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At last I've sorted the problem after much frustration.
The heli was not built by me, which is not an excuse but is a moral to always check.
After lots of trials and errors, I took the tail and boom off and found the drive shaft bearing in the wrong position on the shaft and the shaft inserted with the bearing nearer the tail instead of nearer the heli body.
I re-glued the bearing in the correct place, fitted the shaft with the bearing in the right place and 'Hey Presto' sorted.
Hovered hands off for 30 seconds in a 15mph side wind perfectly. I can now turn the gain 'pot No.1' up well past the centre position and no heli shakes and none of the infuriating tail bob up and down.
The drive shaft must have been setting up a resonance which was upsetting the BeastX.
Thanks to everyone who offered advice in the original post. Hopefully a similar problem will be easilly sorted for anyone else in a similar position.
Cheers
Malcolm
The heli was not built by me, which is not an excuse but is a moral to always check.
After lots of trials and errors, I took the tail and boom off and found the drive shaft bearing in the wrong position on the shaft and the shaft inserted with the bearing nearer the tail instead of nearer the heli body.
I re-glued the bearing in the correct place, fitted the shaft with the bearing in the right place and 'Hey Presto' sorted.
Hovered hands off for 30 seconds in a 15mph side wind perfectly. I can now turn the gain 'pot No.1' up well past the centre position and no heli shakes and none of the infuriating tail bob up and down.
The drive shaft must have been setting up a resonance which was upsetting the BeastX.
Thanks to everyone who offered advice in the original post. Hopefully a similar problem will be easilly sorted for anyone else in a similar position.
Cheers
Malcolm
