|
I have Barnard's book. But from what I hear, the Hucho one is better (good luck finding it at less than $140).
Re: rear hatch angle, Barnard says: Drag is reduced with increasing angle up to the 10-15 degrees range (no exact figure is given). As you go beyond that, it begins increasing again and peaks around 30 degrees.
About a 30 degree angle creates more drag than any other angle. It's actually worse to have a 30 degree slope than to simply chop the vehicle off at that point.
Beyond approx. 30 degrees flow separates at the roof, and the drag is like that of a squareback.
|