[aerohead]

Originally Posted by kach22i

I think that "Box Cavities" can be made to work.

There was a thread on it a while ago, several articles/PDF's were posted.


Box Cavity for a pick-up truck
http://ecomodder.com/forum/showthrea...uck-26367.html

In that thread above is one of my favorite images discovered by participating this forum.

Automotive Aerodynamics: Drag Area – Size Matters


The VW van tail does not follow the aero-template and is open ended, yet I am told by a forum member familiar with the project that it worked quite well.

EDIT: gumby79, your description is similar to Aeroheads, net positive gain I think?

http://ecomodder.com/forum/showthrea...k-26367-3.html

That was my neighbor's,the late Bob Parsons.It had curvature in plan and elevation.1/2" EMT skeleton,covered with doped Dacron,sewn by his wife Jacque.
Bob 'n wife went to the Yucatan Peninsula each year in it.He saw upwards of 28-mpg.None of the other Vanagon owners (mostly Germans) believed his claim.
I've never heard of another Vanagon getting over 24-mpg.