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HS-788HB Servo

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Part
33788S
33788S
Status
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Details

The Hitec HS-788HB servo is based around the long-time favorite, the HS-785HB. This new model was created with a 25 tooth output spline in order to conform with the majority of the hobby servo market.   Similar to its 24 tooth cousin, this model is able to rotate multiple turns while retaining positioning feedback. Conventional servos are typically limited to a maximum of 180 degrees, which, in the steering mechanism of a remote controlled car, is plenty. Many other applications demand more than conventional servos can provide. The HS-788HB has an underdriven potentiometer so the distance it moves in relation to the output shaft is less. This allows the output shaft of the servo to turn nearly eight full rotations before the outer limits of the potentiometer are met. The final output shaft of the servo is supported by a pair of ball bearings and the gears are constructed of Karbonite plastic to provide excellent wear resistance.  

The HS-788HB servo comes with a dual spool style winch pulley for those who wish to install in a pull-pull setup. The included servo horn screw has aggressive threads and a 2.5mm socket head drive so that you can tighten the horn onto the servo without concern of rounding out the head.  The included servo mounting hardware (grommets, eyelets and screws) can be discarded when mounting in a goBILDA servo mount but can be used when mounting to wood or plastic structures, where vibration dampening is needed.

SPECS

HS-788 Servo

Dimensions 2.91" x 1.12" x 2.04" (73.8mm x 28.5mm x 51.9mm)
Product Weight 3.42oz (97g)
Output Shaft Style 25 tooth (H25T) spline
Voltage Range 4.8V ~ 6V
No-Load Speed (4.8V) 1.68 sec/60°
No-Load Speed (6.0V) 1.38 sec/60°
Stall Torque (4.8V) 153 oz-in (11.0 kg.cm)
Stall Torque (6.0V) 183 oz-in (13.2 kg.cm)
Max PWM Signal Range 600-2400μsec
Travel per µs (out of box) 1.57°/μsec
Max Travel Per μsec 2826°
Pulse Amplitude 3-5V
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
Deadband Width 8 μsec
Motor Type 3 Pole Ferrite
Potentiometer Drive Indirect Drive
Internal Feedback Style 5KΩ Potentiometer
Output Shaft Support Dual Ball Bearings
Gear Type Straight Cut Spur
Gear Material Karbonite
Wire Length 11.81" (300mm)
Wire Gauge 22 AWG
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