Return-Path: Received: from atlantic.mail.pas.earthlink.net ([207.217.120.179] verified) by logan.com (CommuniGate Pro SMTP 4.2) with ESMTP id 354951 for flyrotary@lancaironline.net; Fri, 06 Aug 2004 13:34:38 -0400 Received-SPF: none receiver=logan.com; client-ip=207.217.120.179; envelope-from=jmpcrftr@teleport.com Received: from ip216-26-75-221.dsl.du.teleport.com ([216.26.75.221] helo=michaelm1.teleport.com) by atlantic.mail.pas.earthlink.net with esmtp (Exim 3.33 #1) id 1Bt8bY-0005Ws-00 for flyrotary@lancaironline.net; Fri, 06 Aug 2004 10:34:08 -0700 Message-Id: <6.1.1.1.0.20040806102202.031c6ec0@mail.teleport.com> X-Sender: jmpcrftr@mail.teleport.com (Unverified) X-Mailer: QUALCOMM Windows Eudora Version 6.1.1.1 Date: Fri, 06 Aug 2004 10:31:54 -0700 To: "Rotary motors in aircraft" From: Michael McGee Subject: Re: [FlyRotary] elippse props In-Reply-To: References: Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="=====================_15326109==.ALT" --=====================_15326109==.ALT Content-Type: text/plain; charset="us-ascii"; format=flowed The new Whirl Wind props are approaching this blade shape. The 200RV and the 151 models are a little like the Elippse but not quite as radically shaped. They aren't certified as far as I know. I would bet that most of the prop manufacturers don't build props like this because it looks so different. Most prop makers just copy blade shapes from others that work. After reading that article I'm wanting to try carving a prop like this for my RV-4 just to play with it and see what it does to the performance. Lipps is only running 125 hp in that Lancair so trying props up the hp spectrum would be a good idea. MGM Mike McGee, RV-4 N996RV, O320-E2G, Hillsboro, OR 13B in gestation mode, RD-1C, EC-2 At 10:06 2004-08-06, you wrote: >I just read the contact article about elippse props. his design seems to >make much sense and his aerospace experience backs that up. my question >is why haven't the major prop makers taken this route? the science behind >his reasoning seems to have been all known since laminar flow was discovered. >Kevin Lane Portland, OR >e-mail-> n3773@comcast.net >web-> http://home.comcast.net/~n3773 >(browse w/ internet explorer) --=====================_15326109==.ALT Content-Type: text/html; charset="us-ascii" The new Whirl Wind props are approaching this blade shape. The 200RV and the 151 models are a little like the Elippse but not quite as radically shaped. They aren't certified as far as I know. I would bet that most of the prop manufacturers don't build props like this because it looks so different. Most prop makers just copy blade shapes from others that work. After reading that article I'm wanting to try carving a prop like this for my RV-4 just to play with it and see what it does to the performance. Lipps is only running 125 hp in that Lancair so trying props up the hp spectrum would be a good idea.

MGM
Mike McGee, RV-4 N996RV, O320-E2G, Hillsboro, OR
13B in gestation mode, RD-1C, EC-2

At 10:06 2004-08-06, you wrote:

I just read the contact article about elippse props. his design seems to make much sense and his aerospace experience backs that up. my question is why haven't the major prop makers taken this route? the science behind his reasoning seems to have been all known since laminar flow was discovered.
Kevin Lane Portland, OR
e-mail-> n3773@comcast.net
web-> http://home.comcast.net/~n3773
(browse w/ internet explorer)

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