Shawn D, can you rig up a couple quick charts showing the influences of pressure and friction drag at different speeds ... maybe one for "typical" aircraft and another for a "typical" car? Just enough detail to show where they come into play.
Nothing too fancy ... X axis in gradations of 50mph ... Y would be % maybe. You could even draw this with MS Paint, I'd think.
__________________
--- Bror Jace
|