Detailed Specifications

Control System: +Pulse Width Control 1500usec Neutral
Required Pulse: 3-5 Volt Peak to Peak Square Wave
Operating Voltage: 4.8-6.0 Volts
Operating Temperature Range: -20 to +60 Degree C
Operating Speed (4.8V): 1.68sec/360 at no load
Operating Speed (6.0V): 1.4sec/360 at no load
Stall Torque (4.8V): 152.75 oz/in. (
Stall Torque (6.0V): 183 oz/in. (
Operating Angle: 630 Deg. one side pulse traveling 400usec
Continuous Rotation Modifiable: Yes
Direction: Clockwise/Pulse Traveling 1500 to 1900usec
Current Drain (4.8V): 8mA/idle and 230mA no load operating
Current Drain (6.0V): 8.7mA/idle and 285mA no load operating
Dead Band Width: 8usec
Motor Type: 3 Pole Ferrite
Potentiometer Drive: Indirect Drive
Bearing Type: 1 Bearing and 1 Oilite Bushing
Gear Type: All Karbonite Gear
Connector Wire Length: 11.81" (300mm)
Dimensions: 2.32" x 1.14"x 1.96" (59 x 29 x 50mm)
Weight: 3.88 oz.. (110g)

Precautions: The drum on this winch usually rotates between 2 and 4 turns depending on the model of transmitter or controller used. When used with a Hitec brand transmitter it will rotate 3.5 turns proportionally.

Each HS-785HB servo includes a two section drum with spools that are 38mm (1.50in) in diameter. Each turn of this drum will wind about 120mm (4.75in) of string. With an effective radius of 19mm (0.75in) the force available with these spools exceeds 5.67Kg (200 oz.)

Heavy Duty Karbonite gears maintain tight tolerances even after thousands of cycles.










This HS-785HB sail winch is a super duty servo with many advanced features that provide performance and reliability. Incorporated in this servo are precise heavy duty Karbonite gears for accurate positioning and minimal backlash as well as an integrated circuit that provides strong standing torque and stability. A ball bearing is at the top of the case to take the brunt of side loads and an oilite bearing at the bottom surrounding the potentiometer pin.


 183 oz-in.


 1.40 sec/360

C1 Hitec Spline2

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Uses C1 Standard Spline

General Servo Information

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180 rotation

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Continuous Rotation
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This servo is used in our 785 Gear Rack Kit!


What’s special about this servo?

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ServoCity® is a registered trademark of Robotzone, LLC.

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HS-785HB 3.5 Rotations
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