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Originally Posted by skyking
I think it needs to be slower to really see a CD change, more like high 40's or 50 tops.
What do you think?
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Cd is pretty consistent between a lower bound, depending on temperature and barometric pressure, probably somewhere around 20-25mph and transonic speeds—above 250mph. Shockwaves start to form, leading to those sharp pointy noses that are totally unnecessary on a road-going car. Fineness ratio too, land speed record cars have the proportions of a chop-stick.