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Subject: Re: [FlyRotary] Re: Fuel tank repair
From: Ernest Christley <echristley@att.net>
Date: Sat, 17 Aug 2013 14:12:05 -0400
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Message-ID: <e5353203-3592-4a3a-8e9d-c67224ec919c@email.android.com>

Mark McClure <markmcclure@me.com> wrote:
>Navy T-34C's have a rubber bladder lining of the fuel tanks. They use
>jet fuel so it's not an issue of ethanol but more of a if there is a
>leak just replace the bladder solution.
>
>Not sure about your fuel tank design but could you not use some sort of
>a liner?
>
>Mark
>
>On Aug 16, 2013, at 7:23 AM, Ernest Christley <echristley@att.net>
>wrote:
>
>> I think this is going to be the solution, Lynn.  The tank isn't
>exactly smooth at the outlet, so I'm going to have to make some
>modifications to the general concept, and I may end up with a bit of
>unusable fuel, which I don't have now.  But, I have a bulkhead fitting
>on hand, so I'll at least give it a try.
>> 
>> 
>> On 08/15/2013 12:41 PM, Lehanover@aol.com wrote:
>>> If the tank is smooth on the inside. You could hand ream the hole
>out to big enough for a bulkhead fitting. The long run of the fitting
>would go into the tank. Make up a thick aluminum disc, big enough to
>cover the crack. Use fuel tank sealer in the hole and under the washer.
>Tighten the jamb huts with sealant under each.
>>> You could have the same washer under the bottom side as well.
>>> Now the crack is covered top and bottom with sealant and washers.
>Trim off any excess fitting and radius inlet to improve flow. The
>fitting can now be pointed in any direction.  I can make a drawing if  
>            you need one.
>>>  
>>> Lynn E. Hanover  
>>>  
>>>  
>>>  
>>> In a message dated 8/15/2013 10:30:37 A.M. Eastern Daylight Time,
>echristley@att.net writes:
>>> The Delta has one ~50gal tank that sits behind the back seat.  Not 
>>> wishing to fight the compatibility issues between epoxies and
>whatever 
>>> the government may mandate be put into our fuel supply next year, I
>went 
>>> with an welded up aluminum tank which I epoxied into the turtleback.
>>> 
>>> For fittings, I welded in two NPT adapter bungs to the bottom of the
>
>>> tank.  One for fuel supply, and one for return.   I had a small,
>seeping 
>>> leak at the supply fitting. I needed to turn the NPT-to-AN6 90
>degree 
>>> adapter one more turn to make it seal.  I got it most of the way
>around 
>>> before I heard a sharp ping.  The bung that I welded in is now
>split.  
>>> And that split is guaranteed to expand with vibration.
>>> 
>>> The only solution I can think if is to cut a round hole to remove
>the 
>>> bung, and then construct two plates (one for the inside of the tank
>and 
>>> one for the outside), with a hole in the center for the 90 degree 
>>> adapter.  The problem is, the tank can now be viewed as a bomb.  How
>can 
>>> I cut a hole in the bottom of the tank, which will require that I
>work 
>>> in an enclose space, without the possibility of a spark making short
>
>>> work of everything?
>>> 
>>> --
>>> Homepage:  http://www.flyrotary.com/
>>> Archive and UnSub:  
>http://mail.lancaironline.net:81/lists/flyrotary/List.html
>> 

Not with the baffling 
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