RedTail HV09H High Voltage Precision Servo

The HV09H is engineered for pilots who demand precision, efficiency, and reliability in high-performance sailplanes.

Designed for direct 2S operation, it delivers a refined balance of speed, torque, and low weight, making it ideal for modern F5J and F3K airframes. Its compact footprint fits easily into thin wings and narrow fuselages, without compromising strength.

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 working light lift or transitioning at speed, the HV09H provides a connected, precise feel in the air.

Key Features

• Direct 2S LiPo (HV) operation
• Optimized balance of weight and torque
• Fast, precise response
• Durable metal geartrain
• Digital control system for accurate centering
• Dual ball bearings for smooth operation
• Compact size for modern thin-wing designs

Performance

• 8.4V: 0.09 sec / 60° | 4.7 kg·cm
• 7.4V: 0.10 sec / 60° | 4.3 kg·cm
• 6.0V: 0.13 sec / 60° | 3.7 kg·cm

In Flight

The HV09H stands out for its clean centering and solid holding power, giving you confidence on flaps and ailerons without adding unnecessary weight.

🔹 “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