X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from rtp-iport-2.cisco.com ([64.102.122.149] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2491450 for flyrotary@lancaironline.net; Fri, 16 Nov 2007 09:25:02 -0500 Received-SPF: softfail receiver=logan.com; client-ip=64.102.122.149; envelope-from=echristley@nc.rr.com Received: from rtp-dkim-2.cisco.com ([64.102.121.159]) by rtp-iport-2.cisco.com with ESMTP; 16 Nov 2007 09:24:23 -0500 Received: from rtp-core-1.cisco.com (rtp-core-1.cisco.com [64.102.124.12]) by rtp-dkim-2.cisco.com (8.12.11/8.12.11) with ESMTP id lAGEONPY006004 for ; Fri, 16 Nov 2007 09:24:23 -0500 Received: from xbh-rtp-211.amer.cisco.com (xbh-rtp-211.cisco.com [64.102.31.102]) by rtp-core-1.cisco.com (8.12.10/8.12.6) with ESMTP id lAGENlF0020006 for ; Fri, 16 Nov 2007 14:24:23 GMT Received: from xfe-rtp-201.amer.cisco.com ([64.102.31.38]) by xbh-rtp-211.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Fri, 16 Nov 2007 09:24:20 -0500 Received: from [10.82.240.201] ([10.82.240.201]) by xfe-rtp-201.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Fri, 16 Nov 2007 09:24:20 -0500 Message-ID: <473DA814.8040202@nc.rr.com> Date: Fri, 16 Nov 2007 09:24:20 -0500 From: Ernest Christley Reply-To: echristley@nc.rr.com User-Agent: Thunderbird 1.5.0.13 (X11/20070824) MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Cowling Airflow References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 16 Nov 2007 14:24:20.0524 (UTC) FILETIME=[60BE36C0:01C8285C] X-TM-AS-Product-Ver: SMEX-8.0.0.1181-5.000.1023-15548.002 X-TM-AS-Result: No--15.785600-8.000000-2 X-TM-AS-User-Approved-Sender: No X-TM-AS-User-Blocked-Sender: No Authentication-Results: rtp-dkim-2; header.From=echristley@nc.rr.com; dkim=neutral Lehanover@aol.com wrote: > > In a message dated 11/15/2007 11:30:27 P.M. Eastern Standard Time, > DLOMHEIM@aol.com writes: > > I also was wondering if there might be some advantage during ground > operations and climb out if I install some kind of door as seen in the diagram... > > Doug Lomheim > RV-9A, FWF...contemplating the placement of stuff... > > > > > > > As in race cars, with cowl induction for the carburetor, you will find high > pressure air in front of the windshield base. Probably lower pressure along > the sides of the cowl might work. > > > Lynn E. Hanover > > > Taking that into account, you could turn the door around and counter-weight it. The high pressure in front of the windshield will push the door closed in flight. Counter weight it such that the updraft created by the heat is just enough to push the door open. When the engine cools, the door will fall closed again. I've heard of it being done, but I can't remember where. Place the door above the dipstick for a little more convenience.