Hitec HS-81 - Standard Micro Servo

Specifications

Modulation:	Analog
Torque:	4.8V: 36.00 oz-in (2.59 kg-cm) 6.0V: 42.00 oz-in (3.02 kg-cm)
Speed:	4.8V: 0.11 sec/60° 6.0V: 0.09 sec/60°
Weight:	0.58 oz (16.4 g)
Dimensions:	Length:1.17 in (29.7 mm) Width:0.47 in (11.9 mm) Height:1.16 in (29.5 mm)
Motor Type:	3-pole
Gear Type:	Plastic
Rotation/Support:	Bushing
Rotational Range:	180°
Pulse Cycle:	20 ms
Pulse Width:	900-2100 µs
Connector Type:	(add)

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wally

June 17, 2016

Rating:

Application(s): 1500mm warbird

Comments: These are cheap so i guess you get what you pay for. The gears strip easily. Had a crash and both ailerin servos striped.
Trick Wings, Zagi

February 4, 2014

Rating:

Application(s): The HS-80 and later the HS-81 has been used for elevon servos in the Zagi THL and all of the electric flying wings for 15 years.

Comments: The way we rate servos is by service, availability and price. The HS-81 rates high for our mixed elevon application. Very few returns or user issues. It's a reliable servo.
Gary Parker

January 13, 2012

Rating:

Application(s): Mid-size power planes and gliders

Comments: I have been disappointed by these servos. Sure, they are cheap, but they develop slop, and they strip easily. Hitec HS-85MGs are the same size but are far stronger and better. But then again, 85s cost around twice as much.
RocketGuy

November 7, 2009

Rating:

Application(s): Elevon control, CombatWings MiniXE (100mph 34"flying wing)

Comments: A solid well modulated servo. Quick, precise, and crash resistant. Very impressive for a micro servo. I frequently had roll rates exceeding 600deg/sec and yet was able to instinctively enter level flight at will.