If your collective is assymetrical, that means your servo arms are not at 90 perfectly!
Im also using the soko tool, great stuff
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| Cyclic setup question https://www.spirit-system.com/phpBB3/viewtopic.php?f=20&t=2066 |
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| Author: | Necroscope [ Thu 22. Jun 2017 6:50:50 ] |
| Post subject: | Cyclic setup question |
I have been going through my helis setup with my Soko setup tool. I have my servos set at exactly 90 degrees and zero degrees at mid stick. My collective is +9.8 deg and -9.5 deg. But my cyclic is +8.8 deg and -13.5 deg. How can I adjust the cyclic so that it is even in both directions? Is it possable to give the ability to adjust the pos and neg cyclic in a later sofware update? |
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| Author: | Gtamas [ Thu 22. Jun 2017 7:38:17 ] |
| Post subject: | Re: Cyclic setup question |
If your collective is assymetrical, that means your servo arms are not at 90 perfectly! Im also using the soko tool, great stuff
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| Author: | ZeXx86 [ Thu 22. Jun 2017 7:39:51 ] |
| Post subject: | Re: Cyclic setup question |
Necroscope: You can fix it in the Servos/Servo Travel Correction. So it is already there and you can even adjust each servo separately. But if your servo arms are not in the center while Subtrim (tuning) is enabled, then this is the real reason for such difference. At this time everything should be in the center position (0° between main blades). |
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| Author: | lostmyheli [ Thu 22. Jun 2017 13:19:11 ] |
| Post subject: | Re: Cyclic setup question |
I thought servo travel correction was to be used to get a level swash at max positive and negative collective ? Not to be used to correct unequal cyclic pitch. I have the same issue collective is =/- 11.9 but cyclic is 10 and 13. I use Soko also. |
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| Author: | Coco66 [ Thu 22. Jun 2017 22:17:42 ] |
| Post subject: | Re: Cyclic setup question |
Not sure about Soko, but with a standard pitch gauge it is very easy to get wrong going from right to left aileron while measuring - a little displacement of the head will give a significative difference. That said, if you move all three servos the same in the travel correction you will most likely fix your problem. It's clear what the feature does, use it as you wish... |
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| Author: | lostmyheli [ Thu 22. Jun 2017 22:33:15 ] |
| Post subject: | Re: Cyclic setup question |
Cocco, If you read the explanation in the manual for servo travel correction its used to achieve level swash at max positive and negative pitch and correct for asymmetrical collective. Does not state anything about being used for asymmetrical cyclic pitch. |
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| Author: | Coco66 [ Thu 22. Jun 2017 22:46:24 ] |
| Post subject: | Re: Cyclic setup question |
That's exactly what I mean... think at what it does, and use it as you want. Was initially meant for level swash, but as a "side effect" it can be used to change max or min cyclic without impacting collective - if the three sliders are moved the same. |
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| Author: | lostmyheli [ Thu 22. Jun 2017 23:34:58 ] |
| Post subject: | Re: Cyclic setup question |
Cocco, I tried as you suggested by moving all three sliders the same amount. It has no affect on cyclic only collective. |
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| Author: | Coco66 [ Fri 23. Jun 2017 6:55:41 ] |
| Post subject: | Re: Cyclic setup question |
Well, let me try it later today, I was sure that (a) that's what Tomáš suggested and (b) I used it for that in the past. But I could of course be wrong. |
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| Author: | ZeXx86 [ Fri 23. Jun 2017 7:01:05 ] |
| Post subject: | Re: Cyclic setup question |
When moving all sliders, it will affect only collective pitch, but not cyclic pitch. It will be caused rather just by 1 or 2 servos. The real reason is that some push rod is not perpendicular (usually problem with e.g. Logo - elevator). Unfortunately in some cases it can't be fixed mechanically. |
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