X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 26 Sep 2005 14:27:38 -0400 Message-ID: X-Original-Return-Path: Received: from mta-out-1.udlp.com ([207.109.1.8] verified) by logan.com (CommuniGate Pro SMTP 5.0c2) with ESMTP id 733676 for lml@lancaironline.net; Mon, 26 Sep 2005 13:24:26 -0400 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 j8QHFubk025518 for ; Mon, 26 Sep 2005 12:15:56 -0500 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, 26 Sep 2005 12:20:17 -0500 Received: from DM-MN-06-MTA by asdmngwia.udlp.com with Novell_GroupWise; Mon, 26 Sep 2005 12:23:35 -0500 X-Original-Message-Id: X-Mailer: Novell GroupWise Internet Agent 6.5.4 X-Original-Date: Mon, 26 Sep 2005 12:24:19 -0500 From: "Christopher Zavatson" X-Original-To: Subject: [LML] Re: Engine Cooling and Cabin Heat Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable Content-Disposition: inline X-OriginalArrivalTime: 26 Sep 2005 17:20:17.0254 (UTC) FILETIME=[906CA060:01C5C2BE] Mark, << ... air .... was actually backing-up at the inlets.>> While all inlets will vary, some portion of the pressure recovery occurs = in front of the inlet due to this "backing-up". The velocity ratio of the = inlet will tell you how much air is flowing through relative to the free = stream velocity. The lower the velocity ratio, the more air is backing up = in front of the inlet. For a given installation, increasing the inlet = diameter will lower the velocity ratio. =20 A good discussion of cowl inlet design can be found in NASA report CR 3405 = starting on page 39. http://www.n91cz.com/cooling/Copy_of_NASA_Cooling_Repo= rt.pdf=20 On my 360 the oil cooler is also fed from the air entering the main inlets = with the oil cooler exit throttled down to about 5 in^2. =20 Chris Zavatson N91CZ 360 std. www.N91CZ.com =20