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HS-77BB Servo

  • HS-77BB in box
  • HS-77BB included hardware
  • HS-77BB with quarter for scale
  • HS-77BB with a standard servo for scale
  • HS-77BB back view
  • HS-77BB side view
  • HS-77BB top view
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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.

Dimensions 1.73" x 0.90"x 0.98" (44 x 23 x 25mm)
Product Weight 1.23oz (35g)
Output Shaft Style 24 tooth (C1) 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. (
Stall Torque (6.0V) 76.3 oz/in. (
Max PWM Signal Range (Standard) 553-2305μsec
Travel per µs (out of box) .103°/μsec
Max Travel (out of box) 180°
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
Potentiometer Drive Indirect Drive
Internal Feedback Style 5KΩ Potentiometer
Output Shaft Support Top Ball Bearing
Gear Type Straight Cut Spur
Gear Material 1 Metal and 4 POM Resin Gears
Wire Length 10.2" (260mm)
Wire Gauge 25AWG

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