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Model oscillates in elevator and aileron axes with Spirit GT
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Author:  weixelgeist [ Tue 10. Aug 2021 14:12:43 ]
Post subject:  Model oscillates in elevator and aileron axes with Spirit GT
Today maiden with my new Logo 550 SE with Spirit GT 3.3.2
With the initial cyclic gain setting 55 the model oscillates in both axes heavily. I turned cyclic gain down to 20. Now it is better, but oscillating persists.
What can I do?
Author:  weixelgeist [ Tue 10. Aug 2021 16:43:57 ]
Post subject:  Re: Model oscillates in elevator and aileron axes with Spiri
Could it be the reason is a to high servo frequency setting?
Author:  ZeXx86 [ Tue 10. Aug 2021 21:39:20 ]
Post subject:  Re: Model oscillates in elevator and aileron axes with Spiri
Hello,

it seems that your Geometry 6° value is way too high. Probably basic settings was not OK. Then incorrect value for Geometry can appear.

Can you let me know what value was configured?

You can share your settings file, this would be helpful.

Cyclic Gain should not be reason for this. It should not oscillate even with very high gain.
Author:  weixelgeist [ Wed 11. Aug 2021 7:18:10 ]
Post subject:  Re: Model oscillates in elevator and aileron axes with Spiri
The Value is 150
Here is the file

Attachments:
Logo 550 SE Bank0.4ds [255 Bytes]
Downloaded 27 times
Author:  ZeXx86 [ Wed 11. Aug 2021 8:00:32 ]
Post subject:  Re: Model oscillates in elevator and aileron axes with Spiri
That is very high value. For Logo 550 value is usually around 100-120.

For this reason I recommend to check Subtrims.
Please tick Servos/Subtrim (tuning). Then verify that all servo arms are in the middle and that there is zero pitch between main blades.

Is this correct?
Author:  weixelgeist [ Wed 11. Aug 2021 8:45:54 ]
Post subject:  Re: Model oscillates in elevator and aileron axes with Spiri
I am on the field now. I will check it at home.
Now I have the value of 70.
With 70 it works fine.
Author:  ZeXx86 [ Wed 11. Aug 2021 8:49:30 ]
Post subject:  Re: Model oscillates in elevator and aileron axes with Spiri
It is recommended to measure it precisely, because it has very, very big impact on overall flight performance and behavior.
Author:  weixelgeist [ Wed 11. Aug 2021 16:35:22 ]
Post subject:  Re: Model oscillates in elevator and aileron axes with Spiri
ZeXx86 wrote:
That is very high value. For Logo 550 value is usually around 100-120.

For this reason I recommend to check Subtrims.
Please tick Servos/Subtrim (tuning). Then verify that all servo arms are in the middle and that there is zero pitch between main blades.

Is this correct?


I checked it, I have had -2,5 degrees pitch.
I corrected this, now 6° Geometry is at 130.
Author:  weixelgeist [ Thu 12. Aug 2021 9:43:33 ]
Post subject:  Re: Model oscillates in elevator and aileron axes with Spiri
Today I testet the new settings but oscillating keeps on.
Is this a problem of the Spirit GT?
One year ago I had another Logo 550SE with the Spirit Pro and there was no oscillating problem even with the standard settings.
Author:  ZeXx86 [ Thu 12. Aug 2021 9:50:02 ]
Post subject:  Re: Model oscillates in elevator and aileron axes with Spiri
Value for Geometry 6° is still looking very high.

Is the model after crash or was it flying perfectly previously?
Is RPM low or normal flying RPM for such helicopter?
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