X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ms-smtp-04.southeast.rr.com ([24.25.9.103] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2079257 for flyrotary@lancaironline.net; Fri, 01 Jun 2007 17:20:31 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.103; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-103-061.carolina.res.rr.com [24.74.103.61]) by ms-smtp-04.southeast.rr.com (8.13.6/8.13.6) with SMTP id l51LJGfE027447 for ; Fri, 1 Jun 2007 17:19:17 -0400 (EDT) Message-ID: <003a01c7a492$8b7639b0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: PP Ve??? was Re: Intake CFM air flow Date: Fri, 1 Jun 2007 17:19:31 -0400 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 X-Virus-Scanned: Symantec AntiVirus Scan Engine Ok, looks like all the bugs are out of the math and it looks like our PP 12A gets around 120%Ve. That corresponds to a number I had hear before, but nice to have an example to support it. Thanks Lynn, Blake and Bob Ed ----- Original Message ----- From: "Blake Lewis" To: "Rotary motors in aircraft" Sent: Friday, June 01, 2007 4:53 PM Subject: [FlyRotary] Re: PP Ve??? was Re: Intake CFM air flow > 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 > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html