For the ultimate in tail control for you RC helicopters look no further than the BLS-18AN narrow band servo.
 
DETAILS
Application / Suitable
Only for Helicopter tail [ Rudder ]
 
Specifications
Torque At 6.0V
13.8 kg-cm / 191.7 oz-in
Torque At 7.4V
17.1 kg-cm / 237.5 oz-in
Torque At 8.4V
19.4 kg-cm / 269.5 oz-in
Speed At 6.0V
0.045 sec / 60°
Speed At 7.4V
0.038 sec / 60°
Speed At 8.4V
0.033 sec / 60°
 
Protection Mechanism
Soft Start Protection
Soft start to a neutral position.
Over Voltage Protection
Over 9.0V drive the protection mode and 8.4V return to normal mode.
Low Voltage Protection
Lower than 4.0V, drive the protection mode and 4.5V return to normal mode.
Locked Rotor Protection
Stall in 5 sec, output torque goes down.
Temperature Protection
Overheat 85 degrees C (185 degrees F), drive the protection mode and down 75 degrees C (167 degrees F) return to normal mode.
Lose Control Protection
When losing the transmitter signal, that servo will be back to the neutral position immediately and lock.
 
Power Supply
Operating Voltage Range
 4.5V ~ 8.5V ( 4 ~ 6 Cell Ni-MH or 2S Li-Poly / 2S Li-Fe)
 
Control Specification
Control System
Digital Controller / AD 12-Bits Resolution ( 4096 Steps )
Frequency：333 or 560Hz / Neutral : 760us Narrow Band
Dead Band Width
0.001ms ( Default：1us)
 
Mechanical Specifications
Ball Bearing
Dual
Gear
Titanium W/ Nanometer Alloy Gears
Motor
High Premium Brushless Motor
Horn / Gear Spline
25 Teeth ( Same as F-Type )
 
Physical Specs
Dimension (mm)
40.5 x 20 x 39 mm / 1.59 x 0.79 x 1.54 in
Weight (gram)
76 ± 1 grams / 2.68 oz