This is due in part to the fact that it is a high wing, high drag aircraft with a high aspect ratio wing and large barn door ailerons that provide considerable adverse yaw that must be corrected for in flight to keep that airplane wallowing around like a sick whale. To fly an RC cub well requires considerable skill. The fact that you have flown a full scale cub will in no way prepare you to fly an RC cub. As a matter of fact The mechanics of flying any RC aircraft (I am not taling about Wx, regs and navigation) can be more of a challenge than learning to fly full scale