X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.120] verified) by logan.com (CommuniGate Pro SMTP 5.3.9) with ESMTP id 4499638 for flyrotary@lancaironline.net; Sat, 09 Oct 2010 13:17:40 -0400 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.120; envelope-from=eanderson@carolina.rr.com Return-Path: X-Authority-Analysis: v=1.1 cv=QSZclhxgDhhmevwBV2YEn103LiRbjsuAJdvYsZfX8C8= c=1 sm=0 a=rPkcCx1H5rrOSfN0dPC7kw==:17 a=arxwEM4EAAAA:8 a=r1ClD_H3AAAA:8 a=x7gtPVkxuNq6HzTT-IEA:9 a=8u9YqjhytRiX9N1o66ZFXpjebvoA:4 a=pILNOxqGKmIA:10 a=E93lBu2AAAAA:8 a=Rbgg5_kLmMQDimsxDHwA:9 a=KP8tpcPHNfpfogNXVI0A:7 a=_A9GE812UpLYUoWEv1fDLUx0zlIA:4 a=hO30gm18fF0A:10 a=FOUTPhXFUAcA:10 a=zgjei8Deq7QA:10 a=NWVoK91CQyQA:10 a=rPkcCx1H5rrOSfN0dPC7kw==:117 X-Cloudmark-Score: 0 X-Originating-IP: 174.110.167.5 Received: from [174.110.167.5] ([174.110.167.5:63039] helo=EdPC) by cdptpa-oedge04.mail.rr.com (envelope-from ) (ecelerity 2.2.2.39 r()) with ESMTP id DA/03-23684-F83A0BC4; Sat, 09 Oct 2010 17:17:04 +0000 Message-ID: <7A769641E832434F938AE0871DF4ECD1@EdPC> From: "Ed Anderson" To: "Rotary motors in aircraft" Subject: Effective Prop Pitch Calculations Date: Sat, 9 Oct 2010 13:16:49 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0003_01CB67B4.3B47B340" X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8117.416 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8117.416 This is a multi-part message in MIME format. ------=_NextPart_000_0003_01CB67B4.3B47B340 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable I used the equation that Lipps mentions in the article in CONTACT! to = Calculate "Effective Pitch" of my 74x88 prop. His equation (with some = clarifying annotations) is=20 Effective Pitch ( % ) =3D TAS (mph) *1056/RPM(Props' RPM not engine) EF =3D 168*1056/2105 =3D 84.27 effective pitch=20 Since my Props pitch is suppose to be 88" could this mean I have a bit = of "Slippage"? Actually, I was impressed that the calculation came out = as close as it did - within 4% of its 88" of pitch. =20 Thanks Pat Ed Edward L. Anderson Anderson Electronic Enterprises LLC 305 Reefton Road Weddington, NC 28104 http://www.andersonee.com http://www.eicommander.com ------=_NextPart_000_0003_01CB67B4.3B47B340 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
I used the equation that Lipps mentions in the = article in=20 CONTACT! to Calculate "Effective Pitch" of my 74x88 prop.  His = equation=20 (with some clarifying annotations) is
 
Effective Pitch ( % ) =3D TAS (mph) = *1056/RPM(Props' RPM=20 not engine)
 
EF =3D 168*1056/2105 =3D 84.27 effective pitch =
 
Since my Props pitch is suppose to be 88" could = this mean=20 I have a bit of "Slippage"?  Actually, I was impressed that the = calculation=20 came out as close as it did - within 4% of its 88" of pitch.  =
 
Thanks Pat
 
Ed
 
 
Edward L. Anderson
Anderson Electronic = Enterprises=20 LLC
305 Reefton Road
Weddington, NC 28104
http://www.andersonee.com
http://www.eicommander.com
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