I'm currently running a Super Sky Surfer with this setup
4 HS-82MG for ailerons and flaps
1 HS-225MG Elevator
1 HS-85MG Rudder
CC 10A bec to power ardupilot, receiver and servos
My flaps are currently connected straight to the receiver with a Y harness while all other channels are plugged into the ardupilot. I initially did this to keep manual control of the flaps, not thinking that I could still control them manually with the ardupilot in between. Is this a sound setup or would it be better to just put the flaps on the outputs? I'm asking this because I'm getting an unusually consistent servo buzz from the the flap servos (unlike the rest of the servos), even though mechanical movement is smooth and free. Could it be that the servos aren't getting enough power?