I have some trouble: I was trying my spirit red edition on t rex 450 pro in some wind ( something like 30 - 40 km/h). When I fly against wind heli get sometimes exteme ,left-right-left-right, oscilation; it is really bad, something like a least 30 degree on left and right side...

to low rpm...?
vibration...?
or unit is faulty, have some crash with it...?

Hello,

something similar could be caused by:
a) very soft head dampeners
b) too tight blades in the blade holders
c) incorrectly configured Geometry 6°.
d) potentially faulty servo but this will happen also with no wind.

Can you send all details about the model?
Problem with the unit is very likely not the case otherwise it would happen all the time.
Did you measured vibrations? Especially Aileron axis.

_________________
Spirit System developer

thank you for help.

I have disassemble heli and there is a few things to fix.

one blade is slightly damaged,
blades holder are not tight, 1-2mm play on feather shaft
main gear are very bad quality not perfectly round, and now stripped because of that extreme wobble

but I thing main reason is that I used to low rpm, no telemetry.

I'm used to big helis where I dont have to be so bothered with ,,details,,

You are welcome.

Normally low head speed can cause oscillations only at elevator, but not aileron.
Main Gear should be also not a problem.

I have never seen such strong oscillation, so I think that something is very bad
Did you checked all other things that I have mentioned? Can you answer my questions, please? Then I can help you more.

_________________
Spirit System developer