
Only time I hold the rear end compressed all through the jump face is when I need to get extra clearance for the front wheel l, like placing it up on top of a big step up when jump face I take of from is to level.
The longer you hold the rear end down, the steeper the angle of your trajectory is which means easier to at least get the front wheel on top of the last jump.
Changing the trajectory is of course part of the normal seat bounce but to lesser extent than above.
Good example was this week's jump before finish line. Guys needed height, not only distance, to avoid double bounce before passing finish line.
Pit Row
Edit: You started that whole shit show, lol.
Now, who has a good slomo video of someone seat bouncing?
The simplest and most accurate explanation is a combo of several things already mentioned.
1. harder than normal acceleration results in higher speed at liftoff
2. rear of bike is compressed further than normal due to rider weight back, "smashing" it down
3. angle of attack off end of takeoff ramp is higher due to rear of bike being lower
4. all of the above results in a higher trajectory, thus being able to travel further in the air
Edit: damn I don’t know how to put video on
If you have been testing rear shock suspension and going back and fwd between spring rates is becomes very obvious. If I setup a 42 spring with 10mm preload I can set up a tent on my rear fender and camp there during take off and still come up short/low, not much help. If I put on a 50nm with 5mm preload and even hint at seat bouncing I will find myself flat landing a bike length to long on the same jump.
on seat bouncing.
It needs to be one of those turns that’s right at the exit of a 180 SX “bowl turn” at a ATL or Dallas SX type track.
Not that I have an opinion on the matter...
Post a reply to: Seat bounce