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are doing but the PhDs explain the how and whatfor's. That'd be fun!!!
However, someone would have to warn the PhD's that no matter what they say, they are just going to RAKED over the coals! hahahhahahahha
But i still think that the force response / rebound from the rear shock is not directly what matters - its what it enables. And that is, once the rider has sat into the bottom of the jump and compressed the suspension to increase the upwards trajectory (key first factor which also reduces the jump absorbing energy from the bike), then by carrying the mass of the rider on the rear wheel, the rider can use the rebound of the front suspension + pivoting their body mass to also lift the front + the engines torque to pivot the bike around the rear wheel and also raise the front wheel - all of which increases the overall upwards velocity of the overall mass. You can tell because the bikes engine is higher off the lip. And if done well, the rider is also higher above the lip when their mass is leaving the lip.
As a side note rebound has to contribute a little and probably from both wheels - but i am not sure how much.
You just need to realise that you don't usually leave a jump with the suspension fully extended. In the fully extended state the spring force is so low that your damping slows the rebound speed right down. Rebound speed in the botttom part and mid stroke is much faster as the spring force is higher and damping is linked to velocity. And if the jump is under the wheels at the time the suspension is unloaded even a little it will be pushing up against it. The speed it does this will mostly be determined by spring rate, amount of compression and damping settings. Oh and the mass it has to lift.
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Once again, if you tie your bike down and bottom the suspension out, and then cut the straps, your bike will just rebound up at a normal rate, not push the bike off of the ground. That force doesn't change.
Rolling the power on lifts the front up and balances out the 'bounce' of the rear spring.
Not following that example of having the bike loaded with straps? Can't see how that is relevant to the difference between sitting and standing going off a jump. The force changes between sitting and standing because the riders weight is getting thrown into the jump face.
The rear wheel is spinning creating centrifugal force. By doing so the wheel itself wants to resist motion, therefore the spring and chassis are able to "push" off of it.
In Newtonian mechanics, the centrifugal force is an inertial force (also called a "fictitious" or "pseudo" force) that appears to act on all objects when viewed in a rotating frame of reference. It is directed away from an axis passing through the coordinate system's origin and parallel to the axis of rotation.
Then she turned around and looked at me like...... wtf are you doing ??
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When you sit, you couple your body's mass to the spring and add to the overall mass being moved by the spring. That increases momentum.
By sitting down you put your full weight of your body , into the bike, causing the suspension to compress and the CofM of the machine to be lower with the suspension compressed, and the result is an elevated tragectory... scrubbing is the opposite, because you lean the bike up the face, to reduce the load on the bike, and turn the wheel to flatten the bike.. there is little or no rider weight,as the rider is bending his legs to absorb the movement of the bike upwards.. the bike and body dont have the same path. If you think the is wrong, then scrubs and seat bounces dont exist.
Why beat an old, extremely dead horse, when there’s a new one?!?
Is he setting up to forcefully lift the bike?
As an old desert guy, I’m seeing a cure to the classic flying W, if I was coordinated enough to actually do it at the right place and time, lol.. or maybe it’d just let me endo while firmly in the seat..
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