Mailing List flyrotary@lancaironline.net Message #44901
From: Bob Darrah <rdarrah@austin.rr.com>
Subject: Re: [FlyRotary] Re: HP was : Mark's BBQ Run / 20B numbers
Date: Fri, 23 Jan 2009 20:58:20 -0600
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Hay, Ed, I always thought 15 Psi boost was about only 30" Hg of boost-atmospheric pressure (about 15 Psi) equals only (about ) 30" Hg. Where did I go wrong?
----- Original Message -----
Sent: Friday, January 23, 2009 2:10 PM
Subject: [FlyRotary] Re: HP was : Mark's BBQ Run / 20B numbers

Should be a fire belching dragon of an engine at over 15psi, Greg.

 

 15 Psi boost would be roughly 60” Hg of boost which at an A/F ratio of 12 (assume you would run it a bit rich at those boost levels) would give at 6000 rpm approx 550 HP burning 51 gph (more power  at high rpm and boost naturally)  and producing a total of  25000 BTU/Min of heat to be dumped through the radiator and oil cooler.  Boy, you will produce more heat energy that gets dumped through your oil cooler (8484 BTU/Min) than my total (coolant and oil heat) entire engine puts out.  Hope you have big radiators and oil cooler {:>).

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