
KST BLS915 V8.0 – High-Performance HV Brushless Cyclic Servo
Powerful. Fast. Precise. Built for Serious 3D Flying.
Looking for a high-performance cyclic servo for your 550–700-class RC helicopter without breaking the bank? The KST BLS915 V8.0 delivers an impressive combination of speed, torque, precision, and durability at an excellent value.
Featuring a powerful brushless motor, hardened steel gears, and a precision-machined aluminum housing, the BLS915 V8.0 is designed to handle the demanding loads of today's high-performance RC helicopters.
With up to 25 kg·cm of torque and a lightning-fast 0.07 sec/60° at 8.4V, it provides the strength and responsiveness needed for aggressive 3D maneuvers, sharp stops, and precise cyclic control.
Whether you're upgrading your existing helicopter or building a new machine, the BLS915 V8.0 offers a great balance of performance, durability, and affordability.
Key Features
- High-Performance Brushless Motor: Delivers fast response, strong torque, and efficient operation for demanding cyclic applications.
- Up to 25 kg·cm Torque: Provides the holding power needed for high-load cyclic control during aggressive 3D flying.
- Ultra-Fast 0.07 sec/60° Speed: Offers quick and precise control response at 8.4V.
- Hardened Steel Gear Train: Built for strength and durability under demanding flight conditions.
- CNC Aluminum Housing: Strong metal construction with cooling fins to help dissipate heat during operation.
- High-Voltage Compatible: Supports 6.0V–8.4V operation for modern HV helicopter electronics.
- Dual Ball Bearings: Help provide smooth and consistent output shaft operation.
- Programmable Features: Supports compatible KST programming tools for additional adjustments and settings.
- Standard-Size Design: Suitable for many 550–700-class helicopters using standard-size cyclic servos.
Technical Specifications
| Model | BLS915 V8.0 |
| Application | Cyclic / Swashplate |
| Motor Type | Brushless DC |
| Operating Voltage | 6.0–8.4V |
| Torque @ 6.0V | 18 kg·cm |
| Torque @ 7.4V | 22 kg·cm |
| Torque @ 8.4V | 25 kg·cm |
| Speed @ 6.0V | 0.09 sec/60° |
| Speed @ 7.4V | 0.08 sec/60° |
| Speed @ 8.4V | 0.07 sec/60° |
| Gear Material | Hardened Steel |
| Case Material | Aluminum Alloy |
| Bearings | Dual Ball Bearings |
| Default Signal | 1520µs / 333Hz |
| Dimensions | 40.5 × 20 × 38mm |
| Weight | Approx. 70g |
| Operating Temperature | -10°C to +65°C |
Recommended Applications
- 550–700-class RC helicopters
- High-performance 3D helicopter builds
- Sport and precision flying
- Helicopters requiring standard-size HV cyclic servos
Note: Always verify servo dimensions, mounting requirements, operating voltage, and compatibility with your helicopter and flybarless controller before installation.
Package Includes
- 1 × KST BLS915 V8.0 HV Brushless Cyclic Servo
Serious Performance. Excellent Value.
The KST BLS915 V8.0 proves that you don't have to spend a fortune to get a powerful, fast, and capable cyclic servo. With its brushless motor, hardened steel gears, and impressive high-voltage performance, it's an excellent choice for pilots looking to get more performance and value from their 550–700-class helicopter.
KST BLS915 V8.0 – The Performance You Want, at a Price You'll Appreciate!