Wiring error in PWM output of Pusher engine in Ranger-Ex VTOL PX4 configuration

Hello this is my first contribution here,
I am building a ranger VTOL with Pixhawk and PX4 V1.5.5 firmware running through qgroundcontrol v 3.1.3 and windows 10. After a week of testing , downloading firmwares, configuring airframe and modifying parameters and struggling my mind I end up with a conclusion: The document https://docs.px4.io/en/framebuild_vtol/vtol_quadplane_volantex_ranger_ex_pixhawk.html is wrong regarding the wiring of the pixhawk outputs. In this doc the Aux5 is setting for the throttle of the pusher motor, and in this configuration I can not arm my Ranger. I think the correct output for the pusher motor should be Aux3.
Please correct me if I am wrong.
I am a newbie, I don not know how to writre codes or writing a software.
Also I want to ask if I should flash the new 1.6.0 master RC, just to know if this FW has benefits for my VTOL ranger

Thank you

Hi Carlos,

If your throttle is on aux3 it seems you have the wrong airframe selected in QGC. try selecting the QuadRanger as airframe.

1.6RC will have better transitions and should be more stable and safe to fly your VTOL.

Hello Sanders,

Thank you very much for your answer.

I have been trying hard to setting up without success my quad ranger VTOL. Today I have flashed the stable 1.5.5 firmware again, selected the right airframe (quadranger VTOL, I have done the gyro, compass, accelerometers, airspeed sensor, rc calibration succesfully, flying modes, power and battery calibration, but no luck at all trying to make the pusher engine to work in my bird.

So far the 4 quad (Main outputs 1 to 4) engines run perfectly in the quad mode but if I am in the fixed wing mode I can control L and R ailerons (aux 1 and 2), elevator (aux3) and rudder (aux4) perfectly but not the pusher engine in the aux5 output (as soon I powered the pixhawk and after initialisation gps fix and arming it keeps beeping. I have tested the esc and motor conecting it directly to the receiver and performed esc calibration succesfully and run smotlhly with the throttle lever

I am starting to think that this it can be related to my RC setup, Graupner MC32 , receiver GR24 conected through SUMD, I had to swap the receiver output channels as you know Graupner output channel 1 is throttle, so in my MC32 transmitter I had to swap the receiver output channels sequence to:

servo 2—output 1
servo 3—output 2
servo 1—output 3
servo 4—output 4

I will not give up…

The pusher is disabled when the vehicle is not armed.
Also, when quadchute is active (VT_FW_MIN_ALT) it will not transition to FW on the ground

Does your GCS say anything when you try to arm in FW?


I know that pusher is disabled when vehicle is not armed, but I am able to arm it and in VTOL configuration all 4 quad motors are working. My GCS does not say anything, all sistems in green and no warnings.

How do you know the pusher isnt working? when the quad motors spin the pusher isnt supposed to spin

I know that in MC mode the pusher motor should not spin. But if I arm the ranger in FW mode and ailerons, rudder and elevator moves , the pusher motor should spin if I move the throttle stick.

hi,Carlos_Rubio,which airframe you choose?

Hello Samuel.
The airframe is quadranger VTOL

The mixer file of quadranger vtol as followed:

Mixer for an AAERT VTOL

Aileron 1 mixer

M: 1
O: 10000 10000 0 -10000 10000
S: 1 0 -7500 -7500 0 -10000 10000

Aileron 2 mixer

M: 1
O: 10000 10000 0 -10000 10000
S: 1 0 -7500 -7500 0 -10000 10000

Elevator mixer

M: 1
O: 10000 10000 0 -10000 10000
S: 1 1 10000 10000 0 -10000 10000

Rudder mixer

M: 1
O: 10000 10000 0 -10000 10000
S: 1 2 -10000 -10000 0 -10000 10000

Throttle mixer

M: 1
O: 10000 10000 0 -10000 10000
S: 1 3 0 20000 -10000 -10000 10000

according to above code ,we can know
aux pwm out channel 1---------->Aileron 1
aux pwm out channel 2---------->Aileron 2
aux pwm out channel 3---------->Elevator
aux pwm out channel 4---------->Rudder
aux pwm out channel 5---------->Throttle

you can try it.
good luck!

I apologize to everyone who tried to help me, specially Sanders. I am really sorry. At the end I managed to arm and run the pusher engine. It was an ESC calibration problem, I think it is a bit tricky to perform the 5 ESC calibration. Today I started to do my test and put two flights on it.

Again, sorry for bothering all with my doubts about the wiring error.

I will post my VTOL logs in https://gitter.im/PX4/VTOL, so if someone more experienced can help improve my VTOL ranger .

Thank you