Kingmax

KingMax S40SC Telemetry Brushless HV Servo – 40kg Steel Gear Waterproof

In stock
SKU: S40SC
(0)
$82.50

KingMax S40SC Brushless HV Waterproof Digital Servo with Magnetic Position Sensor

The KingMax S40SC is a high-performance brushless high-voltage servo designed for demanding RC aircraft applications requiring exceptional torque, fast response, precise positioning, and long-term durability.

Featuring an internal magnetic sensor positioner, high-precision steel gears, a full CNC aluminum case, dual ball bearings, and waterproof construction, the S40SC delivers up to 40kg-cm (555.60 oz-in) stall torque and 30kg-cm (416.70 oz-in) maximum working torque at 7.4V.

The magnetic position sensing system eliminates traditional potentiometer wear, helping provide precise positioning, excellent centering, and long service life for demanding giant-scale aircraft applications.

Features

  • Internal magnetic sensor positioner
  • Selectable rotation options: 90°, 180°, 270°, and 350°
  • High-precision steel gears
  • Full CNC aluminum hull and structure
  • High-quality brushless motor
  • Dual ball bearings (2BB)
  • Waterproof construction
  • Super long life design
  • Standard 25T spline
  • Wide voltage operation from 5.0V to 8.4V

Servo Arm Compatibility

The S40SC uses a standard 25-tooth output spline. We have verified compatibility with Futaba-style 25T servo arms and accessories, including most aftermarket aluminum, carbon fiber, and composite servo arms designed around the popular 25T standard.

Speed Performance

Voltage Operating Speed
5.0V 0.10 sec/60°
6.0V 0.08 sec/60°
7.4V 0.06 sec/60°
8.4V 0.05 sec/60°

Torque Ratings

Torque Type Voltage Torque
Stall Torque 7.4V 40kg-cm (555.60 oz-in)
Maximum Working Torque 7.4V 30kg-cm (416.70 oz-in)
Rated Working Torque 5.0V 16.5kg-cm (229.18 oz-in)
Rated Working Torque 6.0V 20.5kg-cm (284.74 oz-in)
Rated Working Torque 7.4V 22.0kg-cm (305.58 oz-in)
Rated Working Torque 8.4V 25.0kg-cm (347.25 oz-in)

Specifications

Model S40SC
Servo Type Brushless High Voltage Digital Servo
Position Sensor Magnetic Sensor Positioner
Gear Train Steel Gears
Motor Brushless Motor
Case Construction Full CNC Aluminum Hull and Structure
Bearings Dual Ball Bearings (2BB)
Spline Standard 25T
Dead Band 2μs Default
Waterproof Yes
Operating Voltage DC 5.0V–8.4V
Rated Working Voltage DC 7.4V
Working Frequency 1520μs / 330Hz
Working Angle ±63° @ 800μs–2200μs
Selectable Rotation 90° / 180° / 270° / 350°
Dimensions 40 × 20 × 39.8mm (1.56 × 0.78 × 1.55 in)
Weight 89g (3.13 oz)
Connector JR Connector
Wire Length 300mm (11.7 in)
Working Temperature -10°C to +50°C (14°F to 122°F)
Storage Temperature -20°C to +60°C (-4°F to 140°F)

Recommended Applications

  • 50cc–100cc gas-powered RC aircraft
  • Large giant-scale sport aircraft
  • IMAC and aerobatic aircraft
  • Large warbirds
  • Sport jets and turbine aircraft
  • Heavy-duty elevator installations
  • Large rudder applications
  • High-load aileron installations
  • Aircraft requiring precision positioning and strong holding power
  • Advanced aircraft setups utilizing extended rotation capabilities

Why Choose the S40SC?

  • Up to 40kg-cm (555.60 oz-in) stall torque
  • 30kg-cm (416.70 oz-in) maximum working torque
  • Fast response down to 0.05 sec/60° at 8.4V
  • Internal magnetic sensor positioner for precise positioning
  • Brushless motor for long life and efficiency
  • Steel gears for heavy-duty applications
  • Waterproof construction for demanding field conditions
  • Full CNC aluminum case for strength and heat dissipation
  • Compatible with verified Futaba-style 25T servo arms and accessories
  • Selectable rotation ranges for specialized applications

Includes

  • KingMax S40SC Brushless HV Waterproof Servo
  • Manufacturer-supplied servo accessories
  • SKU S40SC