Model 863 Rotary Servo Actuator


The Model 863 is a high performance rotary servo electromechanical actuator that integrates a rare earth brushless DC motor and servo loop control electronics. The 863 servo is used for flight control, throttle control and other utility functions for UAV and aerospace programs.  These actuators are designed to operate under extreme environmental conditions and customers find them easy to implement into their systems.

This model is designed to be submersible up to 3 meters for a maximum of 3 hours, allowing it to be used on multiple applications including target drones.


  • Integrated position servo loop control with either analog or digital communications
  • Non-jamming mechanical stops
  • 4 stage spur gear train assembly
  • Corrosion protected finish output shaft, 0.5 inch SAE spline
  • Brushless permanent magnet motor design
  • High torque capacity in small volume
  • Single film position transducer
  • Digital telemetry feedback
  • Electronic stops limit input command
  • Signal interface is digital RS-485 electrical protocol
  • Consult factory for other signal interfaces
  • Thermal management option available for high altitude application
  • Water immersion to 3 meters


  • Robust structural design
  • Mechanical stops
  • Low weight to power performance
  • Customizable
Model 863 Specifications
Operating Voltage 18 to 32 VDC
Operating Temperature Range -40° to +71° C
Operating Altitude Range Up to 50,000 ft
Weight 2.0 lbm max
Mechanical Stroke ±51.5°
Electrical Stroke ±45.0° - electronically limited
No Load Speed @ 28 VDC 180° / sec, nominal

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Typical Applications

  • Unmanned air vehicles — tactical, medium long endurance and MALE / HALE vehicles
    - Control surfaces requiring servo actuation
  • Target drones — control surfaces, speed brakes
  • Utility actuation — throttle control, doors, spoilers
  • Electric aircraft, eVTOL. eSTOL, air taxis and urban air vehicles — titling mechanism, flight control, landing gear