X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 20 Dec 2009 02:36:31 -0500 Message-ID: X-Original-Return-Path: Received: from imr-da03.mx.aol.com ([205.188.105.145] verified) by logan.com (CommuniGate Pro SMTP 5.3c3) with ESMTP id 4027765 for lml@lancaironline.net; Fri, 18 Dec 2009 11:47:41 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.188.105.145; envelope-from=Sky2high@aol.com Received: from imo-ma03.mx.aol.com (imo-ma03.mx.aol.com [64.12.78.138]) by imr-da03.mx.aol.com (8.14.1/8.14.1) with ESMTP id nBIGl08v008401 for ; Fri, 18 Dec 2009 11:47:00 -0500 Received: from Sky2high@aol.com by imo-ma03.mx.aol.com (mail_out_v42.5.) id q.be8.64f1eb34 (29672) for ; Fri, 18 Dec 2009 11:46:54 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: X-Original-Date: Fri, 18 Dec 2009 11:48:08 EST Subject: Re: [LML] Re: Prop and Glide considerations X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1261154888" X-Mailer: AOL 9.5 sub 155 X-Spam-Flag:NO X-AOL-SENDER: Sky2high@aol.com -------------------------------1261154888 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Colyn, A still prop only has the drag of the blade whilst the windmilling prop is like a drag disc. Uh, see the Y-axis, where flatter pitch equal greater parasitic drag - the same effect that is used in controlled auto-rotation descent of a helicopter. Scott In a message dated 12/18/2009 9:20:10 A.M. Central Standard Time, colyncase@earthlink.net writes: great post, Scotty. ....but I've never understood the physics of why a windmilling prop has so much more drag than a stationary prop. -------------------------------1261154888 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Colyn,

A still prop only has the drag of the blade whilst the windmilling pr= op is=20 like a drag disc. Uh, see the Y-axis, where flatter pitch equa= l=20 greater parasitic drag - the same effect that is used in=20 controlled auto-rotation descent of a helicopter.

Scott

In a message dated 12/18/2009 9:20:10 A.M. Central Standard Time,=20 colyncase@earthlink.net writes:

great post, Scotty. ....but I've never understood the= physics=20 of why a windmilling prop has so much more drag than a stationary prop.<= /DIV>

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