X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imf04aec.mail.bellsouth.net ([205.152.59.52] verified) by logan.com (CommuniGate Pro SMTP 5.0.4) with ESMTP id 890532 for flyrotary@lancaironline.net; Tue, 20 Dec 2005 18:42:59 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.52; envelope-from=atlasyts@bellsouth.net Received: from ibm62aec.bellsouth.net ([68.213.226.209]) by imf20aec.mail.bellsouth.net with ESMTP id <20051219190745.UBQF27501.imf20aec.mail.bellsouth.net@ibm62aec.bellsouth.net> for ; Mon, 19 Dec 2005 14:07:45 -0500 Received: from [192.168.0.103] (really [68.213.226.209]) by ibm62aec.bellsouth.net with ESMTP id <20051219190744.IMWR28056.ibm62aec.bellsouth.net@[192.168.0.103]> for ; Mon, 19 Dec 2005 14:07:44 -0500 Mime-Version: 1.0 (Apple Message framework v746.2) In-Reply-To: References: Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Message-Id: Content-Transfer-Encoding: 7bit From: Buly Subject: Re: [FlyRotary] Re: Props Date: Mon, 19 Dec 2005 14:07:43 -0500 To: "Rotary motors in aircraft" X-Mailer: Apple Mail (2.746.2) Thanks Perry. This makes me feel much better. Looks like the formulas given to me were not good. Buly On Dec 19, 2005, at 2:00 PM, Perry Casson wrote: > I think your math is off a bit - Here's a online calculator http:// > www.hoverhawk.com/propspd.html > > I think 6900 puts a 72" prop close to mach 0.9 but I've never ran > mine above 6500 > > Perry Casson > > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ Buly atlasyts@bellsouth.net