X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 21 Nov 2005 21:06:54 -0500 Message-ID: X-Original-Return-Path: Received: from mta-out-1.udlp.com ([207.109.1.8] verified) by logan.com (CommuniGate Pro SMTP 5.0.2) with ESMTP id 841897 for lml@lancaironline.net; Mon, 21 Nov 2005 16:22:08 -0500 Received-SPF: none receiver=logan.com; client-ip=207.109.1.8; envelope-from=Christopher.Zavatson@baesystems.com Received: from mnexch01.MSGDOMAIN.MPLS.UDLP.COM ([10.1.62.20]) by mta-out-1.udlp.com (8.12.10/8.12.10) with ESMTP id jALL7Vbk002886 for ; Mon, 21 Nov 2005 15:07:32 -0600 Received: from asdmngwia.udlp.com ([10.1.62.22] RDNS failed) by mnexch01.MSGDOMAIN.MPLS.UDLP.COM with Microsoft SMTPSVC(6.0.3790.211); Mon, 21 Nov 2005 15:17:24 -0600 Received: from DM-MN-06-MTA by asdmngwia.udlp.com with Novell_GroupWise; Mon, 21 Nov 2005 15:21:13 -0600 X-Original-Message-Id: X-Mailer: Novell GroupWise Internet Agent 6.5.4 X-Original-Date: Mon, 21 Nov 2005 15:21:01 -0600 From: "Christopher Zavatson" X-Original-To: Subject: [LML] Re: Closed Air Plenum for TSIO550 Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable Content-Disposition: inline X-OriginalArrivalTime: 21 Nov 2005 21:17:24.0040 (UTC) FILETIME=[F761E480:01C5EEE0] Colyn, << ..any idea what the performance improvement is for adding that?>> I don't know if there are any Continental driven Lancairs with before and = after numbers. I have one case study with a Lycoming O360. =20 I made the switch to a plenumed system on my L360 about 16 months ago. = Having flown with the original baffle system for 6 year, I had lots of = data for comparison. In general, the hottest cylinders dropped 30+ = degrees. I also gained 5 kts in airspeed. Obviously a system could be = optimized for speed or temperatures depending on one's goals. Related data can be found in NASA report 3405: "An Experimental Investigation of the Aerodynamics and Cooling of a = Horizontally-Opposed Air-Cooled Aircraft Engine Installation" http://www.n91cz.com/cooling/Copy_of_NASA_Cooling_Report.pdf=20 Chris Zavatson (firm believer in plenums) N91CZ 360 std www.N91CZ.com