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Sometimes boundary-layer turbulators can save a marginal taper from separation. The Aero-Gare prototype flew OK, but they had to rough up the production ones to keep them flying straight, as they would develop separation on one side or the other.
I was surprised that the first bit of advice I got from a PhD who earned it was to avoid using a skin-on-frame nose cone like a glider, because gliders only get away with it by not having crosswinds like cars.
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There is no excuse for a land vehicle to weigh more than its average payload.
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