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ACRO E-mail Archive Thread: [Acro] Re: PITTS S1 FUEL TANK PROBLEM

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ACRO E-mail Archive Thread: [Acro] Re: PITTS S1 FUEL TANK PROBLEM



                


Thread: [Acro] Re: PITTS S1 FUEL TANK PROBLEM

Message: [Acro] Re: PITTS S1 FUEL TANK PROBLEM

Follow-Up To: ACRO Email list (for List Members only)

From: "Rparker" <rparker at voltage.net>

Date: Tue, 19 Mar 2002 01:50:02 UTC


Message:

  John,
5052 is a better material for the repair, or building a tank.
1100 is nearly pure aluminum and is there fore in my opinion way too soft
and weak for the job. The stop drill is a must, just do not need to rivet
the patch on.
Bob Parker
Mena, AR.
----- Original Message -----
From: "John Harlan" <jmharlan at ev1.net>
To: <Gandrmarsh at aol.com>; <acro at gf24.de>
Sent: Monday, March 18, 2002 7:08 PM
Subject: [Acro] Re: PITTS S1 FUEL TANK PROBLEM


> Hi Glen-
> I had two cracks on the back surface of my Aviat tank in an S1E.  I tried
an
> aluminum doubler bonded on with PRC, however I didn't stop drill the
cracks.
> This worked for about 150 hours but eventually the crack continued out
from
> under the doubler.  Stop drilling would certainly extend the life of the
> repair.
>
> When I removed the tank, I also found two more cracks just starting on the
> front side.
>
> The Pitts plans call out 1100-O aluminum.  I don't know if Aviat still
uses
> this, but based on the failure history, I suspect so.  A better material
to
> use is 5052 condition H32.  This material has better fatigue life under a
> similar stress environment because it has about double the yield strength,
> and it is also a fatigue resistant alloy.  Most others (all that I know
of)
> making aluminum tanks use 5052.  You can get experimental fuel tanks for
> your Pitts made from 5052 from two or three different sources.  It might
be
> possible to get a field approval for a certified airplane - don't know.
>
> I've suggested to Ed S. at Aviat that they consider a material change.  I
> didn't get a reply.  Anybody know if he still works there?
>
> When I was shopping for a tank, I did an unscientific poll - it turned up
7
> reports of failures on 1100 tanks, none on 5052 tanks.  Anecdotal, I
> know....
>
> John
> S1E (on second tank - this time 5052)
> Austin
>
>
> ----- Original Message -----
> From: <Gandrmarsh at aol.com>
> To: <acro at gf24.de>
> Sent: Monday, March 18, 2002 6:52 AM
> Subject: [Acro] PITTS S1 FUEL TANK PROBLEUM
>
>
> >
> >
> >   I have a fuel tank that cracked on the front pannel of the tank. This
> will
> > be the 3rd tank in appx. 800 hours. The first one oil caned on the aft
> side.
> > I tried to weld it but it oxadized and became brittle and re cracked, so
I
> > replaced it to a new one from Pitts. A good friend of mine had a S1T and
> the
> > same thing happened to him. This time it oil caned up front. So this is
my
> > second tank. This makes 3 tanks between 2 of us in less than 800 hours.
Am
> I
> > missing something here? I believe there was a post about S1 fuel tanks a
> > while back that I missed. Can any one help me on what to do? Does anyone
> make
> > a tank that doesn't crack? Or do I go back to the factory? We have over
10
> > S1's in our chapter so this information would be helpful.
> >
> >                                 Glen Marshman Chapter 12 Prez
> >
> >
>
>
>
>



                


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