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HomeAircraftHelicopterRadio - Mikado VBAR Control System › Main Rotor menu - subtrim
11-14-2014 01:35 AM  3 years agoPost 1
buster1

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Manhattan, NY

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Question: when using the subtrim section of the main rotor setup section to trim the servo horns to 90 degrees - after I trim it out and then come out of that menu - the servo's then move slightly off center.

What other setting do I have that's screwing things up?

Any suggestions would be great.

Thanks,
Jeff

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11-14-2014 02:16 AM  3 years agoPost 2
Retired2011

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Lee's Summit, MO

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Your heli is not perfectly level on the workbench?

Are you sure you don't have any trim in the TX?

I know mine always twitch coming out, but have never paid attention to where they go...flys just fine.

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11-14-2014 02:47 AM  3 years agoPost 3
buster1

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Manhattan, NY

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The only trim I have in the transmitter are the trims I'm adjusting to get the servo horns centered to 90 degrees. It's a TDR, so it is angled forward somewhat - but if that was causing it, I'd never be able to get it set up right.

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11-14-2014 02:48 AM  3 years agoPost 4
buster1

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Manhattan, NY

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Forgot to ask - where else could their be Trim (no pun intended) setup in the TX?

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11-14-2014 03:27 AM  3 years agoPost 5
buster1

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Manhattan, NY

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Infigured it out - it was the swashplate trim in the expert menu - I was able to adjust it out in there - I must messed with them at some point.

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11-14-2014 11:47 AM  3 years agoPost 6
Retired2011

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Lee's Summit, MO

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You don't adjust trims in the TX to center the servos...you do it in the Vbar software with all TX trims zeroed.

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11-14-2014 11:52 AM  3 years agoPost 7
Retired2011

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Lee's Summit, MO

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It's a TDR, so it is angled forward somewhat - but if that was causing it, I'd never be able to get it set up right.
It's not necessary for the heli to be level, as long as your setup procedure is based on everything being orthogonal to the main shaft...I was only pointing out that it could be why you saw a change when you came out of setup to real world conditions.

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11-14-2014 01:03 PM  3 years agoPost 8
buster1

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Manhattan, NY

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Chet:
I did adjust in the Vbar software.
What I found is that the auto trim had setting's that was affecting my setup. I was resetting The swashplate trim from an initial setup when I received the Vbar control and it seems the old settings in the auto trim was moving the Swash when I came out of the main rotor setup. When I cleared auto trim, the issue went away. When I test fly again, I'll redo the auto - trim. I think what I've found is that you're going to reset the swash - you need to clear auto trim first and then redo after the mechanical setup is where you want it.

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11-14-2014 10:39 PM  3 years agoPost 9
eddiscus

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Dumont, NJ-USA

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If i remember correctly when you are in the subtrim (swash level mode) it puts the servo output signals to mid travel and ignores the transmitter inputs and sensor inputs. Once you are finished trimming the arms to 90 degrees and exit out of that step the sensor and stick inputs pecome active. This could cause your arms to twitch. As long as the arms do not continue to travel it should be ok.

If you go back to that step do the arms return to 90 degrees?

Logo Xxtreme 800
Logo 700
Citizen 142
Synergy 766
TDR 2

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11-15-2014 12:49 AM  3 years agoPost 10
Retired2011

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Lee's Summit, MO

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you need to clear auto trim first and then redo after the mechanical setup is where you want it.
OK, sounds like you have it figured out, and I learned something...
not sure I would have thought of that.

Maybe not doing a trim flight is a good thing.

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