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richard_trickel(at)yahoo.
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 Posted: Tue Apr 26, 2011 5:48 am Post subject: Fuel damage |
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O.C.
By the time Larry bought the plane from the original builder It had been sitting for several years with auto gas in the tanks which contained alcohol in Arizona. I saw the damage to the inside of the tanks and It was extensive resin lifting but rember that the spar appeared intact. Also the fuel only attact the bonding resin and tank seal resin and not the prepreg itself. Vance and I worked out a repair which included a lot of sanding and retaping the ribs. I Also did not know the spar had broken so maybe larry could give more info
Rich
--- On Tue, 4/26/11, bakerocb(at)cox.net <bakerocb(at)cox.net> wrote:
| Quote: |
From: bakerocb(at)cox.net <bakerocb(at)cox.net>
Subject: Re: KIS accidents??
To: "David, Larry" <lgdavid(at)roadrunner.com>, kis-list(at)matronics.com
Date: Tuesday, April 26, 2011, 12:22 PM
4/26/2011
Hello Larry, You wrote: "..... Gasohol had eaten into the webbing of the main spar and weakened it so that it snapped on the landing."
The above statement is the first time that I had heard of this aspect of your accident. I am puzzled by this conclusion because:
A) Your airplane was so new that I have difficulty believing that the ethanol alcohol (10 percent?) in the gasoline would have had enough time to significantly weaken the spar.
B) I did not believe that cured epoxy would be significantly affected by ethanol alcohol, especially in such a short time as your airplane existed.
C) How did you conclude that the spar had indeed been weakened by the ethanol alcohol.
Can you please educate me? Thanks,
OC
=========================
| Quote: | From: Larry David (lgdavid(at)roadrunner.com)
To: kis-list(at)matronics.com (kis-list(at)matronics.com)
Sent: Saturday, April 23, 2011 1:10 AM
Subject: Re: KIS accidents??
My TR1 with a Subaru engine went into limp home mode on my second test flight and I made an off field landing in a celery field. Since the engine was still turning at about 1100 rpm, it tore the nose off as it ground to a halt in the field. Plane protected me and kept me alive, but I never rebuilt it. The left turn in the nose was part of the decision but more importantly Gasohol had eaten into the webbing of the main spar and weakened it so that it snapped on the landing. Strangely, the rear spar was still in tack. So you can add one to the not rebuilt column of damaged TR1s. Larry
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bakerocb
Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA
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| Posted: Tue Apr 26, 2011 6:41 am Post subject: Fuel damage |
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4/26/2011
Hello Rich, Thanks for the clarification. I was unaware of the airplane's
history.
You Wrote: "Also the fuel only attact the bonding resin and tank seal resin
and not the prepreg itself."
I had naively assumed when it came to alcohol resistance that all epoxies
were pretty much the same. Now I gather that what you are saying is that the
epoxy used to impregnate the prepreg fabric and the laminating epoxy used by
the builder for bonding the wing together had significant differences when
it came to alcohol resistance.
Maybe we could all use some education when it comes to selecting our
laminating epoxy. Thanks.
OC
===============================================
From: Richard Trickel
To: kis-list(at)matronics.com
Sent: Tuesday, April 26, 2011 9:45 AM
Subject: Re: Fuel damage
O.C.
By the time Larry bought the plane from the original builder It had been
sitting for several years with auto gas in the tanks which contained alcohol
in Arizona. I saw the damage to the inside of the tanks and It was
extensive resin lifting but rember that the spar appeared intact. Also the
fuel only attact the bonding resin and tank seal resin and not the prepreg
itself. Vance and I worked out a repair which included a lot of sanding and
retaping the ribs. I Also did not know the spar had broken so maybe larry
could give more info
Rich
========================================================
From: bakerocb(at)cox.net <bakerocb(at)cox.net>
Subject: Re: KIS accidents??
To: "David, Larry" <lgdavid(at)roadrunner.com>, kis-list(at)matronics.com
Date: Tuesday, April 26, 2011, 12:22 PM
4/26/2011
Hello Larry, You wrote: "..... Gasohol had eaten into the webbing of the
main spar and weakened it so that it snapped on the landing."
The above statement is the first time that I had heard of this aspect of
your accident. I am puzzled by this conclusion because:
A) Your airplane was so new that I have difficulty believing that the
ethanol alcohol (10 percent?) in the gasoline would have had enough time to
significantly weaken the spar.
B) I did not believe that cured epoxy would be significantly affected by
ethanol alcohol, especially in such a short time as your airplane existed.
C) How did you conclude that the spar had indeed been weakened by the
ethanol alcohol.
Can you please educate me? Thanks,
OC
| | - The Matronics KIS-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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