Mixing problem on a large glider with Profi TX16

[Magnus]

Hello,

I have a SB10-glider that has air-brake, 2 flaps and as usual an aileron per wing.
I have mixed so that when I move the throttle-stick, which acts as a brake on landing, only the air-brakes will start and they are fully raised when the throttle-stick is in the middle.
Just before the throttle is in the middle, the 2 flaps will gradually descend, as well as some dive compensation, to be fully down when the throttle-stick is in the bottom position.
This works well and so far so good!

The middle flap is long so there is 2 servos attached to it.
Because the 2 servos sits on different inputs in the receiver I first programmed with only one servo on the middle flap to make it easier to getting the movement right and then I copied the values to the other servo. After some small correction the 2 servos moves correctly regarding the brake.

When I then move the aileron the "first servo" on the middle flap moves in the right direction, but the second servo on the middle flap moves in the other/wrong direction!

Hope you understood what I mean!

I have of course tried to find a solution for this but not succeded.

Anyone who has an idea of how I will correct this?

Best regards

Magnus Norling
Sweden

[FrankS]

Magnus, for the Tx to know the order of the control surfaces you have to plug in the controls left/right/left/right. So for the middle flaps on each wing you would need say

left flap 1 = channel 6
right flap 1 = channel 7
Left flap 2 = channel 8
right flap 2 = channel 9

Note the channel numbers are just for example, you can use what you wish but you must go left/right/left/right... (or right/left/right/left )

[Magnus]

Thanks for your help!
I will soon test it.

[profimc]

Hi, Magnus!

The problem you created is that 2 servos are attached to one surface (here: flap) Take a v-cable and only one receiver output and there is no problem. But that is not what you realy want. You want to influence the programing of each servo for itself.
The problem is the different mixing-rates: aileron, flap and spoiler affect the flap surface. The direction of the aileron signal must change, usually only for the ailorons but also on the flaps as long as an aileron-rate is assigned to them. So you have to inclued a "2" in the mixer for aileron-rates. And of course you have to mind the oder of the receiver outputs as Frank thas already said.

with regards
profimc

[Magnus]

Hi,

I have tested it and it works fine! Thanks!

Magnus