View Single Post
Old 12-27-2009, 04:53 PM   #6 (permalink)
3-Wheeler
Master EcoModder
 
3-Wheeler's Avatar
 
Join Date: Dec 2008
Location: Southern WI
Posts: 827

AlienMobile - '00 Honda Insight
Team Honda
90 day: 80.05 mpg (US)
Thanks: 94
Thanked 558 Times in 191 Posts
Quote:
Originally Posted by Bicycle Bob View Post
Sail cars, like ice boats, really take off when hit with a good side gust. Getting the angles right takes you to what is in effect a negative frontal area, by sneaking the usual low-pressure zones up the side and over part of the nose. With cars, it is usually more a matter of minimizing negative effects, and maintaining stability. It is a big topic, one best kept in mind as a frequent complication while learning the other basics.
Hi Bob,

So from the above, can a boat tail help or hurt in a car application, regarding the change in CdA and side winds?

Certainly, MetroMPG's big gains in efficiency is nothing to sneeze at after his boat tail was added. And I'm sure he tested on calm days.

Thanks, Jim.
  Reply With Quote