Re: Centripetal F from friction

[Brian Whatcott <inet@INTELLISYS.NET>]

At 07:16 AM 11/1/01 -0500, John Denker wrote:
> /// Extend each axle to be a line not just a
> line segment.  If necessary (to account for different-radius wheels)
> consider the orthogonal projection of each line onto the plane of
> motion.  The point of intersection of these axle-line-shadows is the center
> of the motion.  What's the problem?
>
> Tilting of otherwise-ideal wheels does not even cause any trouble.


This certainly makes a useful start on the real world problem for vehicles
with pneumatic tires (though solid tires have the same issues, writ small.)

The next step is to establish the proportion of the reaction vector carried by
 each wheel, then apportion the tire 'slip' [so called] accordingly, to
account
for the behavior to  which Hugh Haskell alluded.

The tire tread can head in a direction up to 10 degrees different from the
rim's
heading, without contact slipping. Radials with their more flexible carcasses
'slip' more than cross-plies.