Helo. I know this is an old thread, but maybe my question will stir up the hornet's nest of you expert builders. I have a 40-sized Telemaster and due to its weight and liking extra power, put a supertigre .61 on the nose. This Telly would fly mild to wild. The only thing I didn't like was the one-piece 72" wing.

Well, last year, I had a minor crash due to a low-altitude tip-stall from a touch-and-go and turning too sharply without gaining enough speed. :-( There was minor damage and I now have a plan to build a 3-piece wing. I am going to build the two wing sections 31.5" long as usual, but I will build two sets of center sections. One center section will be 5" long to make a total wingspan of 68" for more acrobatic "clipped wing" flight. The second center section will be 17" long to make the total wingspan 80" to qualify as a "big-bird". I don't want to put any dihedral in it to minimize complexity. The center sections will have dowels out the front and holes in the back to screw the wing in and not use rubber bands.

My actual question is about the wing joiner. I was told I should put the (a) wing joiner through the rib between the top and bottom main spar are located. On the 40-size plans, the main spars are 3/8" x 1/2" leaving 1/2" in between. Is less than 1/2" for a wing joiner tube or metal bar thick enough to support any wing loads. The joiner being less than 1/2" will be too small to be the only thing keeping the wing onto the airplane. Should I do like I saw in the photos in a previous post in this thread of using a front and back joiner, the front being well in front of the main spar and the back being about 3/4 way from the leading edge?

I intend to make a mount in the wing for a nylon bolt holding the wing to the center section and having the bottom of the center sections open to access the bolt.

I'd appreciate any input on this. Thank you,
Bryan