Hitec HS-8385TH HV Hi Res Ultra Torque Ti Gear Servo

Ideal for giant scale aircraft
Non-programmable digital circuitry
Aluminum center heatsink
Titanium gears
Efficient coreless motor
Standard 25 tooth spline
Two year limited warranty through Hitec beginning at date of purchase

HS-8385TH Servo with extra 3x8mm Horn Screw, Instruction Sheet
0.94" (24mm) Single Arm Horn
1.2" (32mm) Single Arm Horn
2.1" (54mm) Single Arm Horn
1.4" (36mm) diameter Round Horn
1.5" (38mm) Four Point Horn
4.25" (108mm) Double Arm Horn
2.8" (72mm) Double Arm Horn
1.7" (44mm) Double Arm Horn

6.0V 7.4V
Speed: 0.17 sec/60° 0.14 sec/60°
Torque: 403 oz-in (17 kg-cm) 486 oz-in (17 kg-cm)
Dimensions: 1.57 x 0.79 x 1.50" (40 x 20 x 38mm)
Weight: 2.40oz (68g)
Number of Teeth in Spline: 25

A note on Coreless motors. A conventional servo motor has a steel
core armature wrapped with with wire that spins inside the magnets.
In a Coreless design, the armature uses a thin wire mesh that forms
a cup that spins around the outside of the magnet eliminating the
heavy steel core. This design is much lighter resulting in smoother
operation and faster response time.