Servo drive KST X20-4208

Order the powerful KST X20-4208 V8.0 servo drive for your large FPV drone and complex mechanisms!

Give your actuators exceptional power and precision control. The KST X20-4208 V8.0 servo is designed for the most demanding applications including large FPV drones, cargo drop systems, professional gimbal rotating mechanisms, as well as 1:7 and 1:8 scale RC cars and high-performance aerobatic aircraft.

Featuring a powerful 4-pole brushless motor and a heavy-duty six-bearing gearbox, this servo delivers tremendous force and lightning-fast response. The rugged CNC aluminum housing and IP65 splash protection ensure flawless performance even in the most extreme flight conditions.

• Innovative 4-pole brushless motor. Provides high efficiency, instant response and exceptional durability .

• Colossal torque. Develops force up to 46 kg/cm at 8.4V for confident control of the heaviest mechanisms.

• Lightning speed. Just 0.07 seconds per 60 degrees at 8.4V guarantees perfect response to pilot commands.

• Maximum reliability. Six precision ball bearings and hardened steel HLS gears guarantee long service life and minimal backlash .

• Protection from external influences. IP65 rated CNC aluminum housing provides rigidity, heat dissipation and splash resistance .

Operating principle and design features

KST X20-4208 V8.0 is a digital HV servo drive based on advanced 4-pole brushless motor technology. Unlike traditional motors, this design provides significantly faster response speed and efficiency, which is critical for accurately positioning load release mechanisms or controlling camera gimbals in dynamic flight . The high-precision digital controller processes the signal at a frequency of 333 Hz (1520 µs), ensuring exceptional accuracy and smooth movement without jerking.

The durable, CNC-machined, aircraft-grade aluminum casing not only adds rigidity to the structure, but also effectively dissipates heat, maintaining stable performance under long-term use. The unique gearbox design with six precision ball bearings and hardened steel HLS (High Life Span) gears ensures incredible durability and resistance to the shock loads inevitable in hard drone landings . IP65 protection reliably protects the internal electronics from splashes and dust .

Specifications and programming

The servo has a standard 25T output shaft spline, compatible with most rockers. The ability to program parameters through a special programmer allows you to precisely adapt its operation to specific tasks, including setting the zero point and speed. Its versatility makes it an ideal choice for controlling cargo release systems on heavy drones, gimbal rotators, and other critical applications.

Specifications

• Rated voltage: 7.4V DC
• Operating voltage range: 6.0-8.4 VDC
• Torque:
• 38 kg cm at 6.0 V
• 42 kg cm at 7.4 V
• 46 kg cm at 8.4 V
• Speed:
• 0.10 s at 60° at 6.0 V
• 0.08 s at 60° at 7.4 V
• 0.07 s at 60° at 8.4 V
• Stall Current: 8.80 A at 6.0 V, 10.8 A at 7.4 V, 12.3 A at 8.4 V
• Operating frequency: 1520 µs / 333 Hz
• Rotation angle: ±100° (total 200°)
• Operating temperature range: -20° to +65° C
• Soft start function: programmable
• Programmable
• Shell material: aluminum alloy
• Motor type: 4-pole brushless DC motor
• Gear material: Hardened Steel, HLS
• Bearings: 6 ball (6BB)
• Protection degree: IP65 (splashproof)
• Case dimensions: 40 × 20 × 40 mm ± 0.2 mm
• Weight: 80g ± 10%.