Ok, here's the situation. I am just getting into this hobby. My dad has had T-Rex 450sa for I'd say around 10 years, maybe more. It has been on the shelf for most that time. When I told him I was looking for one to buy, he told me to"crash his first before I buy a new one". So he gave it to me yesterday. Has a spektrum DX6 park flyer system transmitter and a spektrum AR6000 parkflier receiver. Dad says that it is really hard to fly. And according to a hell guru buddy of mine says one reason is cause this receiver is mentioned for an airplane, not heli. The heli does have a futaba GY240 S.M.M. rate gyro on it. What is all your thoughts? Can I upgrade the receiver to help stability? Any thoughts are welcome. Thanks.