Quote:
Originally Posted by winkosmosis
I was about to post this idea. You'd want the PVC to blend smoothly into the sides though, so I was thinking 180 deg of PVC... although that might create a parachute effect between the pipes.
You could do this kind of thing also, like what some Volvo trucks have. It would prevent the flow from fanning out like when you hold a spoon under running water
 |
Rather than vanes,out in the air,they can be fastened to the leading edges,upstream and will soften the corners as Moller did with the original VW van,dropping the Cd from 0.75 to 0.42.
In Hucho's text he displays a graphic which demonstrates the proper minimum radius for attached flow,as a function of the bodies width.It's surprisingly small.Sorry,didn't bring the book with me.
P.S. the later produced VW Vanagon leading edge radii were developed from this very article.