I do not know how to use 4 servos on traditional helicopter

Hello everyone,
I am a beginner into mission planner and I seek some help. I have a triblade traditional helicopter with 4 servos and one collective (in total 5).
in the Initial setup > Mandatory Hardware > HeliSetup, I see only 3 servos and one collective.
What should I do to configure the 4th servo?
Thank You

You mean you have 4 servos for the swash plate and one for the tail ?
In that case you can

  • compile your own code or
  • you try to work with V-tail-mixers or
  • you buy a FBL-unit that supports 4-servo swash plate and works with the Pixhawk output (read all threads about Pixhawk + FBL setup before you buy the FBL-unit !)

Well thank You for the quick reply and for the tips. I will probably go for the FBL unit but I will read more about it before as you suggested. Thx

Code for 4 servo CCPM is available here: https://github.com/ArduPilot/ardupilot/pull/3245

1 Like

Thank you Fredrik for your answer. sorry for the late I have been out for a while. I will try your method

Tridge did it: Chinook heli support in ArduPilot