Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Compressed air for drag reduction ( Coanda slots )

Cd · 11-13-2009, 07:50 PM

The latest issue of Motor Trend ( December 2009 ) has a ( one page ) article on page 39 entitled 'Aero Blows' by Frank Markus .
The article states that in a series of tests using compressed air on the back of vehicles, drag was reduced by 36 % on an automobile, and an incredible 84 % on a semi truck.
The testing was done by Robert Englar at the Georgia Tech Research Institute.
Using compressed air not only reduces drag, but can also be used to better control a vehicle in a crosswind.

Another benefit is that there is no need for a boat tail at the rear of the car, or other add-ons such as spoilers.

I posted in the hopes that one of you guys might get some use out of the idea. I'd love to see a homebuilt version of this idea.

11-13-2009, 07:50 PM	#1 (permalink)
Cd Ultimate Fail Join Date: Feb 2008 Location: Austin,Texas Posts: 3,585 Thanks: 2,872 Thanked 1,121 Times in 679 Posts	Compressed air for drag reduction ( Coanda slots ) The latest issue of Motor Trend ( December 2009 ) has a ( one page ) article on page 39 entitled 'Aero Blows' by Frank Markus . The article states that in a series of tests using compressed air on the back of vehicles, drag was reduced by 36 % on an automobile, and an incredible 84 % on a semi truck. The testing was done by Robert Englar at the Georgia Tech Research Institute. Using compressed air not only reduces drag, but can also be used to better control a vehicle in a crosswind. Another benefit is that there is no need for a boat tail at the rear of the car, or other add-ons such as spoilers. I posted in the hopes that one of you guys might get some use out of the idea. I'd love to see a homebuilt version of this idea. Last edited by Cd; 11-14-2009 at 12:41 PM..