HBL669 Brushless Titanium Gear High Speed High Voltage Digital Tail Servo from MKS
The MKS HBL669 High Voltage Brushless Titanium Gear High Speed Digital Tail Servo is recommended for helicopter tail applications. The HBL line of servos has been designed exclusively for high voltage applications making them a great match with an unregulated 2S LiPo battery pack. In addition, the HBL series of servo's are lightning fast, extremely strong and operate with little noise. The HBL669 is well suited to surface and aircraft applications, and is an excellent tail servo for all 600, 700, and 800 size RC helicopters.
Features:

Excellent choice for high voltage applications
Incredibly fast, strong and minimal noise
Aluminum body and titanium gears
Dual ball bearing output shaft
Water and dust resistant sealed case allows servo to operate in extreme environments
Perfect size, weight, and torque for 600, 700, and 800 size RC helicopters

Includes:

MKS HBL669 Tail Servo
2 Servo arms
2 Mounting brackets
Set of screws