heli help

peter bermingham

hi all my raptor 30 is wagging like mad now changed the fearthing shaft and main shaft that were bent the tail servo is a futaba 9254 and a gy401 the servo is jittering i pluged it out of the gyro and into the rx still jittering and every 10 seconds or so it junps back and over around 3mm would this cause the wagging as i think servo should stay still and in a hover its going like mad jittering its running on lipo and needle valve is out a turn and a half running on 20% it is a os 30 engine thanks all

syl77

Is the tail servo twitching when you have the heli sitting still on the bench, if so your tail servo could be on the way out or was damaged some way - was the heli recently crashed. Also, you say you are using a lipo, are you also using a regulator and step down?

peter bermingham

yes twitching when sitting on bench have a regulator as well the align one yes it was crashed the lad i bought it of crashed it

coolwings

Time for a new servo, or receiver, or crystal (if there is one).

Put a good servo plug into the tail servo socket of the receiver. If the problem does not appear in the new servo, the original tail servo is kaput.
If the jittering appears in the healthy servo, you are a channel down in your receiver.

peter bermingham

coolwings thanks of now to try that

Bruthal

Sounds like the servo is gone alright, you can try it direct into a different channel other than the rudder on the receiver also, and see how it is. If its the same then its likely the servo, especially if the receiver is operating the other servos ok.

A twitching tail servo will have the tail wagging badly, each time it twitches, the gyro will correct it the other way.

peter bermingham

lads thanks did what ye said and yes its the servo thats gone that was a great help thanks