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JR Propo NX8931 Programmable WV XBus Servo

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JR Propo NX8931 Programmable WV XBus ServoJR Propo NX8921 Programmable WV XBus Servo

Product Description

JR Propo NX Servos - Programmable Wide Voltage XBus compatible servos

JR Propo's XBus NX series servos allow not only serial servo connection, but also individual servo programming with servo adjustments to suit every application.


The NX range of servos automatically detect the type of output they are plugged into - conventional receiver PWM outputs, or XBus. This means NX series servos are XBus compatible, and also compatible with PWM receiver signals without any converter, allowing modelers to use conventional receiver systems.

When used on a JR XBus system, the NX series servos can be programmed in ways not previously possible. No additional programming device is necessary these servos can be setup using a JR XG series transmitter.

Changes made to servo programming are immediately apparent. Not only can servo direction and travel be adjusted, but it is now possible to fine tune servo gain, dead band and boost to suit your aircraft and desired response. This precise setup allows servo hunting to be eliminated and precise feel maintained.

Purpose of use: For Aerobatic Aeroplanes in competition and Giant scale aeroplanes use.


Torque: 23(4.8V)/29.6(6.6V)/36.5(7.4V)
Speed: 0.2(4.8V)/0.16(6.6V)/0.13(7.4V)Sec/60°
Weight: 72g
Dimensions: 35.0mm x 21.0mm x 40.5mm
Wire Length: 300mm
Voltage Range: 4.5V - 8.5V
Type: Wide Voltage Servo
Bearing: Double ball bearings
Gears: Metal
Case: Heatsink Case
MPU: 32Bit
Control Frequency: 1KHz (XBus 1KHz/PWM 333Hz)
Neutral: 1500μSec

* If used on a large control surface - typically aileron, rudder, elevator or flap on an airplane, Digital servos (DS/MP/MPH series) may move slightly around center while on the ground.
This is an expected phenomenon, and will not occur in the air.

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JR Servos and 4.8v

JR design their range of servos around the voltage of a 4 cell Ni-Cd or Ni-Mh battery. These batteries are rated at 4.8v but this is a nominal voltage for the battery pack. A 4 cell battery will reach slightly over 6v when fully charged.

With modern Li-Po and Li-Fe batteries being widely used, regulated power supplies are becoming common place in model aircraft to help keep the weight down, keep a stable voltage and to aid in high power situations on large aircraft with high power servos. The use of a regulated power supply upto 6v is fine to use.

However using a 5 cell Ni-Mh battery which is rated at 6v is not ok to use, this battery will reach over 7v when fully charged and may damage the servo. If you are looking to use this type of battery we would recommend the HV, WV or NX range of JR servos which can handle this extra voltage.

Ref: JRC8931NX Stock Status: pre-order Manufactured by: JR

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Price £139.95

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