What causes the tail to wag during fast forward clockwise circuits?

The tail is hunting noticeably at about 10-20 wags per second.

This only happens on clockwise circuits, anticlockwise (counter-clockwise) flys fine.

I have a stretch boom, a speedup pulley and longer tail blades, but no idea why this happens.

Clockwise upright, the tail is pulling harder against the torque. Sounds like a tail tuning issue. Did you try to increase Pirouette consistency? Tomáš can tell you what to do for sure.

If your tail is sped up and has longer blades you will need to reduce your overall tail gain.

What is your tail gain setting, piro consistency setting, and rudder dynamic setting?

Hi,

when Pirouette Consistency is too high it can cause such issue. The problem should be apparent also during fast forward flight.

Could you share your settings file please? I will check it.

What servo you are using?

_________________
Spirit System developer

An old post, but i've not had the heli on the bench for a while

My settings are attached.

Tail Gain is 40% (in radio), higher than this causes the tail to fast wobble in a hover.
Rudder delay is 8 (KST215mg set to 1520us/333hz/7.2v)
Rudder dynamic is 6
Ruddr revo is 0
Piro consistency is 170

It is possible rudder end-points and servo arm length are not optimal.

What are current end-point values?

Attaching your settings here will me very helpful instead of rewriting just few values.

_________________
Spirit System developer