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Mikado V-BAR Mikado V-Stabi/V-BAR Flybarless System Software and Hardware Support


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Old 05-01-2019, 07:49 PM   #1 (permalink)
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Default Stationary Pirouetting

When I'm hovering, if I start a stationary pirouetting the helicopter starts to lean in some direction rapidly. What can cause that?

It's a mini vbar on a trex 470LT!

Swashplate is flat and CG is perfect, what else could be?
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Old 05-01-2019, 10:03 PM   #2 (permalink)
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The Vbar normally has no problems with pirouetting in any direction, stationary or in flight. Which direction are you doing the pirouette and which direction is the helicopter moving?
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Old 05-02-2019, 02:26 AM   #3 (permalink)
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Quote:
Originally Posted by nivaldin View Post
When I'm hovering, if I start a stationary pirouetting the helicopter starts to lean in some direction rapidly. What can cause that?

It's a mini vbar on a trex 470LT!

Swashplate is flat and CG is perfect, what else could be?
I had this same problem first before. Turns out I missed that with the Vbar connected to the PC, that when I move the rudder stick left the live display in the software showed right. And when I move the stick right it showed left. To fix this I had reverse both the tail servo tail tab in the software and the rudder channel in my radio. I also had to select a different sensor mounting then re-select the correct mounting for the sensor. Once this was done all pirouetting drift went away!!!!
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Old 05-02-2019, 05:48 AM   #4 (permalink)
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The Vbar normally has no problems with pirouetting in any direction, stationary or in flight. Which direction are you doing the pirouette and which direction is the helicopter moving?
I'm pirouetting anti-clockwise, and the helicopter always lean to the left most of times, sometimes to the backward and sometimes to the front.
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Old 05-02-2019, 09:14 AM   #5 (permalink)
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Check and fix geometry and COG, and then do an autotrim flight.
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Old 05-02-2019, 09:19 AM   #6 (permalink)
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Check and fix geometry and COG, and then do an autotrim flight.
As said before, CG is perfect.

Could you specify this geometry?
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Old 05-02-2019, 09:24 AM   #7 (permalink)
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That your swash is centered in the throw range at 0 degrees, that your control links are all the same length, equal throw in both directions, ranges set correctly in FBL. Vstabi is usually very good at telling you something is wrong, and works very well when nothing is.

After checking all of that, the trim flight will help too.
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Old 05-02-2019, 09:27 AM   #8 (permalink)
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Originally Posted by K2Freak View Post
That your swash is centered in the throw range at 0 degrees, that your control links are all the same length, equal throw in both directions, ranges set correctly in FBL. Vstabi is usually very good at telling you something is wrong, and works very well when nothing is.

After checking all of that, the trim flight will help too.
Nice, I'll check all of that and do the trim flight too.
Thank you
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Old 05-02-2019, 02:00 PM   #9 (permalink)
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Quote:
Originally Posted by PREACHERB68 View Post
I had this same problem first before. Turns out I missed that with the Vbar connected to the PC, that when I move the rudder stick left the live display in the software showed right. And when I move the stick right it showed left. To fix this I had reverse both the tail servo tail tab in the software and the rudder channel in my radio. I also had to select a different sensor mounting then re-select the correct mounting for the sensor. Once this was done all pirouetting drift went away!!!!
My inputs in vbar are correct... right is right, left is left.
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Old 05-02-2019, 03:17 PM   #10 (permalink)
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Quote:
My inputs in vbar are correct... right is right, left is left.
I think under most circumstances this issue (had it existed) would have been manifest quite dramatically...
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Old 05-03-2019, 05:45 AM   #11 (permalink)
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The auto trim does the magic.
Thank you all!


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