ORIGINAL: cyclicoverload
The speed control is bad for sure, the speed control pomers the RX, if you swapped RX's and it did the same thing then the speed control neens to be replaced.
does your DF-4 uses the four in one controller?? the RX,tail rotor controller and main motor controller on one board or are the parts seperate?
when i swapped RXs the problem moved from one heli to the other. in othere words the bad heli was now good and the good heli was now bad. the problem is in the heli with the "bad" RX in it. i can make mine right by using his RX, but his heli goes bad. thats why i think is the RX. when i swapped them it fixed the problem on mine, but moved it to his.
by 4 in 1 do you mean the RX has all the wires connected to one "board"? sorry i'm a newbie. my reciever has a "circuit board" inside it....all the wires to the heli run thruogh it. power, main motor, tail motor, and 2 gyros. i have no idea if this helps or even answers that question.