Futaba GY440 Gyro Mems Aero Single Output (AVCS)The GY440 is a micro gyro from Futaba has been designed specifically to be used on helicopter tail servos, but it can also be used in other functions such as performance boat rudders. This GY440 is both easy to use and set up with an informative instruction sheet to guide you through the process. The design is lightweight allowing you to use it on almost any size of helicopter and compact enough to fit in tight locations. There is a trim pot to adjust