davidfee

If it is a lightweight slowflyer, then it doesn't need to be incredibly strong. I would cut and bend some 2mm music wire to fit inside the tubes, and bend the dihedral angle into the wire. The wire should go into each tube about 2cm, so the wire should be ~4cm long. You can add some light fiberglass around the outside once you have made the joint, but it should not be required.

Good luck,
-David