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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-2077338@logan.com>
Subject: Re: [FlyRotary] Intake CFM air flow
Date: Thu, 31 May 2007 19:22:24 -0400
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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


----- Original Message ----- 
From: "Bill Bradburry" <bbradburry@allvantage.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Thursday, May 31, 2007 4:16 PM
Subject: [FlyRotary] Intake CFM air flow


> Does anybody know what the CFM intake air flow is on the rotary?  I am 
> thinking about the size of air filter I would need.  For instance, what 
> size K&N filter would I use?  I would like to provide ram air thru the 
> filter.
>
> I was considering the conical type filter, but it looks like the size of 
> it may be a show stopper.  I am pretty limited in the space available for 
> a filter and do not want to make too convoluted a path to the throttle 
> body.  What is the best guess on the number of square inches of filter 
> required?
>
> Any help would be appreciated.
>
> Thanks,
> Bill B
>
> --
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