Henge MD933 Servo

Specifications

Modulation:	Digital
Torque:	4.8V: 25.00 oz-in (1.80 kg-cm) 6.0V: 27.77 oz-in (2.00 kg-cm)
Speed:	4.8V: 0.12 sec/60° 6.0V: 0.10 sec/60°
Weight:	0.42 oz (12.0 g)
Dimensions:	Length:0.89 in (22.5 mm) Width:0.45 in (11.5 mm) Height:0.97 in (24.6 mm)
Motor Type:	Brushed
Gear Type:	Hybrid
Rotation/Support:	Single Bearing
Rotational Range:	60°
Pulse Cycle:	4 ms
Pulse Width:	850-2150 µs
Connector Type:	(add)

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Josh

October 23, 2016

Rating:

Application(s): T-Rex 450 and Tarot Pro 450

Comments: I have never had an issue with these servos. Yes they are inexpensive but they still perform as well my align servos. I have over a thousand hours on my Tarot 450 that run these servos for the cyclic and rudder. They have never once failed me. I plan to buy more to begin my next project.
2Doggs

September 26, 2012

Rating:

Application(s): Cyclic servos on 450 Pro heli

Comments: Of four 933's I bought for my 450, one jittered around neutral. I always buy at least one spare servo when using cheap servos.
They are a perfect fit in the 450 Pro, and the gear train is reasonably tight. On a servo tester, the speed shows as 0.13s @ 6v, rather than the claimed 0.1s. They work pretty well on the 450, however.
The cases are fragile, though, and break quite easily in a crash. I fitted some weak HK blue servo arms which helped protect them until my last big crash, when the mounting lugs broke off both aileron servos.
As a stop gap, I even rebuilt the heli with the aileron servos fixed to the main frames with double sided tape, which actually worked well.
I ended up buying Align DS410's to replace them, however, and the heli flies noticebly better with the 410's.
I rate the 933's four star for their decent performance at a low price - the cases are too weak to merit a five star rating.