This servo is with out doubt the best servo on the market.
It delivers awesome power with good speed and is bulletproof

Ace R/C is proud to present our new line of Digital Servos. Each of these servos exhibits high speed and torque.
So whatever your application; 1:8 scale racing, a 40% Extra or a 90 sized helicopter,
or even a large racing yacht, these servos have the power and performance to exceed your expectations.

Features:

All super precise metal gear equipped
Newly develop microprocessor processes the signal pulse more precisely and quickly
Extraordinary aluminum heat sink middle case with cooling fins to cool the coreless motor
8 screws to enhance the structure more solid to deliver the power
Supplies superior torque output with low current compensation

Specifications:

Torque (Kg-cm) / (oz.-in.) @ 6V: 12.5 / 173.6
Speed (sec / 60°) @ 6V: 0.13
Gear Type: All Metal
Bearing: Coreless
Dimensions (mm): 41.8 x 20.6 x 39.6
Weight (g/oz): 66 / 2.328