View Single Post
Old 05-09-2015, 06:51 AM   #8 (permalink)
Needs More Duct Tape
MPGomatic's Avatar
Join Date: May 2012
Location: the swamps of jersey
Posts: 157

Slambo - '99 Honda Civic HX
90 day: 44.21 mpg (US)
Thanks: 63
Thanked 82 Times in 43 Posts
Originally Posted by aerohead View Post
*The path down the sides of a car is the shortest and most direct route the air can take to the rear.
*Allowing the air to flow as smoothly as possible there ensures the lowest drag.
*If the pathway is interrupted with a void (behind the front tires) we lose the flow right there.
*There will be reattachment downstream,but that pocket of turbulence has to be paid for with extra drag,continuously as we drive.
*Truly low-drag forms will have flush sides,or better,fully-enclosed flush sides,apart from any Coke-bottling done for pressure control.
Great stuff, Aerohead! What about influencing the air that comes off the tires out of the wheelwell/away from under the car with a gentle sweep by integrating a small flap at the back of the wheelwell that blends into the skirt? Instead of a 90 angle, it might be 100?
  Reply With Quote