[s-cars] alignment Q

[pkrasusky at ups.com]

Interesting on the surface area Bob.  Guess I shoulda stayed awake during Physics - too busy doing funnels (etc.) before school - sigh.

Sorry, I should have mentioned rules dictate use of supplied wheels, axles (sans modification), and no bushings / bearings.  Can use graphite which we are.

Tx.

-Paul


-----Original Message-----
From: Robert Myers [mailto:bob at chips-ur-s.com]
Sent: Thursday, January 15, 2009 9:35 AM
To: Krasusky Paul (WQQ2PXK)
Cc: djdawson2 at aol.com; s-car-list at audifans.com
Subject: Re: [s-cars] alignment Q

Dredging faint memories from my sophomore physics class ISTR that
friction forces are the result of coefficient of friction times the
"normal force".  Normal in this sense means perpendicular to the
surface.  The surface area has no part in the process.  Whether the
contact patch is razopr narrow or somewhat wider should have no effect.

Internal friction (from compression and relaxation of internal forces
when the rubber tire is flexed should be much lower for the virtually
rigid plastic "tires".  This should then reduce frictional drag from
the wheels rubbing on the axles.

A bushing?  Perhaps machine a slightly larger diameter
axle?  Elimination of wobble should help significantly by reducing
the normal forces of the wheel sliding on the axle.

Do the rules permit lubrication of the axle?