Model 863 Rotary Actuator

ROTARY SERVO ACTUATORModel 863 Rotary Servo ActuatorThe Model 863 rotary servo actuators utilize brushless DC motors as the prime mover within our design. The available motor technology include use of neodymium magnets. The Model 863 servo is used for surface positioning, throttle control and other utility functions on several UAV and aerospace programs. These actuators are designed to operate under extreme environmental conditions and have been chosen to support new development programs, as well as program requirements.

Our Model 863 is one of our most versatile actuator designs primarily due to the ease of integration with several interface technologies. This baseline unit is very well suited for a variety of applications and is not limited to UAV and target programs.

For more information about how the model 863 rotary actuator can be tailored to fit your specific application, contact our applications engineers.


  • Non-jamming mechanical stops
  • 4 stage spur gear train assembly
  • Corrosion protected finish output shaft, 1/2 inch 
    SAE spline, consult factory for custom shafts
  • Brushless 4 pole PMDC motor
  • 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 4 meters


  • Robust structural design
  • Mechanical stops
  • Low weight to power performance
  • Customization available
  • Inventory available


Model 863 Specifications
Operating Range 22 - 32 VDC
Typical Voltage 28 VDC
No Load Current 60 mA
Stall Torque 320 lbin
Continuous Holding Torque 150 lbin
No Load Speed 180° / sec
Unpowered Backdrive Torque Less than 60 ozin
Power Point 210 lbin @ 120° / sec
Mechanical Travel(s) ±51.5, ±1.5°
Mechanical Backlash Less than 22 arcmin with 7 lbin reversing torque
Electrical Travel(s) ±45, ±0.25°
Stall Current 3.1 amps
Frequency Response Greater than 10 Hz
Electromechanical Stiffness 150 lbin / °
Command Response Latency 13 msec
Loss of Communication Return to null position
Weight 1.80 lbs
Operating Temp -40°C to +70°C
Storage Temp -54°C to +85°C
Altitude / Temp 0 ft to 65,000 ft MSL / -40°C to 60°C
Vibration 20 - 2000 Hz, 11.5 g’s rms, random
Operational Shock 20 G’s
Water Immersion 4 meters for 3 hours

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Typical Applications

  • Unmanned air vehicles - tactical, medium long endurance and UCAV vehicles
    - Control surfaces requiring servo actuation
  • Target drones - surface control, speed brakes
  • Utility actuation - throttle control, doors, spoilers
  • Helicopter - manned or unmanned
    - Swash plate or flap control