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Hence my question of a methodology/formula for establishing the loss of or increase of aereodynamics for a given frontal area.
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The formula is Cd x A = CdA. Establishing Cd is a black art.
Maybe what you are looking for is A[sub]tow vehicle[/sub] / A[sub]towed vehicle[/sub] x [fudge factor]. I don't know about that, as long as it's greater than 1 you should be good.
For inspiration you could compare the classic Airstream to the
Airstream Basecamp. It is a very utilitarian vehicle reminiscent of the
Rumpler Tropfenwagen.
