Need Advise on Counter Clockwise Twitch

[abbotts]

A Lil while back I had a crash and ever since the rebuild whenever I give the Heli throttle...ie...accelerate, the nose of the Heli twitches left. It's bout to drive me crazy. Any advise on what it could be? Thanks Fellas!

[salrica]

Usually is related at head speed.
What motor and pinion are you using?
On what heli?
Or maybe main drive or tail gears.
Original tail and main gears or copy?
Is it just on a fast punch up ?
What throttle curves?

[dwdw910]

The speed control could be glitching and that momentary lack of throttle causes the twitch.

I would bet money that this is it... Does it make a "chick chick" sound with the twitch?

[dwdw910]

As you hit the throttle and the speed control momentarily fails to supply power to the motor- the helicopter frame will rotate from gyroscopic forces independently from the main rotor. Then as the power is reapplied- the helicopter will straighten back..

This slight power interruption will cause the twitch that you described.

[Wolfpackin]

Something is probably slipping in the tail drive system (belt, tail shaft at hub, pinion, tail drive gear etc.) or binding in the tail pitch control (pitch slider, tail grip bearings, tail control arm/rod etc.).

That CCW yaw, or twitch, indicates a loss of tail authority at that moment.

JMHO based on the limited amount of info.