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Technical Specifications
Last Updated: 2026-07-10Identity
Performance
Physical
Drivetrain
Control & Signal
Electrical & Environment
Connectivity
Origin
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| Identity | |
| Brand |  |
| Product Number | (add) |
| Category | Hobby |
| Performance | |
| Torque |
4.8V34.70 oz-in2.50 kg-cm0.2 N-m |
| Speed |
4.8V0.16 sec/60°375.0 deg/s62.5 RPM |
| Running Current | (add) |
| Stall Current | (add) |
| Shaft Power | 0.40 W |
| Physical | |
| Weight | 0.44 oz12.5 g |
| Dimensions |
L 0.89 in W 0.45 in H 0.97 in L 22.6 mm W 11.4 mm H 24.6 mm |
| Case Material | (add) |
| Drivetrain | |
| Motor Type | Brushed |
| Motor Drive | (add) |
| Gears | Metal |
| Gear Spline/Teeth | (add) |
| Rotation Mode | (add) |
| Rotation/Support | Single Bearing |
| Backlash | (add) |
| Control & Signal | |
| Modulation | Digital |
| Direction | (add) |
| Rotational Range | (add) |
| Mechanical Limit | (add) |
| Pulse Cycle | (add) |
| Pulse Width | (add) |
| Neutral Position | (add) |
| Dead Band | (add) |
| Refresh Rate | (add) |
| Angle Sensor | (add) |
| Control System | (add) |
| Programmable | (add) |
| Signal Voltage | (add) |
| Electrical & Environment | |
| Operating Voltage | (add) |
| Power Source | (add) |
| Regulator Type | (add) |
| Temperature | (add) |
| Water Rating | (add) |
| Certification | (add) |
| Idle Current | (add) |
| Connectivity | |
| Connector | JR (Universal) |
| Wire Length | (add) |
| Origin | |
| Country of Origin | (add) |
Disclaimer: Most data is sourced from the manufacturer. Some data is sourced from our loyal community and with the help of AI. We aim for accuracy but are not responsible for inaccurate information.
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Reviews (4)
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sorenlaf
September 26, 2013Application(s): Powered aircraft, gliders, NOT helis.
Comments: I run it from a 5v bec, a 4 or 5 cell nicad pack, or a 2 cell LiFe (6+ volts).
So far, the only problem has been that the output bearing seems to be of low quality, as they develop some slop fairly quickly. A friend of mine prefers the 928, which is an analog, plastic gear servo with, I believe, a bushing instead of a bearing. His comment was that the digital bearing servos got sloppy fairly quickly.
The bearing is a 5x8x2. I've been able to find a 5x8x2.5 from RcBearings, but not a 5x8x2, but I have not really tried to locate the correct size at this time. I may just try a 5x8x2.5 and see if it works.
Aside from the radial play in the shaft, they seem robust. There's some backlash, but nothing unusual for a metal gear servo.
Despite some other reports, I've had no problems running them on 6v, including using a 2 cell LiFe. I'm using them for the ailerons in my Acromaster, and their holding up well. Better than the HS55's the previous owner had used.
Dongskie
January 6, 2012Application(s): EP Airplane & 450 Heli
Comments: I have been using the CORONA 939MG on my 450 Cyclic and all over my Dynam T-28 Trojan control surfaces for over a year now.
So far non has failed on all my applications. It is powered by a Turnigy 5Amp UBEC on 5volts.
The gears are a bit noisy at times specially when binding occurs, its actually a good sign because it lets you know about the bind and or excessive loads.
Weighs a little more than most plastic 9g servos but gears are more reliable on any application.
I recommend this for light aircrafts with light to medium loads. Its a bit slow for 450 heli cyclics but does the job anyway.
kamelasty
May 25, 2010Application(s): rc plane
Comments: it is very good servo as long as you are not using it on 6V. I have heard about strenge situations wen it was used on 6V. I am using it on 5V and there is no problem with at all.
14MZ Flyer
December 24, 2009Application(s): Servos installed in 2m Glider
Comments: When setting up the servos in the wings, I had two servos fail. One Aileron and one Flap servo. The Aileron servo jammed solid, probably gears, and the Flap servo tatally burned out, melting the servo case and servo lead. I am running 6v electrics, has anybody else had the same problems? I have used Corona receivers for a couple of years without any problems.