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HomeAircraftHelicopterThunder TigerRAPTOR 50 › x50 servo set up?
10-27-2011 07:45 AM  6 years agoPost 1
slayer

rrApprentice

las vegas n.v

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folks help I see that in the manual it show's that elevator and pitch servo horns have to be off set form center but the cyclic is to be center that would cuse too much throw from 2 servo's and not from one wich would cuse bing or servo's fighting each other.I did it like the way it show's in the manual and it dose seem to do that what am I missing here.

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10-27-2011 03:09 PM  6 years agoPost 2
Gary H

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Minnesota USA

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Is your swash set up for 120 degrees?

GH

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10-27-2011 03:56 PM  6 years agoPost 3
gwright

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Champaign Il

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I don't have a manual,.. so I can't comment on what it states, however, the X50-E prototype that I'm flying has the same control system and each of the three bellcranks has a spacing of 23mm between balls, and they have no offset,...i.e. the balls are straight in line with the center pivot screw. This means for zero binding and perfect push/pull you need servo arms with a straight-across 23mm spacing. I used the large futaba wheels that are not drilled in order to place the holes exactly at 11.5mm from center and exactly where they need to be without using subtrims. Since the three bellcranks are straight across (no offset on the balls) it actually makes setup quite easy as you simply setup two parralellograms. Adjust the push/pull rods to exactly the length between the servo arm screw and the bellcrank pivot. They should both be the same length. turn on the radio and center everything including collective of course, and drill the holes in the servo arm so the pushrods are at the correct 90 degree angle and the holes are 11.5mm out from center. I actually had a jig of 1/16" plywood laser cut for the purpose. It's fairly simple, I'm just really anal about control system geometries <G>.

Gary Wright

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10-27-2011 04:21 PM  6 years agoPost 4
gwright

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Champaign Il

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Attached are three images, one shows the pushrods being adjust to the exact length they should be (servo arm screw to bellcrank screw), one shows the laser cut jig in use, and another is a jpg of the drill jig laser cut file, plus one modified showing the pushrod runs. It could easily be cut out of thin cardboard like a piece of posterboard or a piece of one of your wife's cereal boxes <G> (yes,.. I've done that many times to make templates and she always wonders why the cereals are simply in the pantry in their plastic bags without a box). I put the measurement on there to remind you to play with printing it to scale till you hit 23mm between the two holes. Since it's hard to measure and be precise to the center of a hole, I also put a little 1 inch long scale at the bottom

Gary Wright

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