Return-Path: Received: from [199.185.220.223] (HELO priv-edtnes28.telusplanet.net) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 794043 for flyrotary@lancaironline.net; Tue, 15 Mar 2005 02:47:32 -0500 Received-SPF: pass receiver=logan.com; client-ip=199.185.220.223; envelope-from=haywire@telus.net Received: from Endurance ([207.81.25.155]) by priv-edtnes28.telusplanet.net (InterMail vM.6.01.04.00 201-2131-118-20041027) with SMTP id <20050315074646.RWRX16460.priv-edtnes28.telusplanet.net@Endurance> for ; Tue, 15 Mar 2005 00:46:46 -0700 From: "Todd Bartrim" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Leaking Mogas Date: Mon, 14 Mar 2005 23:46:29 -0800 Message-ID: <001001c52933$1a41fbd0$0201a8c0@Endurance> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0011_01C528F0.0C1EBBD0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook CWS, Build 9.0.2416 (9.0.2910.0) Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0011_01C528F0.0C1EBBD0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Hi Bob; I think you've scored a direct hit. You've exactly described the weather of the last few weeks and the weather of the day in question. It was ~ -6C that night and was ~+8C when I had the leak. I should have considered this myself, as we deal with ice/frost damage prevention in all our construction up here. We spend vast sums of money to eliminate water in our instrumentation air system to prevent this sort of damage, but we've gotten so successful at it, that it isn't as much of problem anymore, so I didn't consider that as a cause when I should have. I will still investigate much more closely to conclusively determine the cause, but your "over active mind" seems to have picked a good theory. If I can determine that the damage is confined to the single tank, then I still have 5 other tanks to use, so I likely won't remove the tank for repair until a more opportune time. Todd (glad I have the ability to isolate tanks and draw from any one of them) Todd, Water is powerful stuff. I am not sure how your weather has been this winter but if it has been any thing like what I imagine it has been back and forth below and above freezing several times. The water in the tank could have cycled several times from liquid to solid. I can imagine the water getting behind an edge of the pro seal in the corner of the tank and freezing lifting the seal from the aluminum. If this happens several times I could see the water working its way completely under the pro seal. As for the time lag between when you put the fuel in the tank and when it first began to run out I can only suppose that the temps in that part of the world are steal hovering around the 0 c mark at night and only getting above 0 c during the day for a short period of time. It could have been that there was ice in the area between the aluminum and the pro seal, and it took that long for the fuel to thaw through the ice. Of course this all supposition, a product of an over imaginative what if mind. Bob Perkinson Hendersonville, TN. RV9A N658RP Reserved If nothing changes Nothing changes Now what exactly happened there? It didn't leak a drop for close to an hour, then suddenly it let several gallons leak out in less than 10 minutes. It must have been an aggressive chemical reaction that dissolved the fuel tank sealant. ------=_NextPart_000_0011_01C528F0.0C1EBBD0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi=20 Bob;

I think you've scored a direct hit. You've = exactly=20 described the weather of the last few weeks and the weather of the day = in=20 question. It was ~ -6C that night and was ~+8C when I had the leak. I = should=20 have considered this myself, as we deal with ice/frost damage = prevention in=20 all our construction up here. We spend vast sums of money to eliminate = water in=20 our instrumentation air system to prevent this sort of damage, but we've = gotten=20 so successful at it, that it isn't as much of problem anymore, so I = didn't=20 consider that as a cause when I should have. I will still investigate = much more=20 closely to conclusively determine the cause, but your "over active mind" = seems=20 to have picked a good theory.

If I can determine that the damage is confined = to the=20 single tank, then I still have 5 other tanks to use, so I likely won't = remove=20 the tank for repair until a more opportune time.

Todd (glad I have the ability to isolate = tanks and draw=20 from any one of them)

Todd,

Water is powerful = stuff. I am not sure how your = weather has=20 been this winter but if it has been any thing like what I imagine it = has been=20 back and forth below and above freezing several times. The water in the tank could = have=20 cycled several times from liquid to solid. I can imagine the water = getting behind=20 an edge of the pro seal in the corner of the tank and freezing lifting = the=20 seal from the aluminum. If this=20 happens several times I could see the water working its way completely = under=20 the pro seal. As for = the time lag=20 between when you put the fuel in the tank and when it first began to = run out I=20 can only suppose that the temps in that part of the world are steal = hovering=20 around the 0 c mark at night and only getting above 0 c during the day = for a=20 short period of time. = It could=20 have been that there was ice in the area between the aluminum and the = pro=20 seal, and it took that long for the fuel to thaw through the ice. Of course this all = supposition, a=20 product of an over imaginative what if mind.

Bob Perkinson
Hendersonville, TN.
RV9A N658RP=20 Reserved
If nothing changes
Nothing changes
=

Now what exactly happened there? It didn't leak a drop for = close to=20 an hour, then suddenly it let several gallons leak out in less than = 10=20 minutes. It must have been an aggressive chemical reaction that = dissolved=20 the fuel tank sealant.=20

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