Elevon plane configuration : issue with Servo and RCMAP

ArduPlane Plane 4.4
1

Hi,
I’m working on one of the last stage of my project before flying, configuring the servo and RC, and I’ve got some “strange” issues , I don’t understand why …

  • DART ZOHD (wing with elevons)
  • MATEK H743 Slim
  • PDB HEX powerboard
  • RC transmitter : Spektrum DXE with satellite receiver SPM4648

All cabling are in place, power is OK, I’ve done the Radio calibration in MP and Pitch + Roll are OK when I move the sticks in “RADIO CALIBRATION”
MP config: (like in the ARDUPLANE doc https://ardupilot.org/plane/docs/guide-elevon-plane.html#guide-elevon-plane)

SERVO1_FUNCTION 77
SERVO2_FUNCTION 78

RCMAP_ROLL 1
RCMAP_PITCH 2

SERVO OUTPUT menu in MP:
Position 1 function is “elevon left”
Position 2 function is “elevon right”

What happens:

  • When moving the pitch stick = on MP in “Radio calibration” menu the pitch bar is moving properly , in “SERVO OUTPUT” menu the green bars are working like a pitch.
    => but the wing servos are moving the elevon for a “roll” on the plane.

  • When moving the roll stick = on MP in “Radio calibration” menu the roll bar is moving properly, in “SERVO OUTPUT” menu the green bars are moving like a roll
    => but the wing servos are moving the elevon for a “pitch” on the plane.

I tried to modify SERVO FUNCTION and RCMAP but it doesn’t work…
Any help will be appreciated, thanks !

Nico

2

Seems you have the inputs and outputs configured correctly but likely need to reverse one of the servos to match expectation when actuated.

3

Hi Yuri,

Thanks for your answer. With “SERVOx_REVERSED” ?

4

That seems the likely course of action.

Do not ignore the safety checks mentioned in the documentation to confirm proper servo direction once you think it looks correct.

https://ardupilot.org/plane/docs/guide-elevon-plane.html

5

OK I’ll try and keep you updated
Bye
Nico

6

Hi Yuri,

It works fine now, many thanks !
It was a nightmare to have the right settings with my build, not only with the servos but with the transmitter as well… Hopefully I found some answers, but one thing not clearly explained in the doc : We don’t have to make some programmation on our transmiter as MP is managing everything ! i didn’t fint it anywhere - maybe my fault to be honest.

Bye
Nico