Return-Path: Received: from pop3.olsusa.com ([63.150.212.2] verified) by logan.com (CommuniGate Pro SMTP 3.4.5) with ESMTP id 777816 for rob@logan.com; Sun, 13 May 2001 06:36:19 -0400 Received: from fep21-svc.tin.it ([212.216.176.74]) by pop3.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-71175U5500L550S0V35) with ESMTP id com for ; Sun, 13 May 2001 01:29:22 -0400 Received: from tin.it ([212.216.211.71]) by fep21-svc.tin.it (InterMail vM.4.01.03.13 201-229-121-113) with ESMTP id <20010513053615.KPAL10372.fep21-svc.tin.it@tin.it> for ; Sun, 13 May 2001 07:36:15 +0200 Message-ID: <3AFE1DC9.414E4BA9@tin.it> Date: Sun, 13 May 2001 07:38:17 +0200 From: "John F. Herminghaus" MIME-Version: 1.0 To: lancair.list@olsusa.com Subject: Winglets and fuel vents References: <200105112006.NAA06652@hawk.mail.pas.earthlink.net> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailing-List: lancair.list@olsusa.com Reply-To: lancair.list@olsusa.com <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> AC 20-53A, Protection of Airplane Fuel Systems Against Fuel Vapor Ignition Due to Lightning, recommends putting fuel vents as far as possible from high risk lightning strike areas. Wing tips and especially winglets are in the highest risk category. One knowledgeable person described winglets to me as lightning rods. I am installing the fuel vents in my winglets in the bottom skin as close as possible to the inboard edge. Had I read AC20-53A in time, I would have put them in the wings between BL 165 and BL 171. The tube from the vent line will be run up into the winglet and back to the vent to solve the overflow problem. I have installed the 3/8" vent lines. For the record, I do not fly intentionally through thunder storms, but lightning is unpredictable, and there has been a strike on a IV. By the way, if my convertible is any indication, there is a real risk with the vents on the outboard face of the winglet of an unfortunate combination of wind direction, speed and rain filling your tanks with water. John Herminghaus IV-P I-VVVV >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/Users/Mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>