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Old 02-12-2021, 02:02 PM   #33 (permalink)
aerohead
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1993, Hucho & Sovran on low drag

AERODYNAMICS OF ROAD VEHICLES, in Annual Reviews Fluid Mechanics, 1993, pp. 485-537, Hucho and Sovran:
repeats Hucho's comment from his 2nd-Edition book, December, 1986.
' lower ( Cd ) values are possible. Whether or not they are feasible for any particular car is more a question of consistency with the vehicle's design concept than it is of aerodynamic capability.
As of 1986, Hucho claimed Cd 0.07, as the floor for an automotive drag coefficient. Body elongation and integration of the wheels into the body would be the pathway.
Wing or half-body shapes would be our only two options.
'Laminar' bodies have insurmountable outward vision challenges.
The 'Morelli' form, failed to deliver lower drag, when put to the test of an actual motor vehicle.
My contention remains, that wing-like automobiles would be highly problematic with respect to internal packaging efficiency versus overall dimensions, leaving the half-body as the likely candidate.
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