Quote:
Originally Posted by MetroMPG
The rear of the vehicle is where your largest gains are to be made.
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If it was possible to further round off the edges at the front there would be a large reduction in Cd.
With sharp edges at the front, the flow does not stay attached past the corners to the sides, which leads to a LOT of drag.
With something as boxy as this winnebago the drag reduction can be in excess of 40% just with rounding off the front.
There is an example in the introduction of Hucho's 2nd ed with a 1969 VW van.