How much of a radius to keep flow attached on aero bed cover?

[thatguitarguy]

Google Phil Knox. I think he achieved some success.

[Fubeca]

Thanks for the input metrompg - I'm hoping to follow the general shape of Bondo's since his truck is more similar to mine that Phil's. After reading through his comments, I noticed that his first try was too steep and didn't really help his economy - I'm trying to avoid this.

thatguitarguy - thanks for your comments. As I mentioned in the first post, I've read everything I could find on this site regarding aero bed caps, including much information from Phil and others referring to him. I asked the questions to get clarity around a couple of concerns I had before building this and to get pointers and encouragement from the members of the board.

[aerohead]

check out the "aerodynamic streamlining template".It's created so you don't have to guess about anything.Kind of a go-no-go.
You CAN make the curvature MORE gentle although there will be some penalty to drag.
Also,if you sweep the sides in gently,you can gain even more.Mine is good for 13% mpg interstate.

[winkosmosis]

Rather than waste energy trying to curve the whole thing, IMO the better idea would be to radius the transition from roof to cover, then go straight to the tailgate.

[aerohead]

Originally Posted by winkosmosis

Rather than waste energy trying to curve the whole thing, IMO the better idea would be to radius the transition from roof to cover, then go straight to the tailgate.

I don't have a problem with that as the original shell was done that way.
As long as the "transition" curvature is there,the rest is a walk in the park,just like Kamm and the others claimed.
Curves are stronger,so the shell can be the lightest,although execution in man-hours could be measured geometrically.