Futaba GY401+S9257 AVCS Gyro + S9257 Standard Servo for RC Helicopters  [GY401+S9257]

GY401 AVCS heading-hold gyro with S9257 servo

The Futaba GY401 AVCS gyro combined with the S9257 standard servo is offered as a compact control package for electric RC helicopters. The AVCS design utilises SMM sensor technology to limit trim drift and preserve heading, while the S9257 supplies a compact standard-voltage servo option for tail or minor control surfaces.

This combination is intended for model use: the gyro integrates sensor and control electronics within a conductive resin case to help with EMC immunity, and it supports remote gain adjustment and mode selection from a compatible transmitter. When a Futaba digital servo is used, DS mode is available to retain high-speed response characteristics.

Fit and tuning: the gyro's compact size and included mounting pads simplify fitting into common electric helicopter fuselages, and remote gain adjustments allow tuning on the bench or at the flying field. The S9257 is compatible with standard receiver wiring and voltage ranges for straightforward connection.

Pilots seeking a compact heading-hold gyro with remote tuning and a conventional standard servo for tail installations will find the Futaba GY401+S9257 a practical matched option; adjust gain and wiring to suit your model and transmitter.