Futaba S9257 Digital Rudder Servo EP — Tail Servo for Gyro-Controlled Helicopters  [S9257]

Digital rudder servo optimised for helicopter gyros

The Futaba S9257 EP is a compact, high-performance digital rudder servo intended for RC helicopter gyro applications. It is designed to link with Futaba gyro units to give precise tail control when a gyro is fitted.

Per the product details, the servo ships with multiple horn choices and mounting hardware, and it uses two ball bearings on the output shaft for improved smoothness. The unit is for FM, PCM and HRS radio systems only and must not be used with AM equipment.

Fitting the servo requires connection to a compatible gyro such as the Futaba GY401 series or the GY502. After installation, perform tail linkage adjustment and endpoint tuning on your transmitter, and confirm travel limits to prevent overtravel.

Compatibility

The servo is specified for use with the Futaba gyro units listed above and for tail control in electric model helicopters. Proper operation requires connecting the servo to a compatible gyro and using an FM, PCM or HRS radio system.

In summary, the S9257 is a purpose-built rudder servo for pilots fitting Futaba gyro systems, offering a small footprint, included mounting hardware and multiple horn options for tailored tail setups.