Quote:
Originally Posted by Grant-53
"Aerodynamics of Road Vehicles" 5th Ed. copyright is 2016. The graph is cited from an article by W. A. Mair in 1978.
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Yes, in 1978 the National Maximum Speed Limit was 55 mph. At 55, air can follow a more abrupt angle than at 75. I'm going with the 15 degree quote, rather than the 22 degrees that was OK in 1978.