Flying Wing Control Surface Issues

Hello,

I am working on setting up my plane for the first time, and am running into some issues that I am hoping someone can help me with.

I have been following along with the guide, and have successfully installed the software, configured my transmitter, etc. to the point where I am ready to setup the actuators. I have set it up like this:

which I believe is correct, however when I enable the sliders under “actuator testing” and move the sliders, nothing happens. The only way I can get the actuators to move is by moving the sticks on my transmitter, and that results in the wrong behavior (for example, when I command ‘pitch down’ only one of the servos moves, and it does so in the wrong direction.

For reference, am using the following hardware:

  • Flying wing with 1 motor and two elevon servos
  • Pixhawk 4
  • TaranisQ X7 transmitter
  • X8R receiver
  • QGroundControl, with the generic flying wing airframe

I have my elevons connected to 1 and 2 on the receiver, and the motor on 3. The receiver is connected to the Pixhawk using SBUS. On the transmitter, I have it configured such that channel 1 is aileron, channel 2 is elevator, channel 3 is throttle and channel 4 is rudder. I believe this configuration is correct, as the attitude controls on “Radio Setup” do behave as expected.

Any ideas how to fix this? I feel like I am missing some simple configuration step, but have been troubleshooting for a while now with no luck.

What if you select “Rev Range”, the box on the right, to invert it?

That does not seem to change anything. With (any of) them reversed, the actuator testing sliders still do nothing, and the effect of the transmitter inputs does not change e.g. moving right stick down = only right elevon down.

@ryanjAA maybe you have experience with this?

hmm, weird but likely just something in the setup.

  1. check you have the pwm hz correct. Digital servos are likely 400mhz, not 50.

  2. are you in the aux or main output port?

  3. what type of servos?