X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.123] verified) by logan.com (CommuniGate Pro SMTP 5.3.9) with ESMTP id 4491265 for flyrotary@lancaironline.net; Sun, 03 Oct 2010 10:46:39 -0400 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.123; envelope-from=eanderson@carolina.rr.com Return-Path: X-Authority-Analysis: v=1.1 cv=Kw91eHCEomHy3ia4iliyYwPDdG6gmL57yW58Q85fxVk= c=1 sm=0 a=rPkcCx1H5rrOSfN0dPC7kw==:17 a=arxwEM4EAAAA:8 a=r1ClD_H3AAAA:8 a=_KxYC6gaQR5dl9y1QzYA:9 a=W_XOBw5045ktIopKMECzJXdHDgMA:4 a=pILNOxqGKmIA:10 a=wp-p4Dr6P17IhIAdQAsA:9 a=NcTVlfNO7PNRshNekuYA:7 a=I5HyPrjaYc_SOO3pmkhz4O0pr9MA:4 a=rPkcCx1H5rrOSfN0dPC7kw==:117 X-Cloudmark-Score: 0 X-Originating-IP: 174.110.167.5 Received: from [174.110.167.5] ([174.110.167.5:51261] helo=EdPC) by cdptpa-oedge04.mail.rr.com (envelope-from ) (ecelerity 2.2.2.39 r()) with ESMTP id FA/B8-28816-B2798AC4; Sun, 03 Oct 2010 14:46:03 +0000 Message-ID: <0759197ADC2E4507BE0B619250AF1A63@EdPC> From: "Ed Anderson" To: "Rotary motors in aircraft" Subject: Sam Hodges Prop area Comparison Date: Sun, 3 Oct 2010 10:45:44 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0026_01CB62E8.21891DC0" 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_0026_01CB62E8.21891DC0 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Just doing a rough back of the envelope calculation comparing Sam = Hodges prop (8" cord) to my prop (5 1/2" cord) and assuming the two = props blade profiles were similar, Sam's prop would have approx 45% more = prop area trying to push the air back than my prop. Small wonder his = engine was groaning trying to spin it up to 6000 rpm. Ed Edward L. Anderson Anderson Electronic Enterprises LLC 305 Reefton Road Weddington, NC 28104 http://www.andersonee.com http://www.eicommander.com ------=_NextPart_000_0026_01CB62E8.21891DC0 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
Just doing a rough back of the envelope = calculation=20 comparing  Sam Hodges prop (8" cord) to my prop (5 1/2" cord) and = assuming=20 the two props blade profiles were similar, Sam's prop would have approx = 45% more=20 prop area trying to push the air back than my prop.  Small wonder = his=20 engine was groaning trying to spin it up to 6000 rpm.
 
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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