Regarded across the international soaring community as the benchmark 10mm wing servo, the KST X10 V8.0 high-voltage digital servo combines unmatched holding torque, ultra-smooth coreless motor travel, and rock-solid hardened steel gears in a slender 28g profile. Delivering up to 10.8 kgf.cm of torque and a blistering 0.10s/60° speed at 8.4V, the X10 V8.0 rivals and outperforms servos costing twice as much — providing uncompromising aileron authority, razor-sharp flap response, and zero-backlash centering for F3F slope racers, F3B, F3J, and F5J competition sailplanes.

Key Features

• Ultra-Slim 10mm Wing Profile: Compact 10mm thickness drops directly into modern thin-airfoil glider wing bays without surface bulging or extensive structural modification.
• High-Voltage Operation: Wide 4.8V–8.4V operating range supports direct 2S LiPo connection — eliminating voltage regulators, reducing weight, and simplifying harness wiring.
• Formidable 10.8 kgf.cm Holding Torque: Provides immense holding power on heavily cambered flaps and high-speed ailerons, resisting massive aerodynamic hinge loads during aggressive turns and high-energy dives.
• Coreless DC Motor: Ultra-responsive coreless motor delivers instantaneous start-up, silky smooth linear travel, and exceptional centering precision with near-zero deadband.
• Hardened Steel Geartrain: Precision-cut steel gears supported by dual ball bearings minimize backlash, resist landing flap strikes, and maintain tight gear mesh over hundreds of flight hours.
• Full CNC Aluminum Casing: Precision-machined alloy case ensures perfect servo frame fitment, rigid geartrain alignment, and rapid thermal dissipation during high-frequency telemetry cycles.
• Programmable & Soft Start: Configurable travel limits and soft-start ramp protection to safeguard linkages and control horn mounts on power-up.

Technical Specifications

• Model: X10 V8.0 Digital Wing Servo
• Application: F3F, F3B, F3J, F5J Competition Gliders, High-Performance Sailplanes
• Rated Voltage: DC 7.4V
• Voltage Range: DC 4.8V – 8.4V (2S LiPo Direct Drive)
• Motor Type: Coreless DC Motor
• Gear Set Material: Hardened Steel
• Case Material: CNC Aluminum Alloy
• Bearings: Dual Ball Bearings (2BB)
• Position Sensor: Potentiometer
• Working Frequency: 1520μs / 333Hz
• Default Travel Angle: ±50° (100° Total)
• Operating Temperature: -10°C to +65°C
• Lead Length: 15 cm
• Soft Start / Programmability: Yes (Programmable)
• Dimensions: 30.0 × 10.0 × 35.5 mm (±0.2mm)
• Weight: 28g (±10%)

Performance Ratings

• Stall Torque:
  • 6.2 kgf.cm @ 4.8V
  • 7.5 kgf.cm @ 6.0V
  • 9.5 kgf.cm @ 7.4V
  • 10.8 kgf.cm @ 8.4V
• Operating Speed (No-Load):
  • 0.16 sec/60° @ 4.8V
  • 0.14 sec/60° @ 6.0V
  • 0.12 sec/60° @ 7.4V
  • 0.10 sec/60° @ 8.4V

Dimensions & Sizing

Documentation

• X10 V8.0 Technical Specification Sheet (PDF)