Quote:
Originally Posted by RobertSmalls
...Since theory predicts your coastdown will follow a second-order polynomial, choose that one....
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Yes, that is correct.
Just remember that if there is any wind present during the coast down, OR you are running on slightly non-flat roadway, then the resulting velocity decreasing curve will not fit on a nicely done poly curve.
As the speed decreases below, let's say 30 mph or so, the wind will start to predominate and skew the curve to a vastly different shape.
Take a look at the data I posted earlier for evidence of this. Both tail winds and head winds change the lower portion of the curve shape completely.
Just something to keep in mind when performing post testing analysis.
Jim.