I just bought a foam F15 from nitroplanes and want to have the elevators split like elevons to make the roll rate even faster. I have a DX7 and a AR 6100 or AR500 available for this plane. Each elevator half has it own servo. So without using a Y harness I must first mix the elevators, but how do I do that? After getting both channels to act as one, can I then mix the elevators with the ailerons? If so, how can I do it? Will the ailerons need to be on a Y harness? I would greatly appreciate any help or advice. Thanks John

John, first to have two servos on different channels on the rx you have to set up a mix where say left servo is master (channel # x), and right servo is slaved (channel #Y)

Then you would need to set two additional mixes, controlled by a switch on the tx to turn them on and off if need be.
One mix would be left aileron master, left elevator slave. Second mix would be right aileron master, right elevator slave.

The manual will explain how to do it and assign both of these mixes to a single switch. The first mix is set up with no switch, and set to be always on.

You may have to play with the mix ratios as if the elevator is too aggressive it may make it oscillate as it rolls, ditto if it's to weak. As you are going to be using four surfaces to rotate the fuse on one axis.

John, first to have two servos on different channels on the rx you have to set up a mix where say left servo is master (channel # x), and right servo is slaved (channel #Z) for the elevator.

Then you would need to set two additional mixes, controlled by a switch on the tx to turn them on and off if need be.
One mix would be left aileron master, left elevator slave. Second mix would be right aileron master, right elevator slave.

And yes you can use the ailerons on a Y harness. As the mix is referencing the tx stick positions to make the control surfaces operate, not the actual servos. And yes you could also set the ailerons on separate channels too, just like the elevator, if you had enough open channels on the rx and an additional mix availability.

The manual will explain how to do it and assign both of these mixes to a single switch. The first mix is set up with no switch, and set to be always on.

You may have to play with the mix ratios as if the elevator is too aggressive it may make it oscillate as it rolls, ditto if it's to weak. As you are going to be using four surfaces to rotate the fuse on one axis.

In thinking some more on it, might just be a little easier just increasing the throws on the ailerons on the bird, and the ATV on the tx.

More of each would give you quicker response in a roll, and would save you a lot of time trying to set up the quad control surfaces to work in harmony.

Also moving the CG back a tad will make it respond faster.

I am having the same issue/problem but with the nitro planes sr-71, spektrum dx7 and have it set up with elevon mixing but it is responding with aileron movements in either stick direction movements...up and down left or right? What am I doing wrong?

I'm not sure what your problem is, sounds like its working right? When you select elevon it mixes the aileron and elevator inputs and sends it to the 2 elevon on the trailing edge of the wing. So if you take the control stick full right and nose up(back), the right elevon should be up and the left should be near the neutral position. If you just pull back, nose up, with the stick in the neutral position both elevons should go up. Make sure you have the left elevon pluged into the aileron port on your rx, and the right should be pluged into the elevator port. Hope this helps.

Thanks for the info. I've never played with the mixes, but I should be able to figure it out after playing with it. Thanks