Re: Wheelspin

["Graydon D. Stuckey" <graydon@apollo.gmi.edu>]

On Fri, 20 Sep 1996 STEADIRIC@aol.com wrote:

> >What your trying to say is right, eric.  You're just using the wrong
> >terminology.  In case you don't believe me (which is obviously the case), 
...
long discourse about traction, spin, wheelspin, spin doctors, etc deleted...
...
> Is the tire turning faster than Road speed? Yes it is, and that my friend 
> IS Spin......... And I have made it clear that you need to keep the tire 
> at a delta V of 10% for max traction otherwise it goes up in smoke.... 
> Looks like it's time to go back to class Jeremy.....
Jeremy,

	Eric is correct, even if you don't agree with his use of the term 
"Wheelspin" because the tire must turn faster than the vehicle, which by 
definition is wheel spin.  The AMOUNT of wheel spin is the critical 
factor, as that dictates the amount of tractive force the tire can 
transmit.  I did some testing of this very phenom, and have some charts 
from tire manufacturers that show tractive force as a function of 
wheelspin.  The actual value varies from tire to tire, but as Eric points 
out, it usually is around 10% slip for max. traction.  It is also quite 
interesting to see how gradually (or suddenly) the traction can drop off 
with too much wheelspin, or too little.

Later, ---------------------------------------------------------- 
Graydon D. Stuckey 	'85 Mazda RX7 GS, no toys 
graydon@apollo.gmi.edu 	'86 Audi 5000 CS Turbo Quattro, has toys
Flint, Michigan USA	'89 Thunderbird SC, lotsa toys