View Single Post
Old 12-01-2009, 01:11 AM   #16 (permalink)
pgfpro
In Lean Burn Mode
 
pgfpro's Avatar
 
Join Date: Apr 2009
Location: Pacific NW
Posts: 1,544

MisFit Talon - '91 Eagle Talon TSi
Team Turbocharged!
90 day: 63.95 mpg (US)

Warlock - '71 Chevy Camaro

Fe Eclipse - '97 Mitsubishi Eclipse GS
Thanks: 1,304
Thanked 597 Times in 386 Posts
Quote:
Originally Posted by aerohead View Post
If it's at all possible,I would encourage you to tuft-test the tail before you commit to the design.
Anything above 20-mph ( on a dead calm day ) will tell you what you need.
It's hard to tell from your photos,but it looks like there is a sudden,angular transition at the roof,and reflex at the sides especially below the beltline.
If so,you'll have immediate separated flow ( exactly what you're not looking for ).The flow will reattach on top with some efficiency loss.I'd be suspect to the sides,as there is not as much energy available to sustain flow.
What you've mocked-up holds much promise,and a quick test would soon tell you whether or not to cement your design.
Heres another pic of the roof line. You can see it better from this angle. Its very slight in the transition, but mabye it needs to be more level with the roof line???

__________________
Pressure Gradient Force
The Positive Side of the Number Line

  Reply With Quote