RedTail HV135H High Torque HV Servo

The HV135H is engineered for pilots who demand maximum control authority, precision, and reliability in high-performance sailplanes.

Designed for direct 2S operation, it delivers a powerful combination of high torque, fast response, and durable construction, making it ideal for larger control surfaces, flaps, and higher-load applications. Its compact footprint allows easy installation while providing a significant increase in strength over smaller servos.

A rigid metal geartrain combined with a high-resolution digital control system ensures accurate centering, smooth movement, and confident surface control across all flight conditions.

Whether you're flying in turbulent air or pushing speed between thermals, the HV135H provides a solid, locked-in feel with exceptional holding power.

Key Features

• Direct 2S LiPo (HV) operation
• High torque output for demanding applications
• Fast, precise response
• Durable all-metal geartrain
• Digital control system for accurate centering
• Dual ball bearings for smooth operation
• Compact size with increased power capability

Performance

• 8.4V: 0.09 sec / 60° | 7.1 kg·cm
• 7.4V: 0.11 sec / 60° | 6.7 kg·cm
• 6.0V: 0.13 sec / 60° | 5.6 kg·cm

In Flight

The HV135H stands out for its strong holding power and stability under load, giving you confidence on larger flaps and control surfaces where standard micro servos start to fall short.

🔹 “Soft Start” (on a servo)

• Means the servo moves more smoothly, not instantly snapping
• Reduces jerky motion
• Helps avoid stripping gears

🔹 “Lock Rotor Protection” (servo version)

• If the servo arm is stuck or blocked, it won’t keep forcing hard forever
• Helps prevent:
  • Burnt motor inside the servo
  • Gear damage

🔹 “Loss Control Protection” (this is the weird one)

On a servo, this usually means:

• If signal is lost → servo goes neutral or holds position
• Prevents random movement