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HomeAircraftHelicopterMain Discussion › Servo Arm Length to Head Geometry
10-15-2012 12:37 AM  5 years agoPost 1
Ryan Maxson

rrNovice

Brookston, IN - USA

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Ok I'm looking for help /opinions on how the lenght of the servo arm effects the head geometry. Well here's the story I have a Ballistic and according to the manual, the servo ball's go out 19.5mm which is all fine when i used the Microbeast. Now that I'm trying a V-bar with everything at the 90 degrees and zero pitch. I go to set the positive and negative Collective to 12 degrees, the top is 12 and bottom is 14.5.

But also if i go set the cyclic range to 8 degrees its really low on the slider 67 instead of the 80-100 reccomendation.

I was already told to move my servo balls into 17mm and that should fix the issue.

So I looked around the forum here and haven't found exactly a good explaination why. I'm trying to understand this at this point how going in 2mm will affect the overall travel range?

Is this a Vbar thing or does it apply to all units.

Radix, Rave, Next-D, Ballistic for the Win

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10-15-2012 03:03 AM  5 years agoPost 2
Volcano

rrApprentice

chicago

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Early in the vbar your setup your collective stick at 100. Now you go back into radio endpoints for pitch and adjust it so they are equal as far as mechanical pitch on the heli. Im not sure if its necessary but id adjust one up and the other down, maybe make them both 13 degrees.
Im also not sure of this but I dont think the number you get makes any difference as long as its in the range vbar asks, and equal like youre asking about. Like if you set for 13 that will not be the maximum allowed, vbar will give as much as you ask for on agility slider I think. Correct me if im wrong on that.

On the 8 degrees setting you may need different servo arm distance, the servo arm is a lever and if you move in you get less travel, it sounds like you have too much travel now because the low #gets you 8 degrees. and also ive heard putting in "short" swash balls help the geometry, I never found the short balls tho.

Also whenever you make any changes make sure you go into the advanced setting and copy those settings to all banks after you make the changes.

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10-15-2012 07:34 PM  5 years agoPost 3
nwmtech

rrApprentice

Bellingham, WA

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episode #1 is exactly what you're after http://www.rchelination.com/index.php/diggin-in

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10-16-2012 02:19 AM  5 years agoPost 4
Ryan Maxson

rrNovice

Brookston, IN - USA

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I got the idea now. Longer arm = less gain and short arm = more gain

Radix, Rave, Next-D, Ballistic for the Win

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10-16-2012 02:31 AM  5 years agoPost 5
McKrackin

rrProfessor

Lucasville,Ohio

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Longer arm is greater mechanical gain.
Shorter arm is greater digital gain.

The digital gain is what improves the V Bar resolution.

My terminology might be off but you know what I mean.lol...

My Avant has to have the balls out 12.5mm to get the slider above 80%

They recommend the balls be even closer at something like 10-11mm.

I literally never use the word literally right.

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10-16-2012 03:22 AM  5 years agoPost 6
Ryan Maxson

rrNovice

Brookston, IN - USA

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Thanks that is useful info

Radix, Rave, Next-D, Ballistic for the Win

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10-16-2012 03:52 AM  5 years agoPost 7
Volcano

rrApprentice

chicago

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Folow the rules and get the vbar in proper ranges and youll love it. I know someone who dumped multiple vbars because it didnt work. Well he also never set the ranges properly.

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