Quote:
Originally Posted by UnicycleDan
Thanks backpacker3. Do you know, when coasting to a red light or stop sign, would it be more fuel efficient for me to flip to neutral? Or would that not help much in an automatic while I'm still moving? I'm comparing this in my mind to a lesser version of EOC, which I shouldn't do with my automatic.
...And thanks aerohead. I'm back to the template, but I guess that's good, because the template is straightforward. I still find it very interesting, however, that even in the picture of the Golf/Rabbit, the Cd increases, then decreases again beyond a point, where a certain range of kammback angles would actually worsen aero drag compared to my chopped SUV back.
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Between 25-degrees and 30-degrees exists what Hucho refers to as a 'bistable' flow condition,where one second you have a fastback wake,then in an instant,a squareback wake,with the separation line dancing around between the two conditions.Real aerodynamic pandemonium.This range of angles are to be avoided like the plague.
Buchheim recommended an angle no steeper than 23-degrees under any circumstance.
Mair recommended 22-degrees as a maximum.
The 'Template' honors Mair's 22-degree recommendation.Here's his contour
