X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 50 [XX] Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 25 Apr 2007 22:28:20 -0400 Message-ID: X-Original-Return-Path: Received: from smtp4.na.baesystems.com ([63.164.202.13] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 2010829 for lml@lancaironline.net; Wed, 25 Apr 2007 21:36:44 -0400 Received-SPF: none receiver=logan.com; client-ip=63.164.202.13; envelope-from=Christopher.Zavatson@baesystems.com Received: from BLUMS0022.bluelnk.net (blums0022.na.baesystems.com [10.40.96.145]) by smtp4.na.baesystems.com (8.13.6/8.13.6) with ESMTP id l3Q1ZnUq007855 for ; Wed, 25 Apr 2007 21:35:49 -0400 (EDT) Received: from GLDMS00005.goldlnk.rootlnka.net ([10.44.64.11]) by smtp1.na.baesystems.com (8.13.6/8.13.6) with ESMTP id l3Q1Zqs2007681 for ; Wed, 25 Apr 2007 21:35:52 -0400 (EDT) Received: from gldms10602.goldlnk.rootlnka.net ([10.64.39.19]) by GLDMS00005.goldlnk.rootlnka.net with Microsoft SMTPSVC(6.0.3790.1830); Wed, 25 Apr 2007 21:35:52 -0400 Received: from GLDMS10607.goldlnk.rootlnka.net ([10.64.39.20]) by gldms10602.goldlnk.rootlnka.net with Microsoft SMTPSVC(6.0.3790.1830); Wed, 25 Apr 2007 18:35:51 -0700 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C787A3.38F0A43E" Subject: RE: [LML] Cooling Drag X-Original-Date: Wed, 25 Apr 2007 18:35:50 -0700 X-Original-Message-ID: In-Reply-To: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [LML] Cooling Drag Thread-Index: AceHegLRfeJEqXaQRJCY3OdcyzqRowAA4CSg References: From: "Zavatson, Christopher J \(US SSA\)" X-Original-To: "Lancair Mailing List" X-OriginalArrivalTime: 26 Apr 2007 01:35:51.0613 (UTC) FILETIME=[396BBED0:01C787A3] This is a multi-part message in MIME format. ------_=_NextPart_001_01C787A3.38F0A43E Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Art <> I didn't change anything below the cylinders this iteration. The mod targeted pressure recovery and sealing above the cylinders. Still on my to-do list is a modification to the exit. Later Lancair models have nice exit tunnels on either side of the nose gear which makes work in this area much easier.=20 =20 <> The volume difference is not the driver. The gain comes from better control over pressure recovery and sealing. 360 inlets have a very high inlet velocity which makes them more suseptible to problems. Sealing is, of course, a universal issue. =20 <> This is a real deterrent. Unfortunately changes like this become major projects. I am certainly glad I did it on my plane, but since your temps are already good, motivation levels would certainly be lower. To evaluate the potential gains ahead of time one would need to measure mass flow and pressure at key points in the existing cooling system - not a minor task either. =20 Chris =20 =20 Chris Zavatson N91CZ 360std www.N91CZ.com ------_=_NextPart_001_01C787A3.38F0A43E Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Art

<<are you doing anything to = manage the=20 air flow under the cylinders>>

I didn't change anything below the cylinders=20 this iteration. The mod targeted pressure recovery = and=20 sealing above the cylinders. Still on my to-do list is a = modification to=20 the exit. Later Lancair models have nice exit tunnels on either = side of=20 the nose gear which makes work in this area much easier.=20

<<I=20 looked at the plenum but with the=20 reduced volume over the engine I = wasn't sure=20 there would be a gain.>>

The volume difference is not the = driver. =20 The gain comes from better control over pressure recovery and=20 sealing. 360 inlets have a very high inlet velocity = which makes them=20 more suseptible to problems. Sealing is, of course, a universal=20 issue.

<<Then there was the work to = make=20 one.>>

This is a real deterrent. Unfortunately = changes=20 like this become major projects. I am certainly glad I did it = on my=20 plane, but since your temps are already good, motivation = levels would=20 certainly be lower. To evaluate the potential gains = ahead of time=20 one would need to measure mass flow and pressure at key points = in the existing cooling system - not a minor task=20 either.

Chris

Chris = Zavatson

N91CZ

360std

www.N91CZ.com
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