I have flown 5 type of rc heli. First one Apachee Ah-64 3D modified to 4D, very nice n stable but my daughter flew it into the sawah padi and lost.

Second one is 2D heli modified (just put some weight infront so it become almost 3D that can move forward) and easy to control if u really can understand your heli.

Third one 3D heli modified - hardly to control bcoz i think the receiver have the problem. Sumtime rotating even after switch off transmitter for sumtime.. at last smoking during flying and rest in grave.

Then i bought another 3D heli again to train my son. But still hardly to control.

The fifth one i bought Colco Cyclone Thunderbird 4D for RM280 from kemen marketting. They have spare part also. But until now still tuning the heli coz during training flight the stabilizer bar patah,... then i change it to steel bar but the bar bengkok. So still trying to tuning after trying a few bar.

Normally the servo control is selected using the screw type switch inside the gyro box. before flying the heli, set all the servo to zero. then you put some power and adjust the servo one by one. ie adjust the turning first so that your heli will not spinning while take off. after resolve that problem then you adjust another servo which is control the yaw of the heli which is cause the unballance left and rightof the heli. then goes for the third one. then after you can mAKE the heli harver (fly stable) then you can happily fly it ever after. Hope this will give a little help to you. anyway i m new also with this hobby.