HobbyKing 939MG Metal Gear Servo 2.5kg/ 0.14sec / 12.5g
A strong performer with a very smooth movement and good centering.
Excellent for parkflyers or planes up to .40 size (3,500mAh electric).
Operating Voltage: 4.8V / 6.0V
Operating Current: 200mA / 240mA
Operateing speed : 0.14sec.60° / 0.13sec.60°
Stall torque : 2.5kg.cm / 2.7kg.cm
Dead band : ≤5uSec
Operateing speed: 40º/one side pulse traveling 400us
Potentiometer: 2 slider/Direct Drive
Ball bearing: MR85
Connector wire length: 215mm
Operating Temperature Range: -20 °C to +60°C
Spline count: 21
Unit Weight (g):
Good servos, I recomend them.Me sorprendió su pequeño tamaño, está muy bien.Habe diese Servo in den Mpx Heron eingbaut sie sind in der Rückstellung genau und die Getriebe halten auch in den Flaps hohes Gras beim Landen ohne Probleme aus. Sehr gutes Servo welches ich Empfehlen ich kann.T-REX 470LP $193 and three 939MG Servo MG $$4.89 are a super match. 470L (380) needs a better servo for the tail but for 380 cyclic these servo are the buy.Good servo but the legs that screw down with are not solid so a little to much torque and the legs snap or deform. Replacement servo case would be nice but you can not beat the servo cost.Good servo but the legs that screw down with are not solid so a little to much torque and the legs snap or deform. Replacement servo case would be nice but you can not beat the servo cost.Kraftvolles Servo, nur das Gehuse Plastik ist meines Erachtens billig. Schade, dass wre die Top-Wertung geworden. Fr Flchenmodelle guter Durchschnitt.I ordered 4 of them. Tested and all working. I will update my review when I start to use them in my trainer.Compared to what I needed, I got metal gears instead of carbonite gears (my personal opinion: good, some more play, but robust), some more weight (12 instead of 9g), but 11,5 height instead of 9mm, what caused design modifications. on the other side: I paid 75pcnt less, this helps a lot for the efforts needed.Caution Be a little careful which receiver you match these servos with. Even individually they can momentarily draw a current demand large enough to cause a voltage drop sufficient to reboot your receiver, resulting in a couple of seconds brown out whilst it re-initialises. Displays this trait on an orange R620, even with just a single servo moved rapidly and with two different dedicated high rated receiver batteries so not a low rated BEC issue. RX works fine with no drop outs with HXT900s or Turnigy TGY5009M. Others are finding this too with the Corona / Hobbyking 929 / 939 series and are putting capacitors across the RX pins to avoid it, but you might just prefer to get a less spikey servo!