Quote:
Originally Posted by aerohead
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.  |
Ah well, that shows one difference between us. You'd rather read very old books, make up theories - and guess.
I'd rather test and measure.
It's just a pity that your theories and guesses have been believed by so many people here over a long time.
Your view that attached flow does not cause drag is just one of the many incorrect ideas you have promulgated.