Large Model Association Forum

Alan Cantwell 1131 wrote:Without this cardboard tube, would the wing wobble? If the answers yes, it's structural,

Rob Buckley wrote:Is the tube through the fuselage a bit of bog roll too?



You could lay up glass on the metal tube to make a new wing sleeve, but that would be a complete swine to get off again.

Rob Buckley wrote:Is the tube through the fuselage a bit of bog roll too?

yes the bog roll effect is what it came with

If so, a far better solution would be to replace the whole lot with a slightly bigger aluminium tube & phenolic outer combination in the wings & the fuz.

that a massive undertaking as the wing tube are cardboard as well and they are in good nick and i take the advice what's not bust don't fix

Another solution would be good fitting disks on the fuz sides and ribs of decent plywood. That would make assembly slightly more fiddly, but the structure would be better.

i like this idea make a disc or 2 each side for better glue holds for the tube to fit in the Fuz

You could lay up glass on the metal tube to make a new wing sleeve, but that would be a complete swine to get off again.

If you cover the metal tube with a layer of plastic covering film, ultracote, monocote etc, 3 or 4 good coats of wax, some mould release and spiral wrap the tube with 2 layers of 6 oz. fibreglass tape about 4" wide, you can get the f/glass sleeve off.
It does take a bit of doing, though soaking in hot water will help dissolve the mould release agent.

Cheers,
Dave.

Dave Collis 2296 wrote:I don't know if I would use just paper.
I used the plastic wing covering as it has a shiney finish that wont absorb any resin that gets on it. Paper being slightly porous will soak up any resin that might get on it. You will now have a solid metal/fiberglass tube assy.
Make sure to wax very thoroughly and use a mould release (PVA) made for use with fiberglass.

Phil Clark wrote:Some epoxy laminating resins stick to cling film (been there, done that)........covering film or parcel tape + wax is the best solution.

Cardboard outer sockets in this application are utterly useless......unlike phenolic, cardboard can and will compress under constant load so the fit will become loose & sloppy. Phenolic or GRP sockets are the best solution. Bonding a new GRP socket into the existing cardboard socket in the wing won't really solve the issue........the card can still compress between the new GRP socket & the ribs + if the new GRP socket isn't bonded fully end to end into the cardboard, the new socket can start to move in the old..........best solution, get rid of the lot & replace with a quality phenolic/aluminium assembly.

Phil