Futaba S9257 
​Servo EP Heli Digital Tail Servo (Gyro)
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Description 

This is the Futaba S9257 High Speed Digital Servo for Helicopter Gyro Operation. The Futaba S9257 Digital Tail Servo combines increased torque and high speed with digital precision. Dual ball bearings make for smooth operation. The S9257 servo is designed to be used with Futaba GY240, GY401 and G190 gyros. Due to its narrow size, you will need a special full-size mounting plate to run this in a full-size frame...but you will be able to save some ounces off your setup.
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Product Specifications 

Speed:
Torque:
Length:
Width:
Height:
Weight:
Power Supply:

0.08 sec/60° @ 4.8V
20 oz-in @ 4.8V
1.4" (35.5mm)
.59" (15mm)
1.13" (28.6mm)
0.92oz (26g)
4.8V (Futaba does NOT recommend using 6V)