RE: J3 cub, crash on take off nearly every time.
I've flown multiple size cubs (both Full Size and models) over the years - this weekend I test flew at 96" Cub for a fellow club member that he got for a song and a dance - wish I had known about it, I would have bought it.. The plane had a 90 4S on the front that had not been run in a few years. Once we got it started and running well, up I went. As I taxing out, he was worried that I would ground loop it - I told him right before I started the take-off that the Cub likes rudder and to get the tail flying before trying to break ground. Take-off, stayed on the rudder, got tail flying, and it just rose right off the runway. Just flew around at 1/4 throttle until I ran out of fuel. Dead stick landing, no problem- what a floater. Just remember that the bigger the Cub, the more you have to be on rudder.