Designed specifically to conquer the extreme cyclic loads of 550 to 700 class 3D and F3C competition helicopters, the KST SV915-12 super high-voltage brushless cyclic servo delivers an immense 30 kgf.cm of stall torque and a blistering 0.07s/60° transit speed at 13V. Featuring direct 3S LiPo / 12V battery drive capability, an ultra-durable brushless motor, and hardened steel gears enclosed in a full CNC aluminum casing, the SV915-12 provides the unyielding swashplate authority and instantaneous pitch response that aggressive competition pilots demand.

Key Features

• Colossal 30 kgf.cm Holding Torque: Provides massive swashplate control authority under extreme collective pitch-pumps and high-speed directional changes, eliminating cyclic deflection.
• Super High-Voltage (SHV) Direct Drive: Wide 8.0V–13.0V operating range allows direct connection to 3S LiPo receiver packs — eliminating heavy BEC voltage regulators, simplifying airframe wiring, and lowering system weight.
• Blistering 0.07s Speed: Fast 0.07 sec/60° transit response at 13V (0.08s at 12V) ensures instantaneous flybarless (FBL) cyclic tracking and razor-sharp maneuvering precision.
• High-Efficiency Brushless DC Motor: Delivers higher sustained torque output, cooler operating temperatures, and exceptional service life with zero brush wear under relentless 3D flight routines.
• Hardened Steel Geartrain: Precision-cut steel gears supported by dual ball bearings minimize backlash, resist impact loads from hard autorotations, and maintain precise centering over hundreds of flights.
• Full CNC Aluminum Casing: Precision-machined alloy housing provides maximum structural rigidity, exact mounting alignment, and rapid thermal dissipation during high-power sessions.
• Programmable: Supports customizable servo parameters via KST programming tool (please refer to programming tool manual for voltage compatibility).

Technical Specifications

• Model: SV915-12 Brushless Cyclic Servo
• Application: 550–700 Class RC Helicopter Cyclic / Swashplate
• Rated Voltage: DC 12.0V
• Voltage Range: DC 8.0V – 13.0V (2S–3S LiPo Direct Drive)
• Working Frequency: 760μs / 560Hz
• Motor Type: Brushless DC Motor
• Gear Set Material: Hardened Steel
• Case Material: CNC Aluminum Alloy
• Bearings: Dual Ball Bearings (2BB)
• Position Sensor: Potentiometer
• Operating Temperature: -10°C to +65°C
• Programmable: Yes
• Dimensions: 40.5 × 20.0 × 38.0 mm (±0.2mm)
• Weight: 70g (±10%)

Performance Ratings

• Stall Torque:
  • 24 kgf.cm @ 8.4V
  • 28 kgf.cm @ 12.0V
  • 30 kgf.cm @ 13.0V
• Operating Speed (No-Load):
  • 0.10 sec/60° @ 8.4V
  • 0.08 sec/60° @ 12.0V
  • 0.07 sec/60° @ 13.0V

Dimensions & Sizing

Documentation

• Download SV915-12 HV Brushless Servo Technical Specification Sheet (PDF)