Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
Normal
I'll take a shot at it.Roll axis = If I push on the side of a buggy it will sort of rotate around an imaginary point in space. That is the roll center and sometimes called the roll axis.Roll axis angle (steer) = Ok, think of the half circle below as the arch that your wheels/axle articulates along. If your links are more or less parallel and your in the center of your shock travel you'll have very little rear steer because as the axle moves up and down it moves forward and back very little. Now imagine your links are already points down toward the axle (up toward the chassis). As the axle drops further it will move forward (toward the center of the rig) as it moves through its arch. When one side does this and the other side it up you get an axle that's not perpendicular to the buggy and it steers. (Personally, I think this isn't really work worrying about for rock racing/crawling.)Instant center = Take your upper and lower links and find the imaginary point in space they would touch if they kept going forward. That's your instant center. It's used, along with COG and wheelbase, to determine your anti-squat. (my post above has a link to a writeup that I thought was easy to understand)Disclaimer: I'm not a race car engineer, this is just based on my research and a little hands on work too.The numbers look ok to me. The AZ guys shoot for lower anti-squat numbers. If you wanted lower AS numbers you would need to move your instant center down/forward. The easiest way is probably to raise the lower link on the axle side.
I'll take a shot at it.
Roll axis = If I push on the side of a buggy it will sort of rotate around an imaginary point in space. That is the roll center and sometimes called the roll axis.
Roll axis angle (steer) = Ok, think of the half circle below as the arch that your wheels/axle articulates along. If your links are more or less parallel and your in the center of your shock travel you'll have very little rear steer because as the axle moves up and down it moves forward and back very little. Now imagine your links are already points down toward the axle (up toward the chassis). As the axle drops further it will move forward (toward the center of the rig) as it moves through its arch. When one side does this and the other side it up you get an axle that's not perpendicular to the buggy and it steers. (Personally, I think this isn't really work worrying about for rock racing/crawling.)
Instant center = Take your upper and lower links and find the imaginary point in space they would touch if they kept going forward. That's your instant center. It's used, along with COG and wheelbase, to determine your anti-squat. (my post above has a link to a writeup that I thought was easy to understand)
Disclaimer: I'm not a race car engineer, this is just based on my research and a little hands on work too.
The numbers look ok to me. The AZ guys shoot for lower anti-squat numbers. If you wanted lower AS numbers you would need to move your instant center down/forward. The easiest way is probably to raise the lower link on the axle side.
