Extreme wobble, when flying against wind

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lukas82
Posts: 10
Joined: Sat 01. Jul 2017 20:38:49

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...?
ZeXx86
Site Admin
Posts: 12836
Joined: Mon 29. Apr 2013 16:06:44
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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
lukas82
Posts: 10
Joined: Sat 01. Jul 2017 20:38:49

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,, 8-)
ZeXx86
Site Admin
Posts: 12836
Joined: Mon 29. Apr 2013 16:06:44
Contact:

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
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