Return-Path: Received: from rokland5.awh.us ([67.15.10.31] verified) by logan.com (CommuniGate Pro SMTP 4.3c1) with ESMTP-TLS id 742144 for flyrotary@lancaironline.net; Wed, 16 Feb 2005 18:55:45 -0500 Received-SPF: none receiver=logan.com; client-ip=67.15.10.31; envelope-from=bob@bob-white.com Received: from bgp01386375bgs.brodwy01.nm.comcast.net ([68.35.160.229]:34111 helo=quail) by rokland5.awh.us with smtp (Exim 4.43) id 1D1Z0V-0005oV-TQ for flyrotary@lancaironline.net; Wed, 16 Feb 2005 17:55:00 -0600 Date: Wed, 16 Feb 2005 16:54:58 -0700 From: Bob White To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] I found the power Message-Id: <20050216165458.6b24aac1.bob@bob-white.com> In-Reply-To: References: X-Mailer: Sylpheed version 1.9.2 (GTK+ 2.4.9; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Antivirus-Scanner: Clean mail though you should still use an Antivirus X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - rokland5.awh.us X-AntiAbuse: Original Domain - lancaironline.net X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - bob-white.com X-Source: X-Source-Args: X-Source-Dir: Paul, Do you think the extra power would make up for the drag if you just leave the cowling off? Nah, probably a bad idea. :) Bob White On Wed, 16 Feb 2005 17:26:58 -0600 "Paul" wrote: >I hit 5600 static rpm's. In the past, the best I could > hope for was 5200, most of the time settling for 5100 rpm's. I > taxiied back in and installed the top cowling....max rpm's 5100. Took > the top cowling back off....max rpm's 5600. One more try....5100 with > the cowling back on. It is beginning to become more clear to me, that > one of two things are affecting rpm's. Option one is that with the > top cowling on the engine is ingesting heated air and just cannot > develop the same power as when it ingests outside unheated air. > Option two is the muffler bearing may be worn. I'm kinda leaning > toward option one. > to all who reply. Paul Conner > -- http://www.bob-white.com N93BD - Rotary Powered BD-4 (real soon)