Thanks, Al, for the clarification –
yes. Absolute Manifold pressure = Ambient pressure + Boost Pressure.
I see what led to the confusion, I referred to the absolute manifold
pressure as total boost pressure when I was thinking total pressure
of which boost pressure is only one component.
Bob, I Must need more coffee in the
morning – oops, that excuse won’t work - as I sent that e mail in
the afternoon {:>).
Appreciate you catching my error.
Ed
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
On Behalf Of Al Gietzen
Sent: Saturday, January 24, 2009
12:53 AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: HP was :
Mark's BBQ Run / 20B numbers
I’m
sure he meant 60” MAP; 30” boost.
Al
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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