Re: KR> Mogas blues... Update

[Mark Langford via KRnet]

I screwed that up, so to clarify:

Sparky wrote:

>>I had the same problem in my KR-2 that I built in 1982 using shell 
epon and vesimid hardner.  The fiberglass lining fell to the bottom of 
the tank causing fuel starvation so, I relined the tank and went to 100 
low lead and it was ok. <<


Epon and Versamid are what Rand Robinson sent me in the early nineties 
as their standard "laminating" epoxy, so there are likely a LOT more 
tanks that were made out of this stuff, so beware to folks who don't 
know what their tanks are made of. I quit using it after my first big 
layup, the horizontal stab (I believe it was), which turned my arms 
bright red and made them itch like crazy.  I wore latex gloves at the 
time, so it was fumes alone that caused that allergic reaction.


Mark Langford
m...@n56ml.com
http://www.n56ml.com


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Re: KR> Mogas blues... Update

[bjoenunley via KRnet]

> There has been a bit of interest in my misadventure with GAS and the
> damaged fuel tank system in my SuperCub Clone.
>
I believe this was the problem that I had, causing the carberator to clog on 
takeoff. 
Joe Nunley Baker Florida 
null
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Re: KR> Mogas blues... Update

[Gary Sack via KRnet]

I had the same problem with my KR II built in 1981 of unknown materials.
Went to the airport one day to find the fuel had drained through the
cockpit. I cut the top off, made a cardboard template, and had my son weld
up an aluminum tank to fit the space. I lost a couple of gallons capacity:
I had 21 gallons before... Won't be able to fly 750 miles anymore, but I'm
not sure I want to.

On Sep 26, 2018 7:42 PM, "sparksfly2ms--- via KRnet" 
wrote:

> I had the same problem in my KR-2 that I built in 1982 using shell epon
> and vesimid hardner.
>
> The fiberglass lining fell to the bottom of the tank causing fuel
> starvation so, I relined the tank
>
> and went to 100 low lead and it was ok. Sparky
>
>
>
>
>
>
> Sent from Windows Mail
>
>
>
>
>
> From: Jeff Scott via KRnet
> Sent: ‎Wednesday‎, ‎September‎ ‎26‎, ‎2018 ‎5‎:‎47‎ ‎PM
> To: krnet
> Cc: Jeff Scott
>
>
>
>
>
>
> There has been a bit of interest in my misadventure with MOGAS and the
> damaged fuel system in my SuperCub Clone.
>
> Today I made it to the airport and cut the top out of the fuel tanks.  The
> mess I found inside the tanks is incredible, and disheartening.
>
>
>
> It would appear these tanks were fabricated using 3/8" blue foam as a core
> material.  Overall quality was marginal to begin with, then the tanks were
> apparently sealed by painting the inside with an extra coating of epoxy
> resin.  As the chemicals in the local Mogas attacked the resins, the
> coating of resin peeled away from the inside of the tanks in sheets that
> rolled up and slowly made their way to the low spot in the tanks.  The blue
> foam delaminated during the removal process, so I will need to fabricate
> new tops for the tanks.  I knew when I chose to leave these tanks in the
> wings when I was finishing this project that they were an unknown, and I
> may eventually have to rebuild or replace them.  So now that has come home
> to roost.
>
>
>
> The inside of the tanks will require significant clean up, then a lay up
> or two of glass before a final prep, prime and sealing with a chemical
> resistant slosh compound.   These tanks were built in as an integral part
> of the wing.  If not for that, I would cut them out and install metal
> tanks.  However, at this point in time, I don't want to do a complete wing
> rebuild and recover, so will rebuild the tanks.  If I ever need to recover
> the wings, then these tanks will likely be replaced.
>
>
>
> Photos of the mess and the clean up/rebuild process are posted on my web
> site at:
>
> 
>
>
>
> Jeff Scott
>
> Cherokee Village, AR
> ___
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Re: KR> Mogas blues... Update

[sparksfly2ms--- via KRnet]

I had the same problem in my KR-2 that I built in 1982 using shell epon and 
vesimid hardner.

The fiberglass lining fell to the bottom of the tank causing fuel starvation 
so, I relined the tank

and went to 100 low lead and it was ok. Sparky






Sent from Windows Mail





From: Jeff Scott via KRnet
Sent: ‎Wednesday‎, ‎September‎ ‎26‎, ‎2018 ‎5‎:‎47‎ ‎PM
To: krnet
Cc: Jeff Scott






There has been a bit of interest in my misadventure with MOGAS and the damaged 
fuel system in my SuperCub Clone. 

Today I made it to the airport and cut the top out of the fuel tanks.  The mess 
I found inside the tanks is incredible, and disheartening. 

 

It would appear these tanks were fabricated using 3/8" blue foam as a core 
material.  Overall quality was marginal to begin with, then the tanks were 
apparently sealed by painting the inside with an extra coating of epoxy resin.  
As the chemicals in the local Mogas attacked the resins, the coating of resin 
peeled away from the inside of the tanks in sheets that rolled up and slowly 
made their way to the low spot in the tanks.  The blue foam delaminated during 
the removal process, so I will need to fabricate new tops for the tanks.  I 
knew when I chose to leave these tanks in the wings when I was finishing this 
project that they were an unknown, and I may eventually have to rebuild or 
replace them.  So now that has come home to roost.

 

The inside of the tanks will require significant clean up, then a lay up or two 
of glass before a final prep, prime and sealing with a chemical resistant slosh 
compound.   These tanks were built in as an integral part of the wing.  If not 
for that, I would cut them out and install metal tanks.  However, at this point 
in time, I don't want to do a complete wing rebuild and recover, so will 
rebuild the tanks.  If I ever need to recover the wings, then these tanks will 
likely be replaced.

 

Photos of the mess and the clean up/rebuild process are posted on my web site 
at:



 

Jeff Scott

Cherokee Village, AR
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