Re: On myths, physics and test data... - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: On myths, physics and test data...
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Posted by MJM [Email] (#872) [Profile/Gallery] (more from MJM) on Wed, 11 Oct 2000 16:27:40 Share Post by Email
In Reply to: On myths and test data..., 2Slow, Wed, 11 Oct 2000 13:34:45
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I'll have to find those SAE papers and take a look at them. Do you have them on hand? The only test reports I've seen were in R&T where they played with an S? class Mercedes repeating the accel and braking tests with and without ABS and TC. I'd have to hunt for the issue.

Lets discuss physics, and not just test results. Noting that your quote doesn't say anything about wedges, look at the physics involved. For a wedge of whatever material to provide any resistive force on a wheel it has to extert a force parallel and opposite to the cars motion, right? That force then has to be balanced by a friction force with the ground. How much friction does a pile of gravel have with the ground? Not very much. Besides, think about how easily it is to drive up the lip on your driveway or over a board. My oil-change ramps are 1x12's nailed together. If a 2-3" wedge of gravel/snow were providing any braking force, the wheel would just roll over it. A 13" wedge of gravel would slow the car! In fact, this is how the gravel runaway-truck ramps work.

The reason non-ABS works better on gravel then ABS does is more related to the example of a runner trying to stop on a floor covered with marbles vs. on say, concrete. A sliding tire pushes the slippery stuff out of the way and cuts down to the higher friction surface below, whereas a rolling tire will keep trying to slow down on the low friction upper surface.


Mike

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