X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost01.isp.att.net ([207.115.11.51] verified) by logan.com (CommuniGate Pro SMTP 5.2c4) with ESMTP id 2632679 for flyrotary@lancaironline.net; Sat, 05 Jan 2008 21:47:03 -0500 Received-SPF: pass receiver=logan.com; client-ip=207.115.11.51; envelope-from=ceengland@bellsouth.net Received: from [216.76.224.31] (host-216-76-224-31.jan.bellsouth.net[216.76.224.31]) by isp.att.net (frfwmhc01) with ESMTP id <20080106024621H0100n0683e>; Sun, 6 Jan 2008 02:46:22 +0000 X-Originating-IP: [216.76.224.31] Message-ID: <478040FD.2010102@bellsouth.net> Date: Sat, 05 Jan 2008 20:46:21 -0600 From: Charlie England User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.9) Gecko/20071030 SeaMonkey/1.1.6 MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Magic Vapor Cycle Engines References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Hi Thomas, If I understand your question, I think the assumptions might be reversed. My understanding is that any dyno, whether water brake, prop-loaded (air brake), etc. that uses the scale/lever technique is actually measuring raw engine torque. If you want to measure the losses in the gearbox and/or prop, you would measure thrust, convert to HP & compare to HP calculated from torque/rpm. If you are proposing measuring the output of a generator, you would be ignoring the losses in the inefficiency of the generator. That would be the equivalent of measuring only thrust in the previous example. If I'm in error, hopefully someone more knowledgeable will jump in. Charlie Thomas Jakits wrote: > Ooh yes! Pleease! > thjakits@gmail.com > > Thank you very much! > > Question to a possible "DIY/cheapo"-dyno: > I saw various plans/models where one bolts up the engine/PSRU/club-prop > and measures power via rpm x momentum (via bathroomscale/lever). This > gives me the overall hp - incl any losses from the PSRU and > inefficiencies fomr the prop. > What a about a pure engine-dyno? Drive a waterpump/generator (where do I > get a cheap 300kw generator??) ??? > > Thomas J. > > > > On 1/5/08, *Lehanover@aol.com * > > wrote: > > In a message dated 1/4/2008 9:06:12 P.M. Eastern Standard Time, > rotary.thjakits@gmail.com writes: > > Also one would need at least a simple flowbench, but there Lynn > or Bill should have something up their sleeves ?:))? > > Thomas J. > > Would you like my plans for the flow bench? > > Lynn E. Hanover > > > > ------------------------------------------------------------------------ > Start the year off right. Easy ways to stay in shape > > in the new year. > > > > ------------------------------------------------------------------------ > > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.516 / Virus Database: 269.17.13/1210 - Release Date: 1/5/2008 11:46 AM