HS-81 is a popular Hitec servo for power planes, heli’s, sail or boats, cars and trucks. The HS81 gives a good balance of speed and torque.

HS-81 Servo Specifications

Performance Specifications

Operating Voltage Range (Volts DC) 4.8V ~ 6.0V

Speed (Second @ 60°) 0.11 ~ 0.09

Maximum Torque Range oz. / in. 36 ~ 42

Maximum Torque Range kg. / cm. 2.6 ~ 3.0

Current Draw at Idle 8.8 mA

No Load Operating Current Draw 280 mA

Stall Current Draw 1,500 mA

Dead Band Width 8 µs

Physical Specifications

Dimensions (Inches) 1.17 x 0.47 x 1.16

Dimensions (Metric) 29.8 x 12.0 x 29.6

Weight (Ounces) 0.58

Weight (Gram) 16.6

Circuit Type HT7003 Analog SMT

Motor Type 3 Pole Metal Brush Ferrite

Gear Material Nylon

Bearing Type None

Output Shaft (type / Ømm) Standard 24

Case Material Plastic

Connector Gauge (AWG) / Strand Count 28 / 20

Radio Control Applications

Parkflyer < 50 oz.

Sport Plane 42 - 50 oz.

Sailplane < 2 meter / DLG

Electric Helicopter 400 - 500mm

Gas Helicopter 30 - 39 Class