Return-Path: Received: from fed1mtao06.cox.net ([68.6.19.125] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2976075 for flyrotary@lancaironline.net; Wed, 04 Feb 2004 21:05:33 -0500 Received: from BigAl ([68.107.116.221]) by fed1mtao06.cox.net (InterMail vM.5.01.06.05 201-253-122-130-105-20030824) with ESMTP id <20040205020532.DKPH2425.fed1mtao06.cox.net@BigAl> for ; Wed, 4 Feb 2004 21:05:32 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: air flow, induction air scoop Date: Wed, 4 Feb 2004 18:05:45 -0800 Message-ID: <002901c3eb8c$911ab020$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002A_01C3EB49.82F77020" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4024 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_002A_01C3EB49.82F77020 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Subject: [FlyRotary] Re: air flow, induction air scoop I don't understand how a 13B can flow 277.77 cu ft/min at 6000rpm, while a 20B flows 275 cu ft. min.(Al's numbers), unless the 275 cu ft figure is for 4000rpm instead of 6000 rpm. Using Ed's formula, I get 416.67 cu ft/min at 6000rpm, or 31.66 lbs/minute. Which number is correct? Mark S. Mark; I guess you didn't read the intervening postings where I admitted I had made a mistake. Apparently I computed for 2 rotors instead of three. Al ------=_NextPart_000_002A_01C3EB49.82F77020 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Subject: [FlyRotary] Re: air flow, induction air scoop

 

I don't understand how a 13B can flow 277.77 = cu ft/min at 6000rpm, while a 20B flows 275 cu ft. min.(Al's numbers), unless the = 275 cu ft figure is for 4000rpm instead of 6000 rpm.  Using Ed's formula, = I get 416.67 cu ft/min at 6000rpm, or 31.66 lbs/minute.  Which number is correct?
 
Mark S.


Mark;

I guess you didn’t read the intervening postings where I admitted I had made a mistake.  = Apparently I computed for 2 rotors instead of three.

 

Al

 

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