Futaba S9254 Digital Heli Rudder High-Speed Servo
This servo can produce high-current draw from your batteries. If using NiMH or LiPo batteries, make sure they are capable of delivering sufficient amps.
FEATURES:

• Coreless motor for reduced weight and high-speed response
• Digitally enhanced microprocessors cut the response time in half
• from transmitter input to servo reaction
• Dual ball bearing gear train
• Dust and water resistant-not water proof
• Nylon gears
• Black plastic case
• One year warranty

INCLUDES:
One S9254 Digital Coreless High Torque High Speed Helicopter Servo, One round servo wheel, one six arm servo horn, one four arm servo horn, four grommets, four mounting screws and four rubber mounts.
SPECS:

• Speed: 0.06 sec/60° @ 4.8V
• Torque: 47 oz-in @ 4.8V
• Dimensions: 1.6 x 0.8 x 1.4 (40 x 20 x 37mm)
• Weight: 1.7oz (49g)
• Power Supply: 4.8V (Futaba does NOT recommend using 6V)

COMMENTS: S9254 Digital Servo Precautions, It is best to avoid long leads and Y-harnesses especially with standard grade wires. If problems are encountered, consider using heavy duty wire such as Futaba's Heavy Duty Series or Hobbico's Pro Series, minimizing lead lengths, and/or removing Y-harnesses. Current Drain: This digital servo is specially designed for high-torque or high-speed, therefore very high current drain is normal at startup. For ultimate performance when using this servo please review the following points.

1. Radio systems with the Battery Fail Safe function have a higher cut-off voltage setting which will cause shorter operation time.
2. When installing the servo, please check pushrod linkage to make sure there is no binding in order to prevent excessive power consumption and decrease the life of the motor and battery.

A note on Coreless motors. A conventional servo motor has a steel core armature wrapped with wire that spins inside the magnets. In a Coreless design, the armature uses a thin wire mesh that forms a cup that spins around the outside of the magnet eliminating the heavy steel core. This design results in smoother operation and faster response time. This servo is rated as high-torque for helicopter gyro applications, the rating would not be considered high-torque for airplane control surface or monster truck steering applications.