X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 11 May 2006 20:48:17 -0400 Message-ID: X-Original-Return-Path: Received: from smtp109.sbc.mail.mud.yahoo.com ([68.142.198.208] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with SMTP id 1101535 for lml@lancaironline.net; Thu, 11 May 2006 20:34:09 -0400 Received-SPF: none receiver=logan.com; client-ip=68.142.198.208; envelope-from=elippse@sbcglobal.net Received: (qmail 46366 invoked from network); 12 May 2006 00:33:25 -0000 Received: from unknown (HELO Computerroom) (elippse@sbcglobal.net@75.15.142.102 with login) by smtp109.sbc.mail.mud.yahoo.com with SMTP; 12 May 2006 00:33:25 -0000 X-Original-Message-ID: <000501c6755b$b0a1b820$668e0f4b@Computerroom> From: "Paul Lipps" X-Original-To: "Marv Kaye" Subject: prop diameter X-Original-Date: Thu, 11 May 2006 17:33:25 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0002_01C67521.02422E20" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2869 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2869 This is a multi-part message in MIME format. ------=_NextPart_000_0002_01C67521.02422E20 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable The only reason some multi-blade props are less efficient is that they = have a klunky, un-aerodynamic shape in the hub region, so more blades, = more draggy shapes being pulled through the air! Just because that = klunky shape is rotating doesn't take away its drag! Put a nice, = streamlined, glove fairing around those blade roots, with proper helical = twist angle, and you'll have a great prop. A four-blade will you give = great takeoff and climb. How many blades on the C130J? 6! How many on = the fan of a fanjet? 18-24. Note that those fan blades maintain the = correct shape all the way to the hub, and are at the correct, very = steep, helix angle! ------=_NextPart_000_0002_01C67521.02422E20 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
The only reason some = multi-blade=20 props are less efficient is that they have a klunky, un-aerodynamic = shape in the=20 hub region, so more blades, more draggy shapes being pulled through the = air!=20 Just because that klunky shape is rotating doesn't take away its = drag! Put=20 a nice, streamlined, glove fairing around those blade roots, with = proper=20 helical twist angle, and you'll have a great prop. A four-blade will you = give=20 great takeoff and climb. How many blades on the C130J? 6! How many = on the=20 fan of a fanjet? 18-24. Note that those fan blades maintain the = correct=20 shape all the way to the hub, and are at the correct, very steep, helix=20 angle!
------=_NextPart_000_0002_01C67521.02422E20--