Futaba Gyro Piezo GY520 (AVCS)The brand new GY520 gyro is the smallest and lightest helicopter heading hold gyro available! It may be small, it may be light, weighing only 10grams complete, but it performs brilliantly, no matter whether in . 90 size 3D aerobatic heli or a micro electric, all the time consuming about 10% of the power other gyros require and being able to operate with both digital and analogue servos. The GY520 combines the superb tail holding power of the AVCS