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Strage giro kick giving left rudder - HELP

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  • Strage giro kick giving left rudder - HELP

    Hi all, after two year flying with my Trex600E I decided to put it into a marvellous Century UK fuselage.
    Standard Align 75A esc, eXperience 401 giro + Savox digital servo (125..).
    No probs in the last 2 years with this configuration ; now, in the fuselage, often during final part of the flight, a strange giro kick appears while giving left rudder to turn left the hely.
    Nothing happens while hovering or flying straight ... It's not something that happens every time bit sometimes and I've noticed that - when appears - it appears during final part of flight and while rotating left the hely ... You can even ear the aerodinamic noise generated by that strange kick ...
    It's not nice to be seen and also it induce a dangerous rotation to the hely (even if not very strong in term of heading change)...

    No vibrations observed. No plays in the tail mech. and command too.

    Always flown with this configuration (but not in a fuselage) for the last 2 years without noticing that problem ... Even if I have to confess It's always been there but a extremely reduced degree and almost not noticeable.

    Maybe at the end of battery rotor speed is of course less than in the beginning ... And so tail authority could induce that strange kick while giving leftr rudder command ?

    Any help is extremely appreciated.

    All the best and happy flying,
    Denis Ferrari
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