Quote:
Originally Posted by OldSubi
Is CD the difference between the drag of a flat plate and the actual vehicle or Wikipedia just told me "the projected frontal area of the vehicle" so maybe its got to do with lower frontal area and its harder to improve a small low area compared to a bigger area?
I think a kilograms of drag at a set speed would be a more meaningful number.
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A flat plate has a Cd higher than 1.
A Cd of exactly 1 is like if you had a plate with the exact frontal area of whatever object and you move it along a frictionless, sealed tube that is looped around and is the length of the distance you want to travel. Aka it corresponds to the energy input you'd need to accelerate exactly the amount of air you displace.