X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imr-da01.mx.aol.com ([205.188.105.143] verified) by logan.com (CommuniGate Pro SMTP 5.3.9) with ESMTP id 4498640 for flyrotary@lancaironline.net; Fri, 08 Oct 2010 13:55:34 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.105.143; envelope-from=Lehanover@aol.com Received: from imo-da04.mx.aol.com (imo-da04.mx.aol.com [205.188.169.202]) by imr-da01.mx.aol.com (8.14.1/8.14.1) with ESMTP id o98Hsk2Y023346 for ; Fri, 8 Oct 2010 13:54:46 -0400 Received: from Lehanover@aol.com by imo-da04.mx.aol.com (mail_out_v42.9.) id q.f74.3767f92 (45478) for ; Fri, 8 Oct 2010 13:54:40 -0400 (EDT) Received: from magic-d19.mail.aol.com (magic-d19.mail.aol.com [172.19.155.135]) by cia-mc06.mx.aol.com (v129.5) with ESMTP id MAILCIAMC067-b1a64caf5ae032c; Fri, 08 Oct 2010 13:54:40 -0400 From: Lehanover@aol.com Message-ID: <17f6e4.1669e9e.39e0b4e0@aol.com> Date: Fri, 8 Oct 2010 13:54:40 EDT Subject: Re: [FlyRotary] Prop Chord vs RPM To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_17f6e4.1669e9e.39e0b4e0_boundary" X-Mailer: 9.0 Security Edition for Windows sub 5381 X-AOL-IP: 173.88.9.178 X-Spam-Flag:NO X-AOL-SENDER: Lehanover@aol.com --part1_17f6e4.1669e9e.39e0b4e0_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 10/8/2010 11:48:42 A.M. Eastern Daylight Time, eanderson@carolina.rr.com writes: I did a plot of chord of the three props mentioned recently. The props were of 74-76 inches in dia and made by Catto (2) and Performance Prop (1). Note my Performance Prop was shorter only 74 compared to Sams and Dennis Catto Props. When mine was 76" in dia my static was lower than 6000 which would have all three props pretty much on a straight line. I don't know if one could make much of a linear relationship between prop chord and rpm based on just three data points, but thought some might find it interesting. And now how about the thrust for each diameter and blade chord and pitch. What is the most effective prop for the most common diameters? Lynn E. Hanover --part1_17f6e4.1669e9e.39e0b4e0_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 10/8/2010 11:48:42 A.M. Eastern Daylight Time,=20 eanderson@carolina.rr.com writes:

I did a plot of chord of the three props mention= ed=20 recently. The props were of 74-76 inches in dia and made by Catto= (2)=20 and Performance Prop (1). Note my Performance Prop was shorter onl= y 74=20 compared to Sams and Dennis Catto Props. When mine was 76" in dia= my=20 static was lower than 6000 which would have all three props pretty much= on a=20 straight line. I don't know if one could make much of a linear=20 relationship between prop chord and rpm based on just three data points,= but=20 thought some might find it interesting.

And now how about the thrust for each diameter and blade chord and pi= tch.=20 What is the most effective prop for the most common diameters?

Lynn E. Hanover

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