Return-Path: Received: from relay04.roc.ny.frontiernet.net ([66.133.131.37] verified) by logan.com (CommuniGate Pro SMTP 4.2b1) with ESMTP id 3152651 for flyrotary@lancaironline.net; Thu, 08 Apr 2004 09:53:07 -0400 Received: (qmail 29943 invoked from network); 8 Apr 2004 13:52:37 -0000 Received: from 65-73-215-188.bras01.cok.tn.frontiernet.net (HELO frontiernet.net) ([65.73.215.188]) (envelope-sender ) by relay04.roc.ny.frontiernet.net (FrontierMTA 2.3.18) with SMTP for ; 8 Apr 2004 13:52:37 -0000 Message-ID: <4075599A.A6C96EF7@frontiernet.net> Date: Thu, 08 Apr 2004 08:54:34 -0500 From: Jim Sower X-Mailer: Mozilla 4.77 [en] (Win98; U) X-Accept-Language: en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Help Rusty pick a prop References: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit What is this Roncz prop program and where do I get a copy? I knew he designed the props on the Pond racer, but I hadn't heard that he'd "published" anything. I'm very interested .... Jim S. kenpowell@comcast.net wrote: > 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 > > >> Homepage: http://www.flyrotary.com/ > >> Archive: http://lancaironline.net/lists/flyrotary/List.html -- Jim Sower ... Destiny's Plaything Crossville, TN; Chapter 5 Long-EZ N83RT, Velocity N4095T