View Single Post
Old 04-07-2014, 02:04 PM   #24 (permalink)
Master EcoModder
aerohead's Avatar
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 15,889
Thanks: 23,967
Thanked 7,220 Times in 4,647 Posts
That bad

Originally Posted by graver555 View Post
It would really have the potential to hurt that bad? I find that difficult to understand how it would hurt that bad.
The square tubing could disrupt the air as if you had squared-off leading edges.Flow would separate,you'd have permanent attached vortices requiring continuous energy input,and you'd rob the aft-body of quality onset flow,compromising the boundary layer's ability to stick,as well as produce useful pressure recovery.
Here is Lay's 'box' on wheels.You can see that the square edges almost double the drag.VW got almost identical results.Fiat got exactly the same numbers,others too!
Photobucket album:

Last edited by aerohead; 04-07-2014 at 02:05 PM.. Reason: correction
  Reply With Quote
The Following 2 Users Say Thank You to aerohead For This Useful Post:
graver555 (04-07-2014), jeff88 (04-09-2014)