Posts
213
Joined
10/12/2006
Location
Shenandoah Valley, VA
US
crashomatic
11/10/2012 8:45am
11/10/2012 8:45am
Edited Date/Time
11/13/2012 6:01pm
Haven't been here for a long time. I'll throw this out there just to bend your brains a little.
Just saw this slow-mo video and thought of an age old debate about magic shock springs and seat bouncing.
TFS & Nerd had it all figured. I of course had a complete lack of understanding of Newtonian Physics and Dynamics after a failed education and degree in Mechanical Engineering. (That is to be read rhetorically.)
For the life of me, given the infinite wisdom of those two, I can't seem to use their explanations of rebound and center of gravity and maximization of ramp projectile magical physics to explain how mookies bike bounces off a flat surface. (Again, read rhetorically.)
TFS gave us a sound mental experiment. Strap a bike to the floor fully compressed and then cut the straps and the bike will rebound zero inches off the ground because the dampening of the suspension. Therefore seatbouncing is a mysterious physical phenomena which alludes us. We feel like it comes from the springs and the rebound, but this just isn't the case according to the All knowing, All powerful, Infinite wisdom of the resident photographers.
Is there a problem with Mookies suspension setup? Is it not properly damped? How does that rear wheel come off the ground before the rear suspension has fully rebounded at 2:15?
Magic Springs?
Is it possible for a rider to use this magic moment caught on camera? Instead of the bounce on the landing, use it on take off? Could he load the rear suspension on the face of a jump, and then just prior to the launch of the jump, unload the rear suspension and get a little extra BOOST? A seat bounce?
Is it possible to have a bike take off from the ramp before the rear suspension has completely rebounded? Thus LIFTING OFF the ramp rather than merely rolling off the end of the ramp?
I have no idea if this will connect with anyone. It was a fun debate years ago and led to a very fun exciting application of high school physics with a complicated twist of fluid dynamics.
Enjoy!
http://www.racerxonline.com/2012/11/09/malcolm-stewart-at-1000-fps
Just saw this slow-mo video and thought of an age old debate about magic shock springs and seat bouncing.
TFS & Nerd had it all figured. I of course had a complete lack of understanding of Newtonian Physics and Dynamics after a failed education and degree in Mechanical Engineering. (That is to be read rhetorically.)
For the life of me, given the infinite wisdom of those two, I can't seem to use their explanations of rebound and center of gravity and maximization of ramp projectile magical physics to explain how mookies bike bounces off a flat surface. (Again, read rhetorically.)
TFS gave us a sound mental experiment. Strap a bike to the floor fully compressed and then cut the straps and the bike will rebound zero inches off the ground because the dampening of the suspension. Therefore seatbouncing is a mysterious physical phenomena which alludes us. We feel like it comes from the springs and the rebound, but this just isn't the case according to the All knowing, All powerful, Infinite wisdom of the resident photographers.
Is there a problem with Mookies suspension setup? Is it not properly damped? How does that rear wheel come off the ground before the rear suspension has fully rebounded at 2:15?
Magic Springs?
Is it possible for a rider to use this magic moment caught on camera? Instead of the bounce on the landing, use it on take off? Could he load the rear suspension on the face of a jump, and then just prior to the launch of the jump, unload the rear suspension and get a little extra BOOST? A seat bounce?
Is it possible to have a bike take off from the ramp before the rear suspension has completely rebounded? Thus LIFTING OFF the ramp rather than merely rolling off the end of the ramp?
I have no idea if this will connect with anyone. It was a fun debate years ago and led to a very fun exciting application of high school physics with a complicated twist of fluid dynamics.
Enjoy!
http://www.racerxonline.com/2012/11/09/malcolm-stewart-at-1000-fps
I wonder what would happen if the bike were to hit a 4" tall bump traveling 40mph when you cut those straps.
/thread
Duuhhh.
The Shop
JMHO
And a big thumbs down on the endo scenario when it goes wrong lol.
Pit Row
https://youtu.be/nYEEIOiZhJo
Could the great seatbounce controversey be solved? Next thing you know Bigfoot will hold a press conference.
Now I can bunny hop my street bike with a bit of weight transfer and a quick blip/slip of the clutch. Be it only mere inches off the ground but the rebound, combined with the acceleration plus my body weight pulling up is a greater force than the 400lbs holding it to the earth (gravity).
Trials motorcyclists can do the same to an even bigger extent going 20ft across gaps to the back wheel off of a flat platform to a landing point equal if not greater in height. Comes down to timing, balls and body weight transfer.
Post a reply to: Magic Springs and Seatbouncing are back!