Return-Path: Sender: (Marvin Kaye) To: lml Date: Mon, 05 May 2003 15:14:38 -0400 Message-ID: X-Original-Return-Path: Received: from [32.97.166.32] (HELO prserv.net) by logan.com (CommuniGate Pro SMTP 4.1b4) with ESMTP id 2334029 for lml@lancaironline.net; Mon, 05 May 2003 15:12:16 -0400 Received: from b8p5r1 (slip-12-65-210-76.mis.prserv.net[12.65.210.76]) by prserv.net (out2) with SMTP id <2003050519115420206fmuube>; Mon, 5 May 2003 19:11:54 +0000 From: "Larry Henney" X-Original-To: "'Lancair Mailing List'" Subject: RE: [LML] Re: N686KB Lancair 360 cooling X-Original-Date: Mon, 5 May 2003 14:12:14 -0500 X-Original-Message-ID: <000001c3133a$3ee17620$4cd2410c@b8p5r1> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.2627 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2919.6600 Berni, There have been at least 4 designs on this project. My oil cooler like Lee's is located in front of #2 cylinder. The firewall mounting location has had at least three different air intake locations that I'm aware of (left or right cowl with naca scoop, or off the aft baffles). The better of these three air cooling feeds I'm told is air off the right side of the cowl. Don Goetz told me once that most of the left side cowl guys placed their Naca scoop in a dead zone. Additionally, I was once told that propwash was better on the right side than the left. Don't know if that's true, however. The angle to the relative airflow could also be very important. For example if your climb angle is roughly 7 deg nose up then I'd suggest the scoop should point down about 7 deg to optimize climb cooling. One benefit of this location is structural integrity. Attaching to the firewall is less stressful on the engine mount than my installation. Bottom line: I love the in front of # 2 cylinder oil cooler location. It does require healthy bracketry to handle the G's and vibration. On my 360 I see vernatherm temp (83C) for 90% of my flights. In climb I occasionally see 95C. During racing I've never seen over 102C. I suspect you=92re A&P is correct. That is, the size of the cooler is adequate. However, your intake airflow could probably be optimized. Finally, don't look to live in the Green Arc of oil temps in an LNC2. On a hot day you will get into the yellow band for 10-20 minutes following climb out. Also, prolonged gear down operation will drive the oil through the high limits. If one wanted green arc operation in all flight regimes we'd find oil cooling drag excessively performance limiting. The plane is a pearl in most flight regimes. Unlike the spam can world there are occasionally flight regimes that require pilot insight (airmanship). Good luck in your analysis. Larry Henney LNC2 IO-360 Ft Worth, TX=20