X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 27 Jan 2006 00:47:39 -0500 Message-ID: X-Original-Return-Path: Received: from mai.purplehat.net ([66.103.244.5] verified) by logan.com (CommuniGate Pro SMTP 5.0.7f) with ESMTPS id 954619 for lml@lancaironline.net; Thu, 26 Jan 2006 10:28:41 -0500 Received-SPF: none receiver=logan.com; client-ip=66.103.244.5; envelope-from=lorn@dynacomm.ws Received: from adsl-69-208-116-71.dsl.sfldmi.ameritech.net ([69.208.116.71] helo=[10.0.1.202]) by mai.purplehat.net with esmtpa (Exim 4.52) id 1F292N-0007uq-7d; Thu, 26 Jan 2006 10:27:51 -0500 Mime-Version: 1.0 (Apple Message framework v746.2) Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed X-Original-Message-Id: <5AB9D94C-F6A2-4744-A02D-2AEB332705B6@dynacomm.ws> X-Original-Cc: "Paul Lipps" Content-Transfer-Encoding: 7bit From: Lorn H Olsen Subject: Re: Ram power X-Original-Date: Thu, 26 Jan 2006 10:27:50 -0500 X-Original-To: List Lancair X-Mailer: Apple Mail (2.746.2) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - mai.purplehat.net X-AntiAbuse: Original Domain - lancaironline.net X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - dynacomm.ws X-Source: X-Source-Args: X-Source-Dir: This is only true if you are running at (in my O-320) 2,700 rpm. I do about 75% power at 6,500 at full throttle because I am using 2,350 rpm. The 75% rule applies for sure to fixed pitch props that are running at 2,700 rpm at 7,500 msl at full throttle. > From: "Paul Lipps" > > The old rule about 75% power at full throttle at 7500'-8000' with > a normally aspirated engine is only true for slower airplanes. If > you're getting good ram pressure recovery, the 75% power altitude > for a TAS of 200 mph is 9500', and at 250 mph TAS, it's 10,500'. > We're actually getting more power because of our higher speed than > we originally thought we were getting! -- Lorn H. 'Feathers' Olsen, MAA, DynaComm, Corp. 248-345-0500, mailto:lorn@dynacomm.ws LNC2, O-320-D1F, 1,100 hrs, N31161, Y47, SE Michigan