ok i did one more modification that really helped it. i glued on some medium 1/16th sq balsa to most of the leading edge, now it hardly flexes in flight and gets MUCH more of the lift from the long wings. i think now it needs a motor and battery upgrade though as it is now i have to use full throttle just to do level circles. it handles very well and shows no signs of tip stalling or anything odd. as i was flying it, the geardrive started to loosen from the foam and slowly changed the thrustline si it flew sorta crabbed
but by tomorrow, it should be all fixed up and waiting for a chance to test again!
when i was building it, i thought that the rudder might have been too thick, but i needed it to support the horizontal stab but it seems plenty effective to me. deflection is about 35 degrees each way.
i dunno if anyone would use it but i could do up a little "plan/guide" on how to make one. its actually fairly simple, just need the right foam parts etc.