X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-qy0-f173.google.com ([209.85.216.173] verified) by logan.com (CommuniGate Pro SMTP 5.3.9) with ESMTP id 4489720 for flyrotary@lancaironline.net; Fri, 01 Oct 2010 18:48:59 -0400 Received-SPF: none receiver=logan.com; client-ip=209.85.216.173; envelope-from=andrew@martinag.com.au Received: by qyk34 with SMTP id 34so4332531qyk.4 for ; Fri, 01 Oct 2010 15:48:23 -0700 (PDT) Received: by 10.229.246.141 with SMTP id ly13mr4324425qcb.80.1285973299643; Fri, 01 Oct 2010 15:48:19 -0700 (PDT) Return-Path: Received: from [192.168.88.250] ([203.42.105.31]) by mx.google.com with ESMTPS id q8sm1833049qcs.0.2010.10.01.15.48.16 (version=TLSv1/SSLv3 cipher=RC4-MD5); Fri, 01 Oct 2010 15:48:18 -0700 (PDT) Subject: Re: [FlyRotary] Re: simple dyno References: From: Andrew Martin Content-Type: text/plain; charset=us-ascii X-Mailer: iPhone Mail (8B117) In-Reply-To: Message-Id: Date: Sat, 2 Oct 2010 06:48:50 +0800 To: Rotary motors in aircraft Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (iPhone Mail 8B117) X section is 1/15 diameter ( length of bar), yes the spreadsheet does all th= e calc's in mm, told me to make a bar 1350x90mm. The spreadsheet itself is copywrite so if you don't want to spend the $125.0= 0 you'll have to decipher the formulae yourself The 5 and 3 in that formulae are power of. It did not copy through properly w= hen I posted it. I got the program for the prop design and aircraft performance calculations,= this wood bar dyno is more of a curio as I needed a load on the engine for w= hen I start it so thought I may as well have a load that gives a calculated r= esult. Andrew On 02/10/2010, at 2:27 AM, Ernest Christley wrote: > Andrew Martin wrote: >> Power in HP =3D 0.0532 (diameter/450)5 (RPM/1000)3 >=20 > Can we assume that diameter is measured in mm? >=20 > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List= .html