Syma Forum

Check for any hair caught in the main rotor shaft.  I wonder if there's some extra friction somewhere creating enough drag that the gyro and the trim can't handle it.  Do the rotors spin freely and smoothly?  It sounds like one of the main rotor motors might not be spinning fast enough for some reason?  The two coaxial rotors spinning in opposite directions along with the gyro controller should keep things within the adjustments range for trimming.  You could have a defective heli, something caught slowing one rotor down, or a gyro issue I would guess.  Maybe there is some extra friction within the main shaft so one of the rotors isn't spinning to the correct RPM.  Or the remote control trimming knob might be glitched some where.  Open up the remote control to take a look to see if the wires from the trim knob going to the motherboard are attached and look okay.

Have you got a 2 channel switch at the top of the controller ??? above the green light ??  A & B, if so try switching over, but give it time to work that may sort it.

Hope this helps.

Bernie. 

Are you letting the gyros stabilize?  The copter needs to sit on a flat, horizontal surface for 10-12 seconds immediately after you plug in the battery.