Waiting on 300S to arrive and have a question. How many servos are required for this plane with a BME 50 installed? Never had gas before and have not ordered engine. Do you install two servos for the rudder? Besides the throttle servo for the gasser are other servos needed for this engine? Also , if I use two rudder servos do I install them in the rear to balance this plane with the BME 50? Thanks Russ