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Old 08-08-2007, 05:40 AM
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John 38
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Default RE: Installing wing tubes

I have a 66" aerobatic model with a saito 90 driving it and the tube in it is or looks like brown paper, filling unknown. No sign of it not coping with the load

the tubes load function is transferring the load between wing and joining rod at the points where the tube is glued to the wing ribs. the rest of the tube while forming some structural strength is for guiding the rod thru the holes in the ribs!! ie, you can do without tube if you ensure reinforced rib holes all line up!!

in the old days , we used to make our tubes from brown wrapping paper rolled over polished and well waxed wing joiner rod, and varnished as paper rolled on. I suppose you could use a resin if wanted - main point is not to use a shrinking fluid ( such as dope ) otherwise you may not get tube off forming rod. Make the tube long enough to do both wings and fusalage width and simply cut into 3. If the tube is too long then it may be difficult to remove in which case make in sections.

hope this helps

John