X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.121] verified) by logan.com (CommuniGate Pro SMTP 5.3.9) with ESMTP id 4492012 for flyrotary@lancaironline.net; Mon, 04 Oct 2010 06:59:02 -0400 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.121; envelope-from=eanderson@carolina.rr.com Return-Path: X-Authority-Analysis: v=1.1 cv=lu/RhtYP0ChAeUxMEPBris12a71TWT5f9yvo3GNwP9w= c=1 sm=0 a=nAj-9e3w_JcA:10 a=rPkcCx1H5rrOSfN0dPC7kw==:17 a=Ia-xEzejAAAA:8 a=arxwEM4EAAAA:8 a=r1ClD_H3AAAA:8 a=adH0npQT1AiH10taaYIA:9 a=f4sMtfVSEuk50G6Oy6EA:7 a=0FMyVaq42CfCskV08DlIWa9b_44A:4 a=wPNLvfGTeEIA:10 a=EzXvWhQp4_cA:10 a=yMhMjlubAAAA:8 a=1oqGTYSLAAAA:8 a=GIOrFVU_IaLu0_Ef8ugA:9 a=W4BaxF3Ij6nTSKq5RBkA:7 a=nWHL6XbbHVSYyM9G6bZsxkMpLFsA:4 a=cvn8laQl214A:10 a=rPkcCx1H5rrOSfN0dPC7kw==:117 X-Cloudmark-Score: 0 X-Originating-IP: 174.110.167.5 Received: from [174.110.167.5] ([174.110.167.5:52124] helo=EdPC) by cdptpa-oedge02.mail.rr.com (envelope-from ) (ecelerity 2.2.3.46 r()) with ESMTP id D6/09-14228-253B9AC4; Mon, 04 Oct 2010 10:58:26 +0000 Message-ID: <4842B8737592461D8B6D0FABBA27C3CC@EdPC> From: "Ed Anderson" To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Re: [FlyRotary] Re: Sam Hodges Prop area Comparison Date: Mon, 4 Oct 2010 06:58:04 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001B_01CB6391.7DFCAC30" 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_001B_01CB6391.7DFCAC30 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Chris, With Sam's original prop, he got around 5000 rpm max static. May have = been as high as 5100 but ranged around 4800-5000 rpm. When He put my = 74x88 Performance Prop on he got as high as 6100 rpm one time but each = time got at least 6000 rpm. Measure your chord at its widest point - mine is 5 1/2", Sam's was = around 8" - not the whole story on a prop, but can be an indication of = whether your prop is close to one end of the spectrum or the other Ed From: Chris and Terria=20 Sent: Sunday, October 03, 2010 9:37 PM To: Rotary motors in aircraft=20 Subject: [FlyRotary] Re: Sam Hodges Prop area Comparison Ed, =20 I have the same Catto prop and mine is marked 76x88. I didn't get more = than 5000 RPM max static either. To be honest, I didn't look at the max = RPM while airborne, I was too busy looking at the temp, and I pulled the = power back as soon as I could. I hope to fly again with the new = radiator in a few weeks, and should be able to get new data. What were = Sam's numbers Max static with the CATTO and with your prop? =20 Thanks, =20 Chris =20 From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On = Behalf Of Ed Anderson Sent: Sunday, October 03, 2010 10:46 AM To: Rotary motors in aircraft Subject: [FlyRotary] Sam Hodges Prop area Comparison =20 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. =20 Ed =20 Edward L. Anderson Anderson Electronic Enterprises LLC 305 Reefton Road Weddington, NC 28104 http://www.andersonee.com http://www.eicommander.com ------=_NextPart_000_001B_01CB6391.7DFCAC30 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi Chris,

With Sam's original prop, he got around 5000 rpm = max=20 static. May have been as high as 5100 but ranged around 4800-5000=20 rpm. When He put my 74x88 Performance Prop on he got as high as = 6100 rpm=20 one time but each time got at least 6000 rpm.

Measure your chord at its widest point - mine is = 5 1/2",=20 Sam's was around 8" - not the whole story on a prop, but can be an = indication of=20 whether your prop is close to one end of the spectrum or the = other

From: Chris and Terria

Sent: Sunday, October 03, 2010 9:37 PM

To: Rotary motors in = aircraft

Subject: [FlyRotary] Re: Sam Hodges Prop area=20 Comparison

Ed,

I=20 have the same Catto prop and mine is marked 76x88. I didn=92t get = more than=20 5000 RPM max static either. To be honest, I didn=92t look at the = max RPM=20 while airborne, I was too busy looking at the temp, and I pulled the = power back=20 as soon as I could. I hope to fly again with the new radiator in a = few=20 weeks, and should be able to get new data. What were Sam=92s = numbers Max=20 static with the CATTO and with your prop?

Thanks,

Chris

From: Rotary = motors in=20 aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Ed=20 Anderson
Sent: Sunday, October 03, 2010 10:46 AM
To: = Rotary=20 motors in aircraft
Subject: [FlyRotary] Sam Hodges Prop area=20 Comparison

Just doing a=20 rough back of the envelope calculation comparing Sam Hodges prop = (8" cord)=20 to my prop (5 1/2" cord) and assuming the two props blade profiles were = similar,=20 Sam's prop would have approx 45% more prop area trying to push the air = back than=20 my prop. Small wonder his engine was groaning trying to spin it up = to 6000=20 rpm.

Edward L.=20 Anderson
Anderson Electronic Enterprises LLC
305 Reefton=20 Road
Weddington, NC 28104
http://www.andersonee.com
http://www.eicommander.com=

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