Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Thu, 17 Feb 2005 00:08:14 -0500 Message-ID: X-Original-Return-Path: Received: from [198.36.178.141] (HELO stoel.com) by logan.com (CommuniGate Pro SMTP 4.3c1) with ESMTP id 742363 for lml@lancaironline.net; Wed, 16 Feb 2005 23:33:21 -0500 Received-SPF: none receiver=logan.com; client-ip=198.36.178.141; envelope-from=JJHALLE@stoel.com Received: from PDX-SMTP.stoel.com ([172.16.103.137]) by gateway1.stoel.com with ESMTP id <334091>; Wed, 16 Feb 2005 20:42:15 -0800 Received: from PDX-MX6.stoel.com ([172.16.103.64]) by PDX-SMTP.stoel.com with Microsoft SMTPSVC(5.0.2195.6713); Wed, 16 Feb 2005 20:32:29 -0800 X-MimeOLE: Produced By Microsoft Exchange V6.0.6249.0 content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Subject: RE: Air intake formula X-Original-Date: Wed, 16 Feb 2005 20:32:29 -0800 X-Original-Message-ID: <17E9FE5945A57A41B4D8C07737DB607201B8FC4E@PDX-MX6.stoel.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: lml Digest #1124 Thread-Index: AcUUFuUH64PaHAsXSsK7PMZc1vr57AAkgSKg From: "Halle, John" X-Original-To: "Lancair Mailing List" X-Original-Return-Path: JJHALLE@stoel.com X-OriginalArrivalTime: 17 Feb 2005 04:32:29.0827 (UTC) FILETIME=[B0CE5D30:01C514A9] We recently enlarged the air intake in the cowel of our legacy from 2.5" = (factory standard) to 3.5" (the same diameter as the fuel servo.) For = you Continental folks, the Lycoming cowel has a third intake hole just = for engine air below the prop. We also moved the hole up closer to the = prop to take advantage of ram air. To our surprise, we got no boost in = MAP and lost a few kts. airspeed. Presumably the intake hole is now too = big. Does anyone know the formula for calculating the diameter of the = air intake for a fuel injected engine (or know where we could find it?)