Quote:
Originally Posted by JulianEdgar
You claim to be an engineer. Do some simple vectors and resultant drag forces based on these pressures and angles:
You'll be surprised how much attached flow pressures matter.
(They mattered less 30 years ago when there was so much rear separation. Update your references.) |
Again, what in the world will measuring the pressure profile accomplish towards lowering the Cd 0.25, down to Cd 0.09? Possession of a pressure profile implies that we have something of comparative nature with which to guide us. Up, down, or sideways.
If we agree that the roofline on the Insight is 'streamlined', we ought to leave it alone, other than extending its length, while boat-tailing the sides and diffuser, to achieve even higher pressure regain, higher base pressure, lower pressure drag, and lower drag.
A BEV Insight would lose the grille opening almost completely. The belly could be perfect. Tesla mirrors would help. Front skirts. Boat-tail. ( Three-Wheeler made a fine one! ) 80-mpg is not uncommon on a good day, at real highway velocity.
