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

Technical overview

The Futaba S3155 is a digital high-speed slim servo designed for wing-mounted control surfaces on small gliders, jets and electric model aircraft where installation depth is limited. Its compact plastic case and metal gear train make it suitable for confined wing bays while delivering the quick response expected from a high-speed unit.

Installers should plan for the servo's electrical demands, as the unit can draw significant current at startup and under load. Use supply batteries and wiring capable of delivering the required amps, avoid long lead runs and Y-harnesses when possible, and verify pushrod and hinge linkages are free from binding to reduce unnecessary current draw and wear.

For wing installations prioritize a clean mechanical setup 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 dial in control throw and centring during final setup.