KST BLS905X HV Standard Brushless Tail Servo

KST BLS905X – High-Speed HV Brushless Tail Servo

Lightning-Fast Response. Precise Tail Control. Excellent Value.

Looking for a fast, powerful, and reliable tail servo for your 550–700-class RC helicopter without spending a fortune? The KST BLS905X HV Brushless Tail Servo delivers an impressive combination of speed, holding torque, precision, and durability at an excellent value.

Featuring a high-performance brushless motor, hardened steel gears, and a CNC aluminum housing, the BLS905X is engineered to deliver the fast, accurate response needed for demanding helicopter tail control.

With an incredibly fast 0.035 sec/60° speed and up to 8 kg·cm torque at 8.4V, this servo provides the responsiveness and holding power needed for aggressive 3D maneuvers, fast pirouettes, precise stops, and consistent tail authority.

Whether you're upgrading your existing tail servo or completing a new helicopter build, the BLS905X offers an outstanding balance of performance, durability, and affordability.

Key Features

• Ultra-Fast 0.035 sec/60° Speed: Exceptional response at 8.4V for demanding tail control applications.
• Up to 8 kg·cm Torque: Provides strong holding power for precise and responsive tail control.
• High-Performance Brushless Motor: Delivers fast response and efficient operation under demanding flight conditions.
• Hardened Steel Gear Train: Built for strength and durability during aggressive 3D flying.
• CNC Aluminum Housing: Rigid metal construction helps protect internal components and dissipate heat.
• High-Voltage Compatible: Supports 6.0V–8.4V operation for modern HV helicopter setups.
• Dual Ball Bearings: Provide smooth and consistent output shaft operation.
• High-Speed Tail Servo Signal: Uses 760µs / 560Hz for compatible flybarless control systems.
• Standard-Size Design: Suitable for many 550–700-class helicopters requiring a standard-size tail servo.

Technical Specifications

Recommended Applications

• 550–700-class RC helicopters
• High-performance 3D helicopter builds
• Sport and precision flying
• Helicopters requiring a standard-size, high-speed HV tail servo

Important: The BLS905X uses a 760µs tail-servo control signal. Make sure your flybarless controller supports this pulse width and select the correct servo settings before connecting or operating the servo. Do not use a standard 1520µs configuration.

Package Includes

• 1 × KST BLS905X HV Brushless Tail Servo
• Servo mounting accessories

Exceptional Speed. Precise Control. Great Value.

The KST BLS905X delivers the speed, precision, and durability that serious helicopter pilots expect from a high-performance tail servo. With its brushless motor, hardened steel gears, and incredibly fast response, it's an excellent choice for pilots looking to achieve confident, accurate tail control without the premium price tag.

KST BLS905X – Lightning-Fast Tail Performance at a Price You'll Appreciate!