Dave,
I'll do a bit of thinking on this. But there are several problems I can
thnkof right off the bat, that will need to be ovecome. One is the rubber
compound being used under the skid. Soft or hard would play a big role in
determining the coefficient of friction. Then there is the problem of loose
salt under the skid, a condition most likely on the actual race surface.
These can be estimated tho, maybe...HArdness, what would we relate that to?
Take for example, old concrete vs new concrete...how to tell the difference
there and what effect it has? I am in the dark here with zero knowledge on
the subject. For me, traction is a weight thing (normal force) but what I
would like to investigate is rolling resistance. If I had a data system like
yours and my car with the front struts and trailing link, I would find a way
to put strain gages on that link so that I could convert the wheel rolling
force to strain and load. I would then vary air pressure in the tire and
make several runs, do that for as many conditions as I could think of, and
maybe even different tires to get a set of numbers that could be related to
rolling resistance. Or build a "trailer" with a load cell between the tow
and it to measure rolling resistance. Could add and subtract weight to
change the parameters. Lots os stuff. Maybe I'll look into it...
mayf, the really red necked ignorant desert rat
Subject: Re: Air density and rolling resistance.
. Ok Mayf how do we easily measure the
> available traction and hardness. I have 2 ideas. For traction a small
weighted
> sled with rubber on the bottom and a pull scale. measure the breakaway and
> sustaining force to move it along the salt. Then a round metal ball may a
few
> pounds in weight dropped from a certain height and measure the diameter of
the
> imprint to measure hardness.. Could also measure the temperature and I am
sure
> someone would have a way to measure the moisture content at the surface.
With
> all the traction issues at Bonneville it really has to come down to where
the
> rubber meets the road for a lot of people
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