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Xpert RC SI-4431 Brushless Servo 19.25kg 0.07 Sec 6.6v Alloy Center Case 4.8-6.6v
L&L models

Xpert RC SI-4431 Brushless Servo 19.25kg 0.07 Sec 6.6v Alloy Center Case 4.8-6.6v

Regular price £65.00 £0.00
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Xpert RC SI-4431 Brushless Servo 19.25kg 0.07 Sec 6.6v Alloy Center Case 4.8-6.6v

Xpert Servos are a range of high spec servos, ALL of which are brushless for reduced current draw, increased efficiency and reduced running temperatures.

Xpert RC have been developing this range for some time now and have been carrying out extended durability testing and performance testing is some of the toughest fields in the market including 1/8th Buggy and Truggy as well as some very large high demand flight units.

Xpert have taken a quality first approach with the entire range and focus on high performance.

The quality of these servos has stunned us, featuring very precise PCB production and use of only the highest quality components. The quality is apparent as soon as the servo is first seen but becomes even more apparent when used exhibiting extreme accuracy and position holding.

SI Range.

All SI Series servos all feature brushless motors and 4096 steps of resolution giving ultra precise control and low current draw.

The SI Series servos feature a machined outer case which locates directly on the brushless motor to provide cooling, increasing efficiency and strength. Also features O Ring seals between case sections and even on the retaining screws.

  • Brushless Motor provides superb speed and power as well as stunning efficiency and low current draw even in relatively high torque applications..
  • 4096 Resolution steps provides super accurate class leading control
  • CNC Machined outer case gives strength and cooling to the servo
  • Fully ballraced, metal geared high precision drive train.
  • One of the lightest servos on the market in this class at just 65g
  • Comes supllied with mounting grommets to reduce vibration through to the servo, a selection of horns and fittings.


All Xpert RC Servos will come with a 12month warranty, which is an exchange warranty rather than repair. NB This does not cover water damage or incorrect set up of the servo such as EPA settings / servo stalling.

SI-4431 Specifications.

 Dimensions: L40mm x W20mm x H37.8mm
Weight: 65.0g
Speed @ 6.6v / 60deg 0.070secs
Torque @ 6.6v 19.25 kg/cm (267.19 oz/in)
Speed @ 6.0v / 60deg 0.080secs
Torque @ 6.0v 17.50 kg/cm (242.90 oz/in)
 Speed @ 4.8v / 60deg 0.100secs
Torque @ 4.8v 14.00 kg/cm (194.32 oz/in)
Gear:  7075 Aircraft Alloy
Bearing:  2BB
Case:  Outer Aluminium
25 Tooth Spline
Operating Voltage 4.8v – 6.6v
Suggested Useage: 1/10 1/8th Buggy + TC, 500-600 Heli.

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