RE: Challenger II information needed
Whoa. Think about this purchase one more time. I had one. And what a bi**h to fly. A friend of mine is an International Champion RC pilot and he had a terrible time as well. The CG is absolutely critical and even then it changes throughout the flight due to fuel use. It is not a well designed model. Be warned. I finally gave away my airframe and never saw the plane flown again. Two flights total.
Good luck!