I have a new Futaba 6EX-2.4ghz transmitter I am trying to mix dual elevators with so they move exactly the same. One servo is plugged into channel 2, the other is plugged into channel 5 (which has a switch designated for landing gear). I am able to mix the channels partially, but it doesn't seem to want to work properly. I can mix it so deflection in one direction works as it is supposed to, but deflection in the opposite direction doesn't move the mixed in channel at all. I have a feeling this has something to do with this channel being designated for landing gear normally.

I can't use channel 6 because I have both aileron servos plugged into 1 and 6 (the only way they can be set up for flaperons). Is it feasible to use a Y plug on the dual elevators instead of channel mixing? With Y cables, can I be certain the servos are moving the exact same? Where can I find a Y cable that moves servos the proper way for two elevator servos (facing oppsite directions)

Any help is greatly appreciated!

If the two fuselage elevator servos are mounted roughly in line with the elevator horns simply runing the pushrod on one side to the servo output arm below the servo and mounting the pushrod on the output arm on the opposite side above the servo will eliminate the need for either a reversed servo or a reversing (Y) cord.

John

Unfortunately that isn't an option for me, as the servos are mounted on opposite sides of the plane with a hole cut in each side of the plane so the servo arm can actually stick out each side of the plane. That's a different way to look at it, and in the future, I'll consider that option, as I hadn't thought of that myself.

You should be able to get into your settings and:

PMIX1 - on (tells the computer you want to use a user 'p'rogrammed 'mix'
MAS - CH1 (sets the master channel to ch.1) or is it 2 for your radio - used to have it but I forget - my Airtronics has ch 1 for elevator
SLV - CH5 (Slaves channel 5 to master (1) )
PMIX - +/- 100 (this should 'reverse' the servo if need be using positive or negative)
SW - ON (means you don't need to activate the mix - it's always on).

You can use a 'Y' harness, and for general sport flying it should work fine. Like said above, if one servo is going the wrong way, have the control arms come to the top of one servo and the bottom of the other.

Having one arm up and the other down gives unequal up and down travel between the two halves.
Both arms must be pointing in the same direction.
Each servo must move the same, so one channel must be reversed electrically at the transmitter, or with a reversing Y-harness.

If the servo is positioned carefully on the sides of the fuse so the control horn is centered level with the servo then there is no differential or uneven travel introduced when top and bottom output arms are used.

Of couse we have no idea of how these servos have been cobbled in on this modified airplane.


John

Sketches omitted from my previous message..

thanks for the help... instead of mixing the channels in the radio (which isn't possible with channels 2 and 5 with my radio, I am going to reverse one servo with the Futaba SR-10 and just go into one channel with both. Thanks again!

JR Matchbox will fix all your problems (and it will work on your Futaba). Provides control over up to 4 servos and you can easily set & adjust mid point, endpoint, direction, etc for each one running off just one channel, no channel mixing needed on your Tx.