I have the Clipped Wing 48 which is basically the same. ALso there is another member with a J-3 in our club. I have a TT54 FS in mine. It is touchy to get off on grass, because it wants to nose over. I put a block behind the rear gear wire to move the wheels forward a little. You have to be ready on the elevator to keep the nose level. It will jump into the air early if too much is used. This causes a tip stall and cartwheel. I let it run on the ground to build speed as long as I can. Bigger wheels might help the takeoff run on grass. The wingis tilted up when starting the takeoff, because it is short from wing to tail. With the high angle of attack at the start of the run it wants to get in the air too soon. Holding up elev. to keep the tail down can cause it to jump early. Better to roll on the power and stay on the rudder to let it run. Flies OK in the air, but it will tip stall if too much elevator input is used in a loop or hard turn. I like flying it because it is never boring. If they all flew like trainers, it wouldn't be fun. Does a good knife edge for a high wing. The other Cub in our club also has the same tendencies. The aspect ratio of the wing is high, and that will help cause the stalling. It lands fine as long as a little speed is carried into final. Don't try to float it in like a trainer. Use some power and/or keep the nose down.