I built a tricopter based on the titan frame, APM2.6, TGY-390DHM servo.
First, the servo was the correct direction when using the controller but the APM corrected the wrong way, causing it to spin.
Not reading the directions, i then reversed RC4, and then the APM held yaw properly, but the controller was now reversed. so i reversed the controller and everything now works.
So i had to rev RC4 and rev channel 4 on my TX.
The question came up when i read the directions and it states to reverse RC7. Why is that? i know the servo is connected to output 7, but i thought RCx were the input channels?
Did i fix it the improper way? If i rev RC7 will that not mess with channel 7 options? Why did i need to rev rc4 and channel 4 on my tx to fix the servo operation?