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Thanks Bob and Ed.
I would appreciate the pictures, Bob.
Ed, I expected a much higher flow. I thought that it would be in the neighborhood of 600-800 CFM! I guess I have been spending too much time reading the carburetor adds for V8s....
I think that the 278 CFM would translate to an air velocity of about 48.25 MPH going through my 3 inch throttle body. That seems like a gentle breeze! Maybe I am spending too much time trying to remove restrictions to the air flow in the inlet?? :<)
Bill B
Subject:
Re: [FlyRotary] Intake CFM air flow
From:
Bob White <rlwhite@comcast.net>
Date:
Thu, 31 May 2007 18:48:02 -0600
Hi Bill,
I built a can around it out of aluminum. The can clamped on at the
same place as the filter and it was about 6" dia or maybe a little
larger. I then made a fiberglass air inlet that sealed to the can with
a strip of red silicon engine baffle. I was hoping to generate some
ram air pressure, but didn't get a chance to measure it to see how good
it worked. I'll take some pictures next time I get to the airport.
Bob W.
Subject:
Re: [FlyRotary] Intake CFM air flow
From:
"Ed Anderson" <eanderson@carolina.rr.com>
Date:
Thu, 31 May 2007 19:22:24 -0400
Bill, at 6000 rpm the airflow is 277 CFM assuming 100% Ve. Here is a formula
for calculating airflow for the rotary.
Air Flow (CFM) = (40 cubic inches per face)*2(number rotors) * 3(faces per rotor)*rpm of rotors(= E shaft rpm/3) /1728 (conversion to CF) = 40*2*3 *(6000/3)/1728 = 240*2000/1728 = 277.77 CFM
Or simplifying Air Flow (CFM) = 80*RPM/1728 = 277.77 CFM air flow at 6000 rpm for a 2 rotor.
Ed
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