Re: Wheelspin

[STEADIRIC@aol.com]

>No hard feelings, just hard facts.  I don't disagree that you get better
>acceleration in a roadcar by spinning the tires a little off the line -
>I'd be an idiot to argue with this fact.  But to say that traction is
>increased with "wheelspin" is not right.  "Slip", I will agree,
>increases traction.  "Slip" is not equal to "wheelspin".

Go back and take a look at the Delta V number....  It's less than 10% for 
a Street compound So for max acceleration from a stand still the tire has 
to be spinning 10% faster than Road speed....  Race tires which operate a 
smaller slip angles (on the order of 2-4/deg or % depending on 
acceleration direction) spin even less for max traction.  I think that 
the problem that your having with this is your equating optimum Wheelspin 
with tire smoking wheelspin.  The other proof of this is that max braking 
occurs when the tire is working at optimum slip which means that the tire 
is rotating 10% slower than road speed.  Try to kick that delta V up to 
11% you get lock up. And BTW Dragsters spin their wheels off the line....

Later!


Eric Fletcher
'87 5KCSTQIA2RSR2B
St. Louis, MO

STEADIRIC@aol.com