View Single Post
Old 06-09-2015, 06:14 PM   #40 (permalink)
aerohead
Master EcoModder
 
aerohead's Avatar
 
Join Date: Jan 2008
Location: Sanger,Texas,U.S.A.
Posts: 16,268
Thanks: 24,393
Thanked 7,360 Times in 4,760 Posts
crosswind stability

Quote:
Originally Posted by fbov View Post
My $0.02 - don't forget crosswind stability.

At issue is the tendency of a car in a cross wind to steer into the wind (stable) or away from the wind (unstable). Those familiar with Hucho know that a square-cornered box is stable, and a sleek teardrop is not. There's a reason Porsche 911's all have wings.

Looking at the trailer lead edge treatment, I'll wager the open end has the beneficial property of increasing drag in crosswinds. That's the trick; you can get stability from a low drag body by increasing drag in crosswinds.

This isn't something you want to learn on the road...

HAve fun,
Frank
I think that crosswind stability issues for teardrops is a dead issue since 1976,after Morelli's CNR work with Pininfarina.
Center-of-pressure issues were resolved with fin area behind the rear wheels,also acting as fairings.
I don't have issues with the truck and she's zero-lift also.Goro Tamai at MIT considered them extremely stable platforms.
Porsche 911s are pseudo fastbacks,with significant rear lift due to separation over the aft-body.They are not proper teardrops.
__________________
Photobucket album: http://s1271.photobucket.com/albums/jj622/aerohead2/
  Reply With Quote