[ QUOTE ]
Goran,
Just to check I've got it right,
100% Ackerman = both wheels steer the right amount for the turn radius (is this also reffered to as 'true' Ackerman?)
- Ackerman = Inside wheel steers less than turn radius
+ Ackerman = Inside wheels steers more than turn radius
Is this correct ? /ubbthreads/images/graemlins/smile.gif
[/ QUOTE ]
That’s right. But in my example I used the term + and - for the direction of the adjustment needed. For a street car and even if driven fast, regular Ackermann appear the best.
In racing, or when driven with slip angle through all corners, special Ackermann settings should be used.
If we talk racing for a while....
Ackermann is closely related to toe settings. Different toe may be used for creating "turn in", and Ackermann was related to the slip angle of the front-outer wheel. Now, if different toe is used, this will affect the Ackermann needed.
Even the whole car could be said to have a "slip angle" which is the angle position of the car body in relation to the radius, and depend on the over-understeer of the car in question. The more oversteer, the less toe-in position is needed not to create roll-drag in the steering direction.
Whats said will not make anyone an Ackermann expert, by maybe put some light on whats going on, which hopefully is good enough.
Howard, didnt you reffer to my site,
http://hem.passagen.se/hemipanter/?
Goran Malmberg