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Originally Posted by hypermiler01
But I am sure that everyone here, including yourself, is already well aware that the required angle of taper is not the same for all speeds, but varies in direct proportion to speed, and that what I said about faster speeds needing a longer, more gradual angle to prevent detachment is the truth.
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At the speeds automobiles travel, Cd is effectively constant.
Otherwise we'd be provided qualifying data (test speeds) by automakers & testers to put their figures in context, and without that context it would be impossible to compare different vehicles' drag coefficients to one another.
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The drag coefficient can be considered constant for objects moving at high Re, e.g. a car at highway speed - source
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When the flow is turbulent the Reynolds number is large, and the drag coefficient CD is approximately constant. - source
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Quote:
Originally Posted by aerohead
drag coefficients are stable up to transonic flow
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I'll be the first to admit I'm far from being an expert in the subject of aero, but that seems like a pretty fundamental concept.