wing reinforcement
I cut a piece of pressure treated lattice left over from my neighbors' shed project. Sanded it to a very tight fit. That replaced the weak spar joiner. Epoxied that to the wing, and used med CA to seal the rest of the wing joint, and wicked a lil thin CA around the edges to penetrate. I put in a piece of light ply to span the inside of the fuse(epoxied), drilled and tapped that for a 1/4-20 nylon bolt to hold the wing down. Wick thin CA into the threads to stiffen. It makes for a really strong joint, yet will allow the wing to break off on a hard impact (hopefully wont have to test that theory).
The tail really needs to be reinforced. I used .024 music wire with 4/40 screws thru the rudder and tail, and screwed to the pair of landing gear wood screws. That makes the tail at least 3 times stronger, eliminating the flex due to deflection or air pressure.
Remember, this is a slow speed high alpha airplane, its not supposed to be a speed demon. The surfaces are huge, and at high speeds, even sealed surfaces will flutter. Hoping to have some vid captures we took Friday at lunch soon.
Steve