Futaba S3155 Digital High-Speed Slim Wing Servo  [S3155]

Wing Servo Technical Summary

The Futaba S3155 is a digital high-speed slim servo built for wing-mounted control surfaces on small gliders, jets and electric model aircraft where installation depth is limited. Its compact black plastic case combined with FUTM3331 metal gears offers a space-saving fit while delivering the quick response expected from a high-speed servo.

When fitting the S3155, allow for its electrical demand at startup and under load. Use battery packs and wiring that can supply peak current, avoid long lead runs and Y-harnesses when possible, and ensure pushrods and hinge linkages move freely to reduce unnecessary current draw and wear.

For wing installations prioritise a clean mechanical layout and a power system capable of sustained high-current delivery; shorten leads and avoid Y-harnesses where practical, and use the included horn selection to set control throw and centring during final setup.