HS-77BB Servo-Clockwise (stock)-Stock Rotation


With its low profile design and strong standing torque, the HS-77BB is a great choice for wing or tail mounting in aircrafts up to 1.20 size. Submarines, boats, cars and trucks can also benefit from this servo’s strength and compact size.

How Far Will This Servo Rotate?

The answer to this question is partially dependent on what you are using to control the servo.
Click for a quick video explanation.

With an Average Radio System:
Your average transmitter and receiver will output a relatively narrow PWM signal range.

Radio System + Travel Tuner:
Adding a Servo Travel Tuner to your radio system setup will allow you to achieve wide PWM signal ranges.

Wide Signal Controllers:
Controllers such as the Actobotics® Servo Controller, Arduinos, and Raspberry Pi servo hats can usually send a wide signal.

Tech Tips


Output Shaft Style C24T Spline
Voltage Range 4.8V - 6.0V
No-Load Speed (4.8V) 0.18sec/60°
No-Load Speed (6.0V) 0.14sec/60°
Stall Torque (4.8V) 61.1 oz-in. (4.4kg.cm)
Stall Torque (6.0V) 76.3 oz-in. (5.5kg.cm)
Max PWM Signal Range 553-2305μsec
Pulse Amplitude 3-5V
Operating Temperature -20°C to +60°C
Current Drain - idle (4.8V) 8mA
Current Drain - idle (6.0V) 8.8mA
Current Drain - no-load (4.8V) 250mA
Current Drain - no-load (6V) 290mA
Continuous Rotation Modifiable Yes
Direction w/ Increasing PWM Signal Clockwise
Deadband Width 8µs
Motor Type 3 Pole Ferrite
Feedback Style 5KΩ Potentiometer
Output Shaft Support Top Ball Bearing
Gear Material 1 Metal and 4 POM Resin Gears
Wire Length 10.2" (260mm)
Weight 1.23oz (35g)
Wire Gauge 25AWG
Max Rotation 180°
Travel per μsec 0.103°/μsec

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