X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 27 Jan 2009 18:46:36 -0500 Message-ID: X-Original-Return-Path: Received: from [216.200.145.38] (HELO omta0106.mta.everyone.net) by logan.com (CommuniGate Pro SMTP 5.2.12) with ESMTP id 3454069 for lml@lancaironline.net; Mon, 26 Jan 2009 21:25:59 -0500 Received-SPF: none receiver=logan.com; client-ip=216.200.145.38; envelope-from=bknotts@buckeye-express.com Received: from dm37.mta.everyone.net (sj1-slb03-gw2 [172.16.1.96]) by omta0106.mta.everyone.net (Postfix) with ESMTP id 899357285AA for ; Mon, 26 Jan 2009 18:29:01 -0800 (PST) X-Eon-Dm: dm37 Received: by dm37.mta.everyone.net (EON-AUTHRELAY2 - 48f0e111) id dm37.4978a713.15f631 for ; Mon, 26 Jan 2009 18:25:22 -0800 X-Eon-Sig: AQK8DXBJfnCSQaTC9wIAAAAB,3d52176d31d12e2fa42d762abb1a7f3e X-Original-Message-ID: <497E708F.4040901@buckeye-express.com> X-Original-Date: Mon, 26 Jan 2009 21:25:19 -0500 From: "F. Barry Knotts" Reply-To: bknotts884@earthlink.net User-Agent: Thunderbird 2.0.0.19 (Windows/20081209) MIME-Version: 1.0 X-Original-To: Lancair Mailing List Subject: Re: [LML] Re: Fuel Tank Testing References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------040500030406050402010100" This is a multi-part message in MIME format. --------------040500030406050402010100 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Bob's method is really sound. Just don't be confused by temperature or barometric changes. Check both temp and barometer readings at the start and end to be sure that your leak or lack of leak is not just Charles's Law, /V/_1 / /T/_1 = /V/_2 / /T/_2, or Gay-Lussac's Law, /P/_1 / /T/_1 = /P/_2 / /T/_2, talking. Barry Knotts Robert Pastusek wrote: > Bryan wrote: > > I am in the middle of testing my fuel tanks for leaks with a vacuum > pump. How long is long enough to hold vacuum to prove it wont leak? > > > Be very careful with the vacuum pump. More than one Lancair builder has > "imploded" his wing tanks with this not-so tried and true method. There have > --------------040500030406050402010100 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Bob's method is really sound. Just don't be confused by temperature or barometric changes. Check both temp and barometer readings at the start and end to be sure that your leak or lack of leak is not just Charles's Law,

V 1 / T 1 = V 2 / T 2,

or Gay-Lussac's Law,

P 1 / T 1 = P 2 / T 2,

talking.

Barry Knotts

Robert Pastusek wrote:

Bryan wrote:

I am in the middle of testing my fuel tanks for leaks with a vacuum
pump.  How long is long enough to hold vacuum to prove it wont leak?


Be very careful with the vacuum pump. More than one Lancair builder has
"imploded" his wing tanks with this not-so tried and true method. There have

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