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HelicopterRadio - Mikado VBAR Control System › How to center servos while bulding a heli with Vbar NEO/Control?
04-30-2018 03:52 PM  22 days agoPost 1
HawkNoob

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Pa

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Hi all, this is my first time around with the Vbar NEO. What is the proper way to center the servos while building a heli when using the NEO/Vbar Control radio before the actual setup after the heli is built?
Thanks!

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04-30-2018 04:40 PM  22 days agoPost 2
rcflyerheli

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Granbury, TX USA

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This is a direct copy of my answer from your post on the other board.

I do the servo centering before I actually install them. I have an accurate gauge that I use to insure they are exactly 90 degrees to the servo axis. It is easier for me to play with spline orientations when I can get to the servos to index the arms. When you are setting the center position, get it centered, and then check your trim numbers. If they are more than 40, then re-index your output arm and recenter. Sometimes, you might even have to change arms to get good numbers.

I always put a dot of paint from an artist paint pen on the plug of each one, ie, 1 dot for servo 1, two dots for servo 2 and 3 dots for servo 3. That way I know which channel to plug the wires into after I get them mounted.

Also since you are doing the setup i\with a Vcontrol TX, don't use the basic servo trim function in the main rotor setup. Scroll down to Expert, and use the Servo Center Trim, otherwise you might end up using enough trim to run a servo out of its allowable center range of +/- 40., and the basic trim function will move all the swash servos, as it is basically a swash trim, not a servo center trim.

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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05-01-2018 12:26 AM  22 days agoPost 3
cdrking

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Seattle

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Just curious, where does the +/- 40 number come from? Does it come from the NEO manual?

To hover is divine, the alternative is rather PLANE.

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05-01-2018 02:06 AM  22 days agoPost 4
rcflyerheli

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Granbury, TX USA

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That is per Ron at Mikado. If the center trim numbers are more than 40, it messes up the servo travel at the ends and the servo loses power. Ideally, the servo should be centered with 0 trim, but unless you are running something like the JR clamp on output arms, you can rarely find a spline orientation that will allow a 0 trim value.

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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05-01-2018 02:17 AM  22 days agoPost 5
rcflyerheli

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Granbury, TX USA

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Here is a screen shot of the 5.3 trim page on the legacy Vbar setup. Apparently it has carried over through to the Vcontrol and Neo, however on the Neo software trim page, that limit is not specified.

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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05-01-2018 03:31 PM  21 days agoPost 6
Pistol Pete

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Seffner, FL

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rcflyerheli
If the center trim numbers are more than 40, it messes up the servo travel at the ends and the servo loses power.
Whenever you "shift" center by any amount, you also have changed the equal amount of travel per side.

On the other hand, servos torque, which is always measured from one inch from horn screw is not affected, regardless of end point travel.

If you are subtrimming as much as 40, something is mechanically off.

Some radios allow you change the trim "step" travel.

~~Enjoying the hobby one flight at a time~~

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05-01-2018 05:34 PM  21 days agoPost 7
VinceY

rrApprentice

Newnan GA

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The carbon fiber control arms that bolt onto stock plastic servo arms can also be set with zero subtrim. Or very close.

Team Synergy/ Rail Blades

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05-01-2018 06:13 PM  21 days agoPost 8
rcflyerheli

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Granbury, TX USA

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I have found that with single arm servo outputs, (Futaba 25 spline gears), the numbers will range from 9 or 10, up to around 30. I can't make a blanket statement that they will be nearly 0.

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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HelicopterRadio - Mikado VBAR Control System › How to center servos while bulding a heli with Vbar NEO/Control?
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