X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 15 Jan 2008 16:38:01 -0500 Message-ID: X-Original-Return-Path: <5zq@cox.net> Received: from eastrmmtao101.cox.net ([68.230.240.7] verified) by logan.com (CommuniGate Pro SMTP 5.2c4) with ESMTP id 2645016 for lml@lancaironline.net; Mon, 14 Jan 2008 15:50:49 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.240.7; envelope-from=5zq@cox.net Received: from eastrmimpo01.cox.net ([68.1.16.119]) by eastrmmtao101.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20080114205009.QLB129.eastrmmtao101.cox.net@eastrmimpo01.cox.net> for ; Mon, 14 Jan 2008 15:50:09 -0500 Received: from bh1 ([72.209.225.157]) by eastrmimpo01.cox.net with bizsmtp id d8p31Y00Q3QP3uo0000000; Mon, 14 Jan 2008 15:49:03 -0500 X-Original-Message-ID: <005f01c856ef$1ebfd500$6401a8c0@bh1> From: "Bill & Sue" <5zq@cox.net> X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] To air filter or NOT to air filter - THAT is the question. X-Original-Date: Mon, 14 Jan 2008 15:50:38 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_005C_01C856C5.35B09490" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 This is a multi-part message in MIME format. ------=_NextPart_000_005C_01C856C5.35B09490 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Matt, Somewhat surprisingly, the bird has a fairly good chance of making it = through the prop unscathed. Here's why: Assuming 2400 rpm and 200 mph (17,600 feet/min), the airplane moves = forward 7.33 feet per engine revolution . With a 2 blade prop, the = airplane moves 3.66 ft per blade passage. If a bird has a length of 1 = foot, then he has a better than 66% chance of making it through! A 3 or = 4 blade prop would reduce his chances somewhat. Of course, his elation at making it all the way through a spinning = propeller would be fairly short lived if he was heading for the cowling = or windshield. =20 Bill Harrelson N5ZQ 320 1,450 hrs N6ZQ IV under construction If I did have a filter, It might stop a bird but at 200 mph, that is = doubtful but then again the prop might make the best air filter of all. ------=_NextPart_000_005C_01C856C5.35B09490 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi Matt,

Somewhat surprisingly, the bird has a=20 fairly good chance of making it through the prop unscathed. Here's=20 why:

Assuming 2400 rpm and 200 mph (17,600 = feet/min),=20 the airplane moves forward 7.33 feet per engine = revolution . With a 2=20 blade prop, the airplane moves 3.66 ft per blade passage. If a=20 bird has a length of 1 foot, then he has a better than 66% = chance of=20 making it through! A 3 or 4 blade prop would reduce his chances=20 somewhat.

Of course, his elation at making it all = the way=20 through a spinning propeller would be fairly short lived if he was = heading for=20 the cowling or windshield.

Bill Harrelson

N5ZQ 320 1,450 hrs

N6ZQ IV under = construction

If I did have a filter, It might = stop a=20 bird but at 200 mph, that is doubtful but then again the prop might = make the=20 best air filter of all.

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