The HS-785HB servo is unique due to its ability to rotate multiple turns while retaining positioning feedback. While most servos are limited to approximately 180 degrees absolute max, the HS-785HB can rotate just over 8 turns given the proper PWM signal range. With most hobby radio systems the HS-785HB servo range is likely to be just shy of 4 rotations (assuming a 1050-1950usec PWM signal) however when using the servo with a servo controller capable of sending a wider PWM range (Arduino, Raspberry Pi, Pololu Servo Controller, etc.), the servo is able to be driven further without any modifications necessary. This large scale servo has wear resistant Karbonite gears and an output shaft supported by two ball bearings to ensure years of reliable service.
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.
|Output Shaft Style||C24T Spline|
|Voltage Range||4.8V - 6.0V|
|No-Load Speed (4.8V)||1.68sec/360°|
|No-Load Speed (6.0V)||1.4sec/360°|
|Stall Torque (4.8V)||152.75 oz-in (11 kg.cm)|
|Stall Torque (6.0V)||183 oz-in (13.2 kg.cm)|
|Max PWM Signal Range||600-2400μsec|
|Travel per µs||1.570°|
|Operating Temperature||-20°C to +60°C|
|Current Drain - idle (4.8V)||8mA|
|Current Drain - idle (6.0V)||8.7mA|
|Current Drain - no-load (4.8V)||230mA|
|Current Drain - no-load (6V)||285mA|
|Continuous Rotation Modifiable||Yes|
|Direction w/ Increasing PWM Signal||Clockwise|
|Motor Type||3 Pole Ferrite|
|Feedback Style||5KΩ Potentiometer|
|Output Shaft Support||Dual Ball Bearings|
|Wire Length||11.81" (300mm)|