Re: Wheelspin

["Jeremy R. King" <jrking@ces.clemson.edu>]

OK, I'll quit.  I've got a similar graph of slip vs. normalized tractive 
force in the Milliken book.  I guess I'm just stuck on the mental image 
of wheelspin as something that happens AFTER traction is lost (which 
Milliken seems to back up).  But the way you and eric are stating it - 
the difference in velocities - is right (not that you needed me to back 
you up for it to be, and not that eric hasn't been saying this all 
along).  Sorry to draw it out.

On Fri, 20 Sep 1996, Graydon D. Stuckey wrote:

> 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
> 
> 
> 

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Jeremy R. King  Clemson University, S Carolina, USA
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