Model 935 Rotary Actuator

Model 935 Rotary Actuator

The Model 935 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 935 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 935 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 935 rotary actuator can be tailored to fit your specific application, contact our applications engineers.


  • Non-jamming mechanical stops
  • 4 stage spur gear train assembly
  • Stainless steel output shaft, 1/2 inch SAE spline
  • Brushless 2 pole PMDC motor
  • High temperature capability
  • Analog position or digital telemetry feedback
  • Electronic stops limit input command
  • NTC thermistor in motor for temp sensing of motor windings
  • Outputs for current, velocity and temperature telemetry
  • Signal interface is digital RS-485 electrical protocol or RC PWM
  • Consult factory for other signal interfaces
  • Thermal management option available for high altitude application


  • Robust structural design
  • Mechanical stops
  • Low weight to power performance
  • Customization available
  • Inventory available
Model 935 Specifications
Operating Range 22 - 32 VDC
Typical Voltage 28 VDC
Standby Current 150 mA
Stall Torque 600 lbin
Continuous Holding Torque 150 lbin
No Load Speed 180° / sec
Unpowered Backdrive Torque Less than 80 ozin
Power Point 280 lbin @ 60° / sec
Mechanical Travel(s) ±25°, ±40, ±50° or ±95°
Mechanical Backlash Less than 36 arcmin with 10 lbin reversing torque
Electrical Travel(s) ±20°, ±35°, ±45°, ±75° or ±90°
Stall Current 6 amps
Frequency Response Greater than 5 Hz
Electromechanical Stiffness Up to 485 lbin / °
Loss of Communication For RS-485 version - holds at last position
For R/C PWM version - returns to null position
Weight 3.90 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, 8.12 g’s rms, random
Water Immersion 4 meters for 3 hours

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Typical Applications

  • Unmanned air vehicles - tactical, medium long endurance and MALE / HALE 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