I love my H9 J3 Cub, but I used to hate it. Mine has an OS 46 in it. The first year out with it was very frustrating because I just didn't know how to take it off. Basically, I figured I would just pour the throttle on and blast off like my other planes. Well, that didn't work . Sure, it got off the ground (REAL FAST) climbed about 8 ft, rolled over and crashed. After about 4 of these sessions the whole front end needed rebuilding so I shelved it for a year. I had had it! NOW the best advise I ever got was right here on RCU. Very slowly throttle up, get it rolling but NOT pitching over. I don't use the elevator to keep the tail down, just very gentle, gradual throttle application. When the tail steps us as speed increases I may have to feed in a SLIGHT touch of elevator to keep her level if the tail starts to come up a little too much. A little more throttle, SLIGHT elevator input and she climbs out nice and scale like. Now I don't fly her on windy or even breezy days because as mentioned that presents a whole new set of challenges. Now, getting her down was something so back to the advice I was given. I set a nice slow idle, fly with the struts to create a little more drag, shim the motor mount to create about 2 degrees of down thrust. She now settles into a very nice descent, very easy to land. You'll really like your Cub if you can get it to survive the learning curve. Good advice as I found on RCU sure helps.