X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ms-smtp-01.southeast.rr.com ([24.25.9.100] verified) by logan.com (CommuniGate Pro SMTP 5.1c.3) with ESMTP id 1375457 for flyrotary@lancaironline.net; Mon, 11 Sep 2006 23:38:48 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.100; envelope-from=echristley@nc.rr.com Received: from [192.168.0.248] (cpe-066-057-036-199.nc.res.rr.com [66.57.36.199]) by ms-smtp-01.southeast.rr.com (8.13.6/8.13.6) with ESMTP id k8C3c7Jd022031 for ; Mon, 11 Sep 2006 23:38:08 -0400 (EDT) Message-ID: <45062ADB.2060904@nc.rr.com> Date: Mon, 11 Sep 2006 23:34:51 -0400 From: Ernest Christley User-Agent: Thunderbird 1.5.0.5 (X11/20060808) MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: It runs!..FOUND IT! References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: Symantec AntiVirus Scan Engine It was just irritating me that I couldn't find it, but I finally did (sorry about the mm stuff): micasue2... @yahoo.com wrote: > I want to run my engine (ford v-6) this summer for various tests and I > want some sort of prop. What do most people use for props when testing > at this stage? I was thinking of glueing together 2 or 3 fir 2x6's or > using a laminate beam (leftovers from a remodeling project) and carving > some airfoil shape. Seems like it should work if it is balanced. Of > course I don't want to sling a blade down the taxiway or through my > neighbors hangar door. Anybody offer some suggestions? Thanks. from Michel colomban (cricri, MC100, MCR01 designer) A square wood beam, aera= a*a diam=15*a You find the power with this formula: P=0.0532 * (diam/450)^5 * (rpm/1000)^3 with diam in mm rpm in revolution / mn or diam=((P/0.0532) * 10^9 * 450^5 / rpm^3 ))^0.2 a=diam/15 I you want check 180hp @ 3800rpm diam = 1026mm a = 68.4mm