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Rescue(normal) not horizontal
https://www.spirit-system.com/phpBB3/viewtopic.php?f=21&t=4265		 Page 1 of 1
Author:  DaKi [ Sun 06. Sep 2020 17:05:36 ]
Post subject:  Rescue(normal) not horizontal
Hi!

I have a major issue with the rescue function:
If I activate the rescue(normal) mode while hovering the heli moves up in an angle/sideways instead. I tried it several times.

Since I already read some posts about similar issues I did some tests:
1) I removed the main blades and kept the tail blades mounted. Heli was placed on the carpet.
2) I activated the rescue mode right after initialization. The swashplate moved up straight without any visible angle.
3) I started the motor. ~1900 rpm on main rotor. The vibration analysis displayed no strong vibrations (max. 45% in y-axis, see attachment). Then I stopped the motor.
4) I then activated the rescue mode again. => But then, the swashplate was strongly tilted and never levelled back.

This behavior is always reproducable. Sometimes the swash moves 2 times as it would do during a real rescue action?!, but never straight up as expected.
(Also nothing special in the log file: Sometimes 'Cyclic Ring' messages)

If there is no strong vibration, what could cause the rescue misalignment?

Thank you!

Attachments:
File comment: Vibration analysis with tail blades on
1.png
1.png [ 58.49 KiB | Viewed 565 times ]
Author:  ZeXx86 [ Mon 07. Sep 2020 12:00:56 ]
Post subject:  Re: Rescue(normal) not horizontal
Hello,

the angle could be caused by ESC fan.

Can you tell me what Spirit unit and what firmware version do you have?

Can you press CTRL+ALT+M in the Spirit Settings and write the values you see here?
Author:  DaKi [ Mon 07. Sep 2020 16:41:46 ]
Post subject:  Re: Rescue(normal) not horizontal
Hi!

Thank you for the fast response!
I have a Spirit 2 unit on a Logo 500. My ESC does not have a fan: Robbe Roxxy 9100-6
Soft.Ver. is 3.1.0.

I took several values, because the values scatter a bit.
Right after initialization i get:
-12 -10 2050
7 12 2048
While motor is running with tail blades on i get:
-4419 1191 1106
5 591 1058
After stopping the motor i get:
- 2 19 2052
-19 61 2038
Author:  ZeXx86 [ Mon 07. Sep 2020 16:54:48 ]
Post subject:  Re: Rescue(normal) not horizontal
Thank you!

Could you please enable Expert settings / Extended signal processing please?
Then restart the unit and repeat the test with rescue mode.

I hope it will help you.

Can you also let me know how the unit is mounted at the model? Is there something that is touching the unit? For example a free connector/cable.
Author:  DaKi [ Mon 07. Sep 2020 18:02:02 ]
Post subject:  Re: Rescue(normal) not horizontal
Thank you!

No, there is no cable or sth. else touching the unit, I checked it beforehand.
It seems to be better now. I'll try it while hovering tomorrow.

Additionally, I realized that I have stronger vibrations (75% on y-axis) if I attach the battery. For testing it was laying aside.
Maybe I can get the in-flight vibration log working until tomorrow to see how it looks like during flight.

One more thing I realized:
Right after initialization, if I set maximum pitch and activate rescue afterwards, the swashplate tilts to the left.
This would also explain why the heli is rescued in an angle......
Author:  DaKi [ Wed 09. Sep 2020 15:29:16 ]
Post subject:  Re: Rescue(normal) not horizontal
Hello!

I tried rescuing several times yesterday.
What should I say, it worked!
So expert settings did the trick.
(Although I still don't understand the weird swash behavior on the ground)

Again, thank you very much for your help!

Btw., do I have any disadvantages keeping this option set?
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