Tailgate Net
Man, I wish I could find that link... I read an article a couple of years ago done by some guy that worked at some aerodynamic's place (space or plane related).
I'll keep lookin' but the jist of the article was he had done a study in a wind chamber or some such place on a truck. He talked about a "seperated bubble" or some such term. Basically with the tailgate up, you get this cyclone on it's side type of effect that makes the back of the truck look to the wind like it's kinda tapered to the back of the truck. If you open or replace the tailgate with a net, this bubble isn't created and you actally create a vacum right behind the cab causing more drag. If I remember correctly, with the tailgate down, it's a 5 or 10 percent increase in drag vs the tailgate up. I don't remember the stats on caps and tonneau covers.
Cheleri
I'll keep lookin' but the jist of the article was he had done a study in a wind chamber or some such place on a truck. He talked about a "seperated bubble" or some such term. Basically with the tailgate up, you get this cyclone on it's side type of effect that makes the back of the truck look to the wind like it's kinda tapered to the back of the truck. If you open or replace the tailgate with a net, this bubble isn't created and you actally create a vacum right behind the cab causing more drag. If I remember correctly, with the tailgate down, it's a 5 or 10 percent increase in drag vs the tailgate up. I don't remember the stats on caps and tonneau covers.
Cheleri
Well ladies and gents,
I didn't find the exact article I read but here is something showing pretty much the same thing (with pictures even!).
http://mars.acnet.wnec.edu/~ehaffner/did.htm
Cheleri
I didn't find the exact article I read but here is something showing pretty much the same thing (with pictures even!).
http://mars.acnet.wnec.edu/~ehaffner/did.htm
Cheleri


