X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 15 Dec 2005 00:57:53 -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 5.0.4) with ESMTP id 882836 for lml@lancaironline.net; Wed, 14 Dec 2005 23:55:29 -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 jBF4cPbk006573 for ; Wed, 14 Dec 2005 22:38:25 -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); Wed, 14 Dec 2005 22:50:33 -0600 Received: from DM-MN-06-MTA by asdmngwia.udlp.com with Novell_GroupWise; Wed, 14 Dec 2005 22:54:43 -0600 X-Original-Message-Id: X-Mailer: Novell GroupWise Internet Agent 6.5.4 X-Original-Date: Wed, 14 Dec 2005 22:54:36 -0600 From: "Christopher Zavatson" X-Original-To: Subject: [LML] Re: Air filters Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable Content-Disposition: inline X-OriginalArrivalTime: 15 Dec 2005 04:50:33.0624 (UTC) FILETIME=[15236980:01C60133] Marv, previous mailing ended up with a space in the URL Angier, I used a K&N filter (33-2006) in my air box and also used the K&N = equation, quoted by a few others here (A=3DCID x RPM/20839), to get an = approximate size. A few additional items to consider in their estimate = are: Their recommendation is probably based on a filter with some level = of contamination (from normal automotive road use) in sea level atmospheric= conditions. I would guess that, in general, aircraft filters are not = exposed to the same level of dust and dirt and are much easier to keep on = the clean end of the spectrum. (I clean and/or replace mine every year.) = Also, as we go up in altitude, the reduction in air density will reduce = the pressure drop across the filter. Finally, we generally don't do all = of our flying at full rpm, further reducing the pressure drop across the = filter. While I could only fit 80% of their recommended size, performance is = excellent -even for the few seconds I spend at seal level. =20 http://www.n91cz.com/airbox/bot-with-filter.jpg good luck, Chris Zavatson N91CZ 360 std www.N91CZ.com