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Servo throw settings

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Peter Russell 305/08/2015 09:47:22
8 forum posts

Im using a Turnigy 9XR Pro Transmitter and am very new to this.

Is there a setting for limiting the travel of a servo in each direction?

Martyn K05/08/2015 09:50:48
5087 forum posts
3681 photos

Almost certainly yes. Look for Dual Rate settings

This may help


bouncebounce crunch05/08/2015 10:04:05
1739 forum posts
212 photos

G'day Peter,

firstly what are you trying to achieve? is it something that might be better done mechanically or something like throttle which can be more fiddly?

Ultymate05/08/2015 10:05:22
1703 forum posts
62 photos

It's not dual rates you want it will be either ATV (adjustable travel volume) or EPA (end point adjustment)

bert baker05/08/2015 10:21:57
1613 forum posts
332 photos

There is a review on rc.modelreveiws.

At 9.5 on the time bar just below the picture is what you need it is called limits


I would Centre all servos and move the arms first, it will help with long term setup of the plane,plus it is possible to run out of actual mechanical internal servo movement

Edited By bert baker on 05/08/2015 10:24:43

Peter Russell 306/08/2015 22:07:32
8 forum posts

Hi all

Another Problem?

The Aerolon movements are in the ratio of 2-1 ie 12 mm and 24 mm as they are connected by a Y lead only one signal is available.

If Im setting servo travel electronically on the transmitter it cant be done - one servo can be set to 12 mm one way and 24 mm the other but as there is a y lead connecting them and they are mechanically set to operqate in a mirror fashion.

The rudder is ok as its 60 mm both ways and the elevators operate together in tandem so they are not a problem.

Is it better or possible to use two channels for the Aerilons one for each and make them operate as a parallel pair

Hope ive put this in a way others can understand.

PatMc06/08/2015 22:11:04
4433 forum posts
538 photos

If your wanting to use the Tx to program differential ailerons they need to be on different channels.

Dave Hopkin06/08/2015 22:15:48
3672 forum posts
294 photos

Aileron differential can be achieved mechanically by canting the control horn away from 90 degrees with respect to the hinge - but its far easier to have each aileron on a different channel and change the throw angles on the TX

bert baker06/08/2015 22:18:07
1613 forum posts
332 photos

Yes it should be ok , I am not familiar with the radio but most modern do allow it .

Could be differential or flaperon. is there not a manual for the radio

Peter Russell 306/08/2015 22:41:42
8 forum posts

Is this inexprience or naivity?

Jocasta is supposed to be a trainer therefore to me = simple - issues like this make me think or am I over thinking it.? and coming up with the wrong questions.

Simon Chaddock06/08/2015 23:11:14
5736 forum posts
3034 photos


Using a channel for each aileron servo is quite common and is in many ways preferable as with a modern 'computer' transmitter you can adjust the centre position and travel limits independently. Furthermore most Tx will include a 'differential' option that allows you to set the servos so they travel more up than down.

Then there is the option to adjust the way the servos behave relative to the movement of the Tx sticks, Around the centre position the servo move less than the corresponding stick movement but move more towards the limit. Its called exponential travel or expo for short.

Of course almost anything that can be done by electronically programming the TX can also be achieved mechanically by altering the servo linkage but it can be difficult and time consuming to set up.

Your Turnigy 9x pro will be able to do everything you need but you have to read the manual to find out exactly how to do it.

I hope this helps..

Edited By Simon Chaddock on 06/08/2015 23:11:54

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