I have several 50cc models and 1 warbird. Here's my set up... (1 servo on each ail control surface), (1 0n rudder),( 1 per elevator half)(1ea flap) (1 on throttle), 2 HD switches & 2 batteries (li-ion 2600s) with regulators to the(1) reciever. 1 2600 li-ion on ignition w HD switch & regulator. I use this up thru my 100 cc size models. The Reg on the ignition can be omitted if useing 4.8v & on some 6v ignitions. I have used a Y connector to add the second battery, and a servo to the rudder on the other side of the Y if you start running out of slots on the reciever, and it has never given me any problems, and is less expensive than buying a 12 or 14 ch reciever. This has worked for me for the last 10 or so years...Gene