Extreme cyclic flutter

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ChrisHa1983
Posts: 1
Joined: Mon 25. Aug 2025 18:18:12
Location: Hessen-Germany

Godd morning. I just build up a new OMP M7 with the following setup:

SPIRIT GTR V4
Theta Razor DH1 an TH1 @ 1520us and 333hz
Azure 715 pro and 115 blades
Sunnysky 4526R
YGE Aureus 135 V2
Everything is new an checked up twice, runs smooth an freely.

When the Heli leaves the hovering position just a bit by cyclic input the rototdisc begins to shake extremely independant from headspeed and sensor sensitivity.
Blade tracking on the ground is knive sharp. Cyclic optimization is at exactly 6 degrees. It is my 4. GTR and never had those Problems. But first time theta servos in use.

I need help. Thank you
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Sepp62
Posts: 23
Joined: Sat 07. Feb 2015 22:14:51

Probably adjusting PID of the servos can help, as mentioned here (though related to VBar):

https://www.rc-heli.de/forum/technik-un ... ost5798688
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TWheli
Posts: 18
Joined: Thu 07. May 2020 9:50:45

Is that only on elevator or also on aileron?

What value is your elevator filter set ?
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