Morgans wrote:


"Peter Dohm" wrote


It is not hard to believe at all--except for the proposition that either
trick (gate open or gate closed) works on all trucks at all speeds.


Trucks are not that different. Except for something like the old El
Camino, thy are mostly boxes on wheels, to the wind.

Sure, they have a small styling curve here and there, but most of them
are square chopped off behind the cab, and have tailgates about the same
height.


Weeeel, shoot. Princeton seems to have changes their web site.
They had one of the best on line aerodynamics sites I ever saw.
Looks like it turned into a book.
All that I could find is the lecture slides...


For visualization, right side top of page - Wind Rotor.
http://www.princeton.edu/~stengel/MAE331Lecture20.pdf