RE: J3 cub, crash on take off nearly every time.
JPANN,
Also, out of curiosity did you guys try putting an incidence meter on the recently deceased cub? I'm wondering if there was a warp in one of the wings that would be tough to pick up on.. If the plane wanted to turn right all the time you may have had a small amount of 'wash-in' going on in the left wing (wingtip twisted slightly so that it has a slightly higher angle of attack than the right wing)..
Just thinking out loud...