? For some servos, such as Futaba servo models 9241, 9251, 9253, 9254, 9255, 9256, and other digital servos that are not capable of handling 6V, please connect a 5.1V step-down voltage regulator to the rudder servo, or connect it between BEC (ex. RCE-B6X) and the receiver for all servos. With this step down voltage regulator, damage to the servos can be avoided when a higher voltage system is used.