Thread: Roof Spoiler
View Single Post
Old 08-26-2020, 12:21 PM   #18 (permalink)
aerohead
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 16,250
Thanks: 24,380
Thanked 7,358 Times in 4,758 Posts
seems

Quote:
Originally Posted by 2000mc View Post
https://youtu.be/Fq8hkPobpes

Take away seems to be “roof spoilers are just stupid”
* An American Motors Javelin had a cosmetic roof spoiler which made no difference to performance.
* One Toyota Celica Supra also had an iconic, cosmetic roof spoiler, also of no effect.
* Mercedes-Benz built a 190 Evo, with a combination roof spoiler, rear wing, which was effective aerodynamically.
* Today's SUV rear spoilers have been shown to affect drag.The further back they reach, along the Kamm-Back contour, the lower the drag and lift. You can see it between the Porsche Cayenne and Toyota RAV4. The Porsche is Cd 0.36, while the RAV4 is Cd 0.30, and Toyota went to great pains to extend the D-pillar extensions back, almost to the Kamm truncation line.
* As MetroMPG emphasized years ago, we ought to take vehicles on a case-specific basis, and steer away from generalities.
__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote