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Right, Blake,
I noticed the dropped digit in my earlier e mail to you. Also I used the 10700 rpm in Lynnn's example
Good approach to the calculation by the way.
Ed
----- Original Message ----- From: "Blake Lewis" <blake.lewis@gmail.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, June 01, 2007 4:45 PM
Subject: [FlyRotary] Re: PP Ve??? was Re: Intake CFM air flow
It is not wrong I just dropped a digit of the end of the big number.
Here is the corrected numbers:
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) / (10000 rev/min) = 93.41 ci/rev
1300cc / (2.54cm * 2.54cm * 2.54cm)/ci = 79.33 ci volume
93.41ci / 79.33ci = 1.1774 = 117.74 % VE
Blake
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