Corona 939MG Digital Metal Gear Servo 2.7kg / 0.13sec / 12.5gModel: DS939MG
Operating Voltage: 4.8V / 6.0V
Operating Current: 200mA / 240mA
Operating Speed: 0.14sec.60º/ 0.13sec.60º
Stall Torque: 2.5kg.cm / 2.7kg.cm
Dead Band: ≤3uSec
Operating Travel: 40º/one side pulse traveling 400us
Potentiometer: 2 slider/Direct Drive
Ball bearing: MR85
Connector wire: 215mm
Operating Temperature Range: -20J+60J
Unit Weight (g):
Strong and fast enough for a lot of applications, e. g. wing servo in thin wings, rudder or elevator servo in small fuselages. The gear is running noisy.The good:
These come retail packaged and appear well made. The casing is quite strong, certainly stronger than the plastic used on the 9g SG90 & HXT900 servos.
The output spline is well cut and engages well with the provided arms. Strength-wise the servo produces a lot of torque, much more than the aforementioned 9g servos and the gear train doesn't slip. It resists counter force extremely well.
As you would expect from a digital servo it handles a wide range of pulse widths without issue and centers where it should. It's range of movement is slightly wider than the aforementioned servos.
The accessory kit is very good, much better then you usually get with a servo.
I ordered two and one of them makes a buzzing noise, although this doesn't seem to affect it's operation. They get a little warm when run continuously on the servo tester but not enough to get worried about. As the specifications suggest the speed is a little slow (0.14/sec) but this should be fine for most non-3D flyers.
When compared to an ordinary 9g servo it feels noticeably heavier and I can believe that there's a ~3g difference.Good servo di u prezzuServo alus keur harganaGute Servo für den Preisأجهزة جيدة للسعرBon servo pour le prixI've ordered eight pcs of this servo from HK UK. Maybe I was unlucky but EACH of it has 1mm clearance at the end of the smallest lever, just after unpacking.
How can someone say that this servo centers very well, if it has 1mm clearance :-) ???
TP servos are twice cheaper and 10 times better, why would anyone buy this ?
Anyway, any advise for precise, reliable 10-15g servo upto 20$ ??Awesome servos. works great on my AJ Slick 51" No flawsGreat torque, great centering, very smooth. The servos tend to buzz without load, but since they don't draw any current, it's not a problem. Using 2 on my Teksumo without any problem.
Corona 939MG Digital Metal Gear Servo 2.7kg / 0.13sec / 12.5g download now [2.12Mb]