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bill mcclellan
Joined: 28 Jan 2010
Posts: 43
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 Posted: Wed May 12, 2010 6:43 pm Post subject: Skin wrinkling outside fuel fill |
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I see in the archives that there has been a problem for some with the fuselage skin wrinkling in the area of the plastic fuel fill tube. My question is, why is it happening to only a few and is there a conclusive reason for it happening? Maybe the fuel fill tube should not be affixed to the inside skin of the fuselage as stated in the building manual but instead allowed to be more of a floating fit so the rubber hose will take up the expansion/contraction the plastic tube might be doing. Can anyone give me the answer to this question?
Thanks,
Bill McClellan
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ward.t(at)xtra.co.nz
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| Posted: Thu May 13, 2010 2:40 am Post subject: Skin wrinkling outside fuel fill |
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Bill,
In the early days (1996)the manual stated that the plastic 'cobra' tube
should be fibre glassed with Bid directly onto the fuselage skin in two
places.
It was then found on early models that exposure to the sun on a hot day
would cause the cobra to expand and therefore deform the fuselage skin
inwards. This happened to me. I then found via the builders web, that other
people were reinforcing the inside fuse skin with BID layers and placing
blue foam between the cobra and fuselage skin to absorb that expansion. I
am not sure if that was a Europa Club Mod or Company Mod however
it does avoid that deformation. I had to take my cobra out, push the skin
back out with the help of hot water over the outside and my son pushing
from the inside on a moulded piece of wood! Then reinforce the inside
fuselage skin, blue foam between and replace the cobra with new Bid
brackets.
Why it happened to me? I left the aircraft out in the open on a very hot 33
degree C day without the reinforcement.
Does it now say not to affix it to the fuseskin? If not, then do they expect
it to support itself, or the cover to support it?
Interesting.
Hope this helps,
Tim
Tim Ward
12 Waiwetu Street'
Fendalton,
Christchurch.
NEW ZEALAND
Ph. 64 3 3515166
Mob 021 0640221
Email ward.t(at)xtra.co.nz
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kevann(at)gotsky.com
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| Posted: Thu May 13, 2010 5:01 am Post subject: Skin wrinkling outside fuel fill |
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Hi Bill,
I think there was a tech bulletin about this that recommends reinforcing
with a couple layers of bid to the inside of the fuselage in that area.
I ended up putting a coupe layers of carbon fiber in the whole area. I did
not use foam between the cobra and fuse. With the light just right I can now
see a very slight "print" of the bid that attaches the cobra to the fuse.
Kevin
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milneab(at)btinternet.com
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| Posted: Fri May 14, 2010 1:07 am Post subject: Skin wrinkling outside fuel fill |
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My first had the problem which I cured by cutting the filler
moulding-to-fuselage strap. I deduced that the problem was caused by the
fuel tank distorting. Be patient - it took several months for the skin to
iron itself out to the original.
The strap was not fitted on my second Europa and I made sure there was a gap
between the hard sections of the filling line within each hose section.
There is no sign of skin distartion nearly two years after completion.
G CEYK
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