Aileron Issues that are no going back to centre
 

Hi Guys
Im having an issues setting up the aileron with 2 servos on my DX7S with an AR7000 RX.

It really has stumped me ive tried many ways.

You can move the aileron and it moves return the tx to centre and the aileron flap returns to centre of the wing. If you move the Tx the other way and then return the tx to centre the flaps could be up to 10mm being away from being the wing centre. All servos where set up before they where put into the wing.

When you look at the wing the servos are moving from one position but not returning to it.... Then the other way they do.
If you leave it so stick is centre and the flap is 10mm out and you subtrim each servo to the correct position... then the problem swaps so its out the other way !!


Basically my Aileron servos only go to centre one way.... If you play with the sub trim you can actually swap the fault so it goes to centre the other way!!!
This happens if I use a Y lead or set the radio up for 2 servos one pluged into aileron and the other in to aux1...


Ive binded it to another TX and it still does the same, Ive Swaped RX and everything is the same,



Anyone got any ideas!

Sounds like slop in the mechanics of the servo to aileron linkages or stiff hinges.

Are both aileron servos the same brand and same part number? You mentioned flaps I'm assuming you mean the aileron and not some flaperon mix. Have you checked to see if you have a mix set by mistake

The servos are both multiplex servos and the linkages all seem free.
Everything ive read has put a mix5 on RH to LH aileron.

you would of thought it world work on a y lead but it just doesn't return to neutral.

Jack

You say the servos are the same brand that's good but are they the same part number. What happens if you disconnect one or the other servo

If the servos are a good match this scenario is actually quite common. It often is the result of linkage setup and it goes much deeper than just "Linkages seem Free" :

Are both aileron horns positioned so the hole that used by the pushrod lined up even with the hinge line on both sides?

Are the control horns in the proper and exact same place on each side"

Are the pushrods on the aileron horns the exact same distance from the hingeline on both sides?

Are the aileron pushrods the exact same distance from the servo output bushing on both sides?

Are all pushrods completely free of all flexing, be honest and test by pushing the control aginst the servo??

Good mechanical setup and geometry is vitally important and often overlooked in the ARF age also when folks start modifying things.


John