This is the Futaba GY611 Gyro with the BLS251 Brushless Digital Servo.
Super narrow pulse drive system substantially improves servo response.
Microcomputer high-speed arithmetic processing substantially improves gyro response.
High-resolution 12-bit A/D (Analog to Digital) accurately converts sensor output to a digital signal.
SMM (Silicone Micro Machining) micro-machining mechanical parts and systems right on a silicone chip and also low-back aeroform case improves vibration resistance and neutral characteristic .
AVCS (Angular Vector Control System) (same as heading hold) system requires a high-precision angular velocity detection function and extremely small output drift by using a new type of gyro sensor.
This minimizes rudder neutral position drift during flight and eliminates the need to trim the rudder during flight.
Futaba BLS251 S9254 Digital Heli Rudder Servo is designed specifically for helicopter rudder operation. This hyper fast digital servo is ideal for tail rotor control on helicopters as well as many other applications requiring the ultimate in speed of response, yet still requiring good torque.
This servo features a Brushless motor that lasts longer and operates at a lower temperature than a brushed motor with 30% faster response times, smoother operation and a dual bearing gear train.
Compatible with Super Narrow Pulse (760µs) drive.
Yaw-axis stabilizer for helicopter gyro
Display Device: 8-character dot matrix liquid crystal display
Operating Voltage Range: DC 3.8V to 5V
Current Drain: 70mA (@5.0V, including sensor)
Dimensions: Amp 2.2"x 1.2"x 0.59" (57 x 32 x 15mm)
Sensor 1.2"x 1.2" x 0.71" (30mm x 30mm x 18mm)
Weight: Amp 1.19oz (34g)
Sensor 1.05oz (30g)
Futaba GY611 sensor
Double sided tape and metal plate
im rebuilding a 700 and this should be the ultimate addition to my new helli. this was absolutly more than i was going to spend but after reading all the info on it i had to . i mean 30pcnt faster i cant hardly imagine i should be able to get out of trick much eaisier faster and with this is will automaticly be more stable and much much smother to fly. anyway i will update when it is a complete helli again thanks hobbyking.