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Date: Fri, 1 Jun 2007 15:02:19 -0600
From: Bob White <rlwhite@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: PP Ve??? was Re: Intake CFM air flow
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HI Blake,

Ah! It's even higher.  I should have looked more closely at the
formulae.  I saw you were dividing 1300 by something then didn't notice
the result was used in the denominator of the next formula.  Sorry
about that. :)

Bob W.

On Fri, 1 Jun 2007 15:53:55 -0500
"Blake Lewis" <blake.lewis@gmail.com> wrote:

> Bob,
> You corrected the wrong way. And I had 10000 instead of 10700 rpm.
> 
> 12A  Pports can do 310 HP at 10,700 RPM at .667
> 
> If the .667 is BSFC then start with that
> 
> Density of air at sea level 15C = .0765 lbs/cf air/fuel = 12
> 
> .667 bsfc x 310hp is 206.77 lbs/hr fuel
> 
> 206.77lbs x 12 = 2481.24 lbs/hr air
> 
> 2481.24 lbs/hr  /  60min/hr = 41.354 lbs/min
> 
> (41.354 lbs/min)  / (.0765 lbs/cf) * (1728 ci/cf) = 93411 ci /min
> 
> (934113ci/min) / (10700 rev/min) = 87.30 ci/rev
> 
> 1200cc / (2.54cm * 2.54cm * 2.54cm)/ci = 73.22 ci volume
> 
> 87.30 ci/rev / 73.22 ci/rev = 1.192 =119% VE
> 
> Blake
> 
> --
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