Futaba S3305 High-Torque Standard Servo w/Metal Gears  [S3305]

This is actually the Futaba S3305 Tall Torque, Metal Gear Servo.
per Futaba this servo is approved for use with NiCd batteries JUST!

It can produce high-current draw from your own batteries if making use of NiMH or LiPo batteries, get them to capable of delivering sufficient amps.


FEATURES:
Wide usage in automobiles and ships that want standard size, high torque servos
Two ball bearings
3-pole engine
Standard Futaba J style connector
Steel gears
Twelve months warranty

INCLUDES:
One Futaba S3305 High Torque Metal Gear Servo with 1.5" (39mm) diameter horn, 1.2" (32mm) 6 point horn, 4 eyelets, 4 rubber grommets, and 4 mounting screws

SPECS:
Proportions: 1.6 x 0.8 x 1.5" (40 x 20 x 38mm)
Weight: 1.7oz (47g)
Speed: 0.25 sec/60�X @ 4.8V
0.20 sec/60�X @ 6V
Torque: 124 oz-in (8.9 kg-cm) at 6V
99 oz-in (7.1 kg-cm) at 4.8V

COMMENTARY:
Gear set FUTM3384 or DTXM3505
Instance set FUTM2948
Futaba suggests these for vehicles and boats.