Return-Path: Received: from sccrmhc13.comcast.net ([204.127.202.64] verified) by logan.com (CommuniGate Pro SMTP 4.2b1) with ESMTP id 3151704 for flyrotary@lancaironline.net; Wed, 07 Apr 2004 20:54:38 -0400 Received: from 204.127.205.143 ([204.127.205.143]) by comcast.net (sccrmhc13) with SMTP id <20040408005432016003dlrie>; Thu, 8 Apr 2004 00:54:37 +0000 Received: from [68.51.45.250] by 204.127.205.143; Thu, 08 Apr 2004 00:54:32 +0000 From: kenpowell@comcast.net To: "Rotary motors in aircraft" Subject: Help Rusty pick a prop Date: Thu, 08 Apr 2004 00:54:32 +0000 Message-Id: <040820040054.11200.4074A2C7000D135900002BC02200763704FF93939A88908F919A@comcast.net> X-Mailer: AT&T Message Center Version 1 (Mar 22 2004) X-Authenticated-Sender: a2VucG93ZWxsQGNvbWNhc3QubmV0 Rusty, I don't have Excell on this computer so I can't run the John Roncz prop program that I sent out last week. However, I seem to remember that we won't be able to run over about 6600 RPM with a 2.17 redrive without approaching transonic tip speeds (over 900 FPS) on the prop. Tracy never said so, but I suspected that this was one of the limits on his past setup. Just a thought, and without running the numbers can't be sure. Maybe someone will run the numbers with the Roncz program and post the results (and take the guesswork out of the equation). Ken Powell