KingMax BLS4309 Brushless HV Waterproof Servo – 48kg High Torque Digital Servo
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KingMax BLS4309 Brushless HV Waterproof Digital Servo
The KingMax BLS4309 is a high-performance brushless high-voltage digital servo engineered for giant-scale RC aircraft requiring an excellent balance of torque, speed, durability, and precision control.
Featuring a high-quality brushless motor, high-precision steel gears, full CNC aluminum case construction, waterproof protection, and dual ball bearings, the BLS4309 delivers up to 48kg-cm (666.72 oz-in) of torque at 8.4V while maintaining fast response speeds as low as 0.08 sec/60°.
The BLS4309 is an excellent choice for giant-scale aerobatic aircraft, large warbirds, turbine jets, and high-load control surface applications where both strong holding power and fast response are important.
Features
- High-performance digital standard servo
- High-precision steel gears
- Full CNC aluminum hull and structure
- High-quality brushless motor
- Dual ball bearings (2BB)
- Waterproof construction
- Standard 25T spline
- Wide voltage operation from 5.0V to 8.4V
- Designed for demanding giant-scale aircraft applications
- Load-tested for high-torque operation
Servo Arm Compatibility
The BLS4309 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 | 0.14 sec/60° |
| 6.0V | 0.11 sec/60° |
| 7.4V | 0.09 sec/60° |
| 8.4V | 0.08 sec/60° |
Torque Performance
| Voltage | Stall Torque |
|---|---|
| 5.0V | 30.0kg-cm (416.70 oz-in) |
| 6.0V | 35.0kg-cm (486.15 oz-in) |
| 7.4V | 43.0kg-cm (597.27 oz-in) |
| 8.4V | 48.0kg-cm (666.72 oz-in) |
Specifications
| Model | BLS4309 |
| Servo Type | Digital Standard Servo |
| 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 |
| Dimensions | 40 × 20 × 39.1mm (1.57 × 0.79 × 1.52 in) |
| Weight | 85g (2.99 oz) |
| Connector | JR Connector |
| Wire Length | 310mm (12.09 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
- 60cc–120cc 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 strong holding power and fast response
- Large-scale aircraft utilizing high-voltage servo systems
Why Choose the BLS4309?
- Up to 48kg-cm (666.72 oz-in) torque at 8.4V
- Fast response down to 0.08 sec/60°
- Designed for demanding giant-scale aircraft control surfaces
- Load-tested for high-torque applications
- Brushless motor for long service life and efficiency
- High-precision steel gears for heavy-duty performance
- 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
- Excellent balance of speed, torque, and holding power
Includes
- KingMax BLS4309 Brushless HV Waterproof Digital Servo
- Manufacturer-supplied servo accessories
- SKU BLS4309