I can't jump any longer than 40 feet!!!
- Thread starter Dvraptor
- Start date
whoops,
you said "But, since we are talking about trajectory the riders have to go up before they go down."
trajectory is the affect that gravity has on an ascending object, and gravity pulls all objects at the same rate. therefore it will decelerate a rising object, and then accelerate it downward at the same rate, that's your tracectory, however as anssi stated fat guys have to get on the gass more on the face of the jump to maintain the same upward rate, if properly set up the suspension should have the same affect on both. Of course you can preload, "de-load" and all kind of other tricks to use the return of the suspension springs to add more lift.
If you're still a doubting thomas, either ask a teacher if you're in school, or go to the local community college and ask a physics professor, I'm sure they are are more adept at simplifying the explanation.
you said "But, since we are talking about trajectory the riders have to go up before they go down."
trajectory is the affect that gravity has on an ascending object, and gravity pulls all objects at the same rate. therefore it will decelerate a rising object, and then accelerate it downward at the same rate, that's your tracectory, however as anssi stated fat guys have to get on the gass more on the face of the jump to maintain the same upward rate, if properly set up the suspension should have the same affect on both. Of course you can preload, "de-load" and all kind of other tricks to use the return of the suspension springs to add more lift.
If you're still a doubting thomas, either ask a teacher if you're in school, or go to the local community college and ask a physics professor, I'm sure they are are more adept at simplifying the explanation.
Okay, I got it. Actually it all came back to me in the shower this morning while remembering a target shooting discussion. I confused velocity and the energy required to generate velocity. :silly:
So, getting back on topic, the simple answer is, plus or minus suspension settings and/or rider preload, more velocity. :)
Whoops
So, getting back on topic, the simple answer is, plus or minus suspension settings and/or rider preload, more velocity. :)
Whoops
Armadas Racing
Member
- Aug 16, 2000
- 20
- 0
the nitty gritty of physics
I found this web page that deals with the same physics that one of the members talked about (BIG rider vs. smaller rider when doing jumps) and is quite interesting....just take a few moments to read the page and it will give you an in-depth understanding of motion in air!
http://home.hiwaay.net/~ispellan/AirgunBC.html
I found this web page that deals with the same physics that one of the members talked about (BIG rider vs. smaller rider when doing jumps) and is quite interesting....just take a few moments to read the page and it will give you an in-depth understanding of motion in air!
http://home.hiwaay.net/~ispellan/AirgunBC.html
alanreeves
Member
- Nov 10, 2001
- 88
- 0
There are different ways to hit a jump but to go far you should follow a few simple points:
you need to ba ACCELERATING smoothly from the flat all the way up the face of the jump.
you need to load the suspension as the bike meets the ramp by pushing down on the pegs and keeping your body rigid, as the bike is pushed up toward you you feel the force build up untill the suspension nears the bottom of its stroke (this stores loads of energy in the springs which flies you longer)
and reduces the effective angle of the ramp.
as your front wheel leaves the ramp try to "row" your body backwards, this will help keep the rear shock loaded as long as possible as the rear tire leaves the lip and prevent a hard front wheel landing
hope this helps... "practise makes perfect":)
you need to ba ACCELERATING smoothly from the flat all the way up the face of the jump.
you need to load the suspension as the bike meets the ramp by pushing down on the pegs and keeping your body rigid, as the bike is pushed up toward you you feel the force build up untill the suspension nears the bottom of its stroke (this stores loads of energy in the springs which flies you longer)
and reduces the effective angle of the ramp.
as your front wheel leaves the ramp try to "row" your body backwards, this will help keep the rear shock loaded as long as possible as the rear tire leaves the lip and prevent a hard front wheel landing
hope this helps... "practise makes perfect":)
my two cents worth
Two guys weighing different amounts hitting the take off at the exact same speed and line would jump exactly the same, all things being equal. All things are not equal though. One guy is going to get a little more boost at takeoff, due to a different suspension setting. I used to race BMX, and we could hit jumps all day long, at the same speed, with completely different results, by pre-loading differently for the jump, you will get a different lift resulting in a longer or shorter jump.
I suck at physics, but I'm fantastic at trial and error. :)
Two guys weighing different amounts hitting the take off at the exact same speed and line would jump exactly the same, all things being equal. All things are not equal though. One guy is going to get a little more boost at takeoff, due to a different suspension setting. I used to race BMX, and we could hit jumps all day long, at the same speed, with completely different results, by pre-loading differently for the jump, you will get a different lift resulting in a longer or shorter jump.
I suck at physics, but I'm fantastic at trial and error. :)
High Lord Gomer
Poked with Sticks
- Sep 26, 1999
- 11,788
- 35
Re: my two cents worth
If they had their suspensions set up correctly for them, they should get approximately the same result.
If they had their suspensions set up correctly for them, they should get approximately the same result.
*That* would be an excellent signature line!
- Thread starter
- #38
stiffnes also plays in...
You'r bodystiffnes during takeoff will also affect angle and height.
Loose body = short and low
Stiff body = long and high
Explained better by Motocross action magazine this autumn
Be aware that this NOT include all bodyparts - for Your own safety...:eek:
You'r bodystiffnes during takeoff will also affect angle and height.
Loose body = short and low
Stiff body = long and high
Explained better by Motocross action magazine this autumn
Be aware that this NOT include all bodyparts - for Your own safety...:eek:
High Lord Gomer
Poked with Sticks
- Sep 26, 1999
- 11,788
- 35
Good point! For me, it's usually all I can do to make the distance, but it's cool to watch good riders use their bodies to absorb upward energy and fly lower / faster.
(If I ever get to where I can consistently overjump something, maybe I can try that) :eek:
(If I ever get to where I can consistently overjump something, maybe I can try that) :eek:
