A E T R — Ch 1-A=Roll (Aileron) Ch 2-E=Pitch (Elevator) Ch 3-T=Throttle Ch4-R=Yaw (Rudder)
Caleb from his Drone Programming Primer, Drone Basics and Flight Jargon 02:13
E A T R—Ch 1-E Ch 2-A Ch 3-T Ch 4-R
The correct order are the Ardupilot assignments.
Comments, complaints or criticisms welcome. Tell me how I’m wrong if you so believe I am.