I have the controller (AX2550) and motors. Now I want to control them using (for openers) a R/C unit. Can you suggest one with 3 or more channels and a joystick? I've seen (in the literature) JR Quattro and Futaba 4YF but don't know if they provide the best match, or if others are better suited to the AX2550.
The controller will work with any common RC radio. However the connectors are shaped to fit Futaba radios. The model you identified would work fine. Beware that you use a radio with frequencies for RC cars (not RC planes).