au Futaba BLS251 Brushless Digital Heli Tail Servo for RC Helicopters . Designed specifically for helicopter rudder operation the BLS251 Brushless Digital Heli Rudder Servo is equipped with a Brushless motor. This results in 30% faster response times and smoother operation than servo's with a typical Brushed motor. It also lasts longer and operates at a lower temperature than a Brushed motor servo and uses the same power consumption and centering as a Digital servo equipped with a Brushed motor!
Please note: The Futaba BLS251 Brushless Digital Heli Rudder Servo works only with super narrow pulse width gyro's. This includes the Futaba GY520, GY601, GY611, The Spartan Quark and DS760 gyros or others that use a 760µs drive pulse signal. This servo can produce high-current draw from your batteries. If using NiMH or LiPo batteries, make sure they are capable of delivering sufficient amps!
Features: Equipped with a Brushless motor that lasts longer and operates at a lower temperature than Brushed motors Samarium Cobalt magnets and dual ball bearings 30% faster response times, smoother operation. Same power consumption and centering as Digital servos equipped with Brushed motors Standard size Metal gears One-year warranty
Includes: Futaba BLS251 Brushless Digital Heli Rudder Servo with universal connector, 0.83" (21mm) diameter round horn pre-mounted 1.8" (45mm) diameter round horn 1.2" (32mm) diameter 6-point horn 1.5" (38.5mm) 4-point horn Servo mounting hardware
Torque @ 4.8V: 53 oz-in (3.8 kg-cm)
Speed @ 4.8V: 0.06 sec
Dimensions: 1.6 x 0.8 x 1.5" (40 x 20 x 36.8mm)
Weight: 2.1oz (59.5g)
Note: This servo will NOT work with the GY240 or the GY401 gyros.