A NACA duct turned around is not the ideal outlet design. A NACA duct is designed as a low-drag inlet on a surface with laminar and attached airflow. Have a look at the shape of real extraction hoods to see what an exhaust duct looks like. One of the Carroll Smith books has some good info here as well.
Keith Tanner Flyin' Miata [EMAIL PROTECTED] http://www.flyinmiata.com <http://www.flyinmiata.com/> 1-800-FLY-MX5s (orders) 1-970-464-5600 (tech) 2008 FM Open House: August 14-17 ________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of ~Jeff~ Sent: Friday, June 20, 2008 10:59 PM To: [email protected] Subject: Re: MPG up 74% I've wondered about this too ... leading contender so far is a bellmouth exit (like a trumpet), but it might be noisy ? 2008/6/21 Aleksandr Milewski <[EMAIL PROTECTED]>: So what's the equivalent of a NACA duct for exhaust? (low drag exhaust duct) Is it just a NACA duct with the narrow end aft, or something more subtle? -Z
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