I recently built the FT Simple Cub and painted it. I tried taking it off and it seems that the B Motor, battery, or propeller (don't know which) is causing the airplane to not be able to take off. At first I tried to take it off, and it drove on the ground, but didn't takeoff. Then I tried to hand launch it, and it did just a straight nose dive in the ground. The propeller broke, so I replaced it. Had the same problem the next day with it not being able to takeoff. Any suggestions? Should I change to a C Pack? Bigger battery? Bigger propeller? All of the above? Anything will help!