User's Manual
Moog Components Group • www.moog.com/components
Model 813
The Model 813 
Rotary Brushless 
Actuator is an 
antenna azimuth 
drive servo actuator 
used for airborne radar applications 
including scan and sector modes.
• Size: 4.33 diameter x 7.76 inches long 
 from back of brake to front of mounting  
  ange
• Power: 28 VDC
• Rated Power Point: 320 in-lbs @ 25 rpm
• Weight: 12.5 lbs
• Rare earth brushless DC resolver  
 commutated motor
• Fail-safe electromagnetic brake with 
 manual disengage
• Robust structural design
• Low endplay
• Harmonic Drive™ gearbox
• Front ange mount
• Stroke: continuous rotation
• No-load speed: 45 rpm
• Low temperature operation to -94º F 
 with heat blanket
The Model 817 
The Model 817 Rotary Servo Actuator is 
used to position the control surfaces of a 
target drone or unmanned air vehicle and 
is designed to meet the extreme operating 
and  environmental  conditions  including 
submersion in water.
• Size: 1.60 x 4.51 x 5.00 inches  from front 
  of mounting ange to rear of housing
• Power: 28 VDC
•  Rated Power Point: 80 in lbs @ 125 deg/sec
• Weight: 2.8 lbs
• Stall torque: 300 in-lbs
• NFeB brushless DC motor with Hall 
  sensor commutation
• ±10 VDC or ±15 VDC command signal   
  input
• Electronic position and torque limiting
• Position output command
• Current output signal option
• Film position transducer
• Robust structural design
• Low endplay
Moog  Components  Group  has  been 
designing and producing specialized high 
technology  and  utility  electromechanical 
actuators for over 20 years. Total in-house 
design,  engineering  and  manufacturing 
expertise for these products. 
Rotary Servo Actuators 
Rotary  brush  motor  servo  actuators 
utilize  brush-type DC  motors  using  both 
Alnico  and  rare  earth  magnets.  These 
units have  been  designed with separate  
or imbedded analog or digital ampliers, 
spur  gearing  and  potentiometers  as 
feedback  devices.  Typical  applications 
include UAV, RPV, target drones and utility 
aircraft applications.
Model 808
The 808 Rotary 
Servo Actuator is 
used  to  position 
the  control  surfaces  and  utility  functions 
of a reconnaissance unmanned air vehicle 
and is designed to operate under extreme 
environmental conditions.
• Size: 1.1 x 2.7 x 4.0 inches
• Power: 28 VDC
• Peak torque: 100 in-lbs max
• Lightweight
•  Robust structural design
• High efciency steel gearing
• Mechanical stops
• Environmental seal
• Embedded controller
• Internal mechanical slip clutch to prevent 
 gear damage when impacting the stops
• Hybrid output stage
• Internal torque limiting
• Surface mount implementation
• RS-422/RS-485 command options
• ±10 VDC analog command
• R/C command option
• 3 gear ratios available
• No load speed: 150-510 deg/sec 
  depending on gear ratio
• Rated load and speed: consult factory 
 for motor and gear ratios
• Stroke: ±51.5° and others available
• High efciency steel gearing
• Front mount
• Stroke: ±30° 0r ±90° electrical stroke
• No-load speed: 137 deg/sec
• Bandwidth to 10 Hz
• Non-jamming mechanical stops
• Sealed to withstand submersion to 10 
  feet of water
Model 819 and 820
The 819 and 820 
Rotary Servo 
Actuators are used 
to position the throttle and control surfaces 
of  a  Remotely  Piloted  Vehicle  (RPV). 
These actuators are designed to operate 
under extreme environmental conditions.
• Size: 1.5 x 3.2 x 4.5 inches
• Power: 28 VDC
• Power point: 
 819 - 4.4 deg/sec @70 in-lbs 
 820 - 160 deg/sec @80 in-lbs
• Weight: 1.2 lbs
• Peak torque: 150 in-lbs*
• Brushless DC motor
•  Electronic position and torque limiting
• Film position transducer
• Position output signal
• RS-422/RS-485 command options
• ±10 VDC input command signal
• R/C command option
• Low backlash
• Robust structural design
• Mechanical stops
• High efciency steel gearing
• No load speed:
 819 - 6.0 deg/sec*
 820 - 190 deg/sec*
• Stroke: ±45°, plus others
*Typical values. Contact factory 
for available gear ratios.
Model 865-66
The  Model  865-66 
Rotary Servo Actuator is 
used to position the control 
surfaces of a reconnaissance 
unmanned  air  vehicle,  and  is  designed 
to operate under extreme environmental 
conditions.
• Size: 2.3 x 4.75 x 5.0 Inches
• Power: 28 VDC and ±15 VDC
Rotary Servo Actuators








