X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 25 Nov 2007 03:16:27 -0500 Message-ID: X-Original-Return-Path: Received: from fmailhost01.isp.att.net ([207.115.11.51] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2502247 for lml@lancaironline.net; Fri, 23 Nov 2007 14:07:03 -0500 Received-SPF: pass receiver=logan.com; client-ip=207.115.11.51; envelope-from=dskeele@bellsouth.net Received: from fwebmail31.isp.att.net ([204.127.221.131]) by isp.att.net (frfwmhc01) with SMTP id <20071123190625H0100n1jl6e>; Fri, 23 Nov 2007 19:06:25 +0000 X-Originating-IP: [204.127.221.131] Received: from [98.200.123.175] by fwebmail31.isp.att.net; Fri, 23 Nov 2007 19:06:24 +0000 From: dskeele@bellsouth.net X-Original-To: "Lancair Mailing List" Subject: Re: [LML] request info fuel lines LNC2 Disposition-Notification-To: dskeele@bellsouth.net X-Original-Date: Fri, 23 Nov 2007 19:06:24 +0000 X-Original-Message-Id: <112320071906.20687.474724B000070D65000050CF22243322829B0A02D2089B9A019C04040A0DBF0A040A0A059C0B@att.net> X-Mailer: AT&T Message Center Version 1 (Oct 30 2007) X-Authenticated-Sender: ZHNrZWVsZUBiZWxsc291dGgubmV0 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_20687_1195844784_0" --NextPart_Webmail_9m3u9jl4l_20687_1195844784_0 Content-Type: text/plain Content-Transfer-Encoding: 8bit Bill H., I have done much the same with 1/4" Polyurathane tubing for 15 years and 800 hrs. I changed out the entire system each 5 yeaars with no degredation each time, just cautious. Due to the possibility of a cockpit fire, I wraped the tubing with an Aluminum Tape from Spruce and it with plain electrical tape for antichaffing. It greatly improved the fire resistance of a direct flame and the vibration resistance. Don Skeele N320J 235/O-320 ------------- Original message from Bill Hannahan : -------------- I used .5 in nyla flow from Spruce, from all three tanks to a 4 position selector valve. It is sleeved with polyethylene tubing where it goes through bulkheads and bonded to any surface it touches with silicone. I originally used the plastic compression fittings from spruce but found they were too hard and subject to brittle failure. I could not find aluminum fittings and went with brass fittings from Mc Master Carr. I mounted the fuel pumps provided with the kit on the outboard rib of the gear well to serve as boost pumps, just inches from the finger strainer, they make vapor lock a non problem, even with mo gas. I always keep av gas in the header tank and use that for takeoff. Advantages are, each run is a single continuous piece of tubing, abrasion and fatigue resistance, light weight, fairly easy installation. Obviously this is all behind the firewall. So far no signs of fatigue cracking, abrasion or enbrittlement. The material is as flexible as it was new after 15 years, 2100 hrs. Come to think of it, it was not very flexible when new. To make small radius bends I had to heat the material with a heat gun almost to the melting temperature, then bend it to a slight over bend, and let it slowly air cool in that position. Once cool it is permantly bent to the desired shape. I won’t pretend this is simple, experiment with some scrap. The thermal conductivity is low so you have to heat it slowly and evenly, keep the heat moving. It becomes transparent just before it melts. The right temperature is in the transition to transparency. Heat only the section you want to bend, not the ends that will go into the fitting. Regards, Bill Hannahan wfhannahan@yahoo.com Get easy, one-click access to your favorites. Make Yahoo! your homepage. --NextPart_Webmail_9m3u9jl4l_20687_1195844784_0 Content-Type: text/html Content-Transfer-Encoding: 8bit

Bill H.,

     I have done much the same with 1/4" Polyurathane tubing for 15 years and 800 hrs.  I changed out the entire system each 5 yeaars with no degredation each time, just cautious.  Due to the possibility of a cockpit fire, I wraped the tubing with an Aluminum Tape from  Spruce and it with plain electrical tape for antichaffing.  It greatly improved the fire resistance of  a direct flame and  the vibration resistance.  Don Skeele    N320J  235/O-320

------------- Original message from Bill Hannahan <wfhannahan@yahoo.com>: --------------

 
I used .5 in nyla flow from Spruce, from all three tanks to a 4 position selector valve. It is sleeved with polyethylene tubing where it goes through bulkheads and bonded to any surface it touches with silicone.
 
I originally used the plastic compression fittings from spruce but found they were too hard and subject to brittle failure. I could not find aluminum fittings and went with brass fittings from Mc Master Carr.
 
I mounted the fuel pumps provided with the kit on the outboard rib of the gear well to serve as boost pumps, just inches from the finger strainer, they make vapor lock a non problem, even with mo gas. I always keep av gas in the header tank and use that for takeoff.
 
Advantages are, each run is a single continuous piece of tubing, abrasion and fatigue resistance, light weight, fairly easy installation.
 
Obviously this is all behind the firewall. So far no signs of fatigue cracking, abrasion or enbrittlement. The material is as flexible as it was new after 15 years, 2100 hrs.
 
Come to think of it, it was not very flexible when new. To make small radius bends I had to heat the material with a heat gun almost to the melting temperature, then bend it to a slight over bend, and let it slowly air cool in that position. Once cool it is permantly bent to the desired shape.
 
I won’t pretend this is simple, experiment with some scrap. The thermal  conductivity is low so you have to heat it slowly and evenly, keep the heat moving. It becomes transparent just before it melts. The right temperature is in the transition to transparency. Heat only the section you want to bend, not the ends that will go into the fitting.
 
 
 


Regards,
Bill Hannahan

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