Futaba GY401+S9257 Helicopter Gyro and S9257 Tail Servo Pack  [GY401+S9257]

Compact GY401 AVCS gyro and S9257 servo details

The Futaba GY401 AVCS gyro combined with the S9257 standard servo forms a compact control solution aimed at electric RC helicopters. The AVCS system, using SMM sensor tech, helps hold heading and reduce trim drift, while the S9257 delivers a conventional standard-voltage servo output for tail duties or small control surfaces.

Built for model use, the gyro contains sensor and control circuitry within a conductive resin case to improve electromagnetic compatibility, and it allows remote gain adjustment and mode switching via a compatible transmitter. When paired with a Futaba digital servo the DS mode keeps high-speed response characteristics.

Fitment tips: the gyro's small dimensions and supplied mounting pads make installation inside common electric helicopter fuselages straightforward, and remote gain control permits field tuning without extensive disassembly. The S9257 follows industry-standard wiring and voltage ranges for easy integration with Futaba receivers.

This Futaba GY401+S9257 set is suitable for pilots wanting a small, heading-hold gyro with transmitter tuning and a reliable standard servo for tail installation; always set gain and wiring according to your helicopter's configuration.