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frankm(at)clara.net
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 Posted: Fri Mar 01, 2013 9:46 am Post subject: Stuck tailplane |
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Graham Singleton's tip for unsticking a stuck tailplane worked a treat - thank you Graham. You put a close-fitting bar through the pip-pin hole for the other tailplane and while tapping outwards gently with a heavy hammer pull on the stuck tailplane. It only moves about 5 thou at a time initially, but it moves and eventually is free. But here is the lesson I learnt. Although I had greased the torque tube when I fitted it last, the two close-fitting sleeves that it passes through wipe most of the grease off and the outboard end has had the most wiping. That was where the corrosion was, and I think it had got into the pip-pin hole from the botton as there was some corrosion on the pip-pin. In future before fitting I will put grease into the outboard sleeve through the pip-pin hole and spread it around the inside of the sleeve with a long stick through the torque tube hole.
My other problem with stiff ailerons is definitely caused by swelling of the tufnol bushes. Tufnol is cotton fabric in layers impregnated with phenolic resin. The end-grain is what is visible when looking down on the bush, and being cotton which is exposed it is not surprising if the cotton absorbs some moisture. The absorption rate is not great (according to the specification), but it is not zero.
Frank
[quote][b]
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grahamsingleton(at)btinte
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| Posted: Fri Mar 01, 2013 10:17 am Post subject: Stuck tailplane |
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Glad it worked Frank!
Graham
From: Frank Mycroft <frankm(at)clara.net>
To: europa-list(at)matronics.com
Sent: Friday, 1 March 2013, 17:43
Subject: Stuck tailplane
Graham Singleton's tip for unsticking a stuck tailplane worked a treat - thank you Graham. You put a close-fitting bar through the pip-pin hole for the other tailplane and while tapping outwards gently with a heavy hammer pull on the stuck tailplane. It only moves about 5 thou at a time initially, but it moves and eventually is free. But here is the lesson I learnt. Although I had greased the torque tube when I fitted it last, the two close-fitting sleeves that it passes through wipe most of the grease off and the outboard end has had the most wiping. That was where the corrosion was, and I think it had got into the pip-pin hole from the botton as there was some corrosion on the pip-pin. In future before fitting I will put grease into the outboard sleeve through the pip-pin hole and spread it around the inside of the sleeve with a long stick through the torque tube hole.
My other problem with stiff ailerons is definitely caused by swelling of the tufnol bushes. Tufnol is cotton fabric in layers impregnated with phenolic resin. The end-grain is what is visible when looking down on the bush, and being cotton which is exposed it is not surprising if the cotton absorbs some moisture. The absorption rate is not great (according to the specification), but it is not zero.
Frank
[quote]http://www.matronics.co========================
" target="_blank" href="http://forums.matronics.com/">http://forums.mat --> [/b][b]
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