Futaba S3115 Micro Precision Servo — lightweight micro servo for precision control  [S3115]

Futaba S3115 Micro Precision Servo
Price:
AUD$45.43
Brand:
Futaba
Model:
S3115
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Small-form precision: Futaba S3115

The Futaba S3115 is a micro precision servo designed for RC electric models where space and weight are limited. With a compact case and nylon geartrain, it delivers measured movement for small control surfaces and cyclic inputs in micro aircraft. Installation is simple: secure the servo in the recommended bay, attach the supplied horn that suits your linkage, and route the lead to the receiver.

Observe the servo's electrical and mechanical limits. It is intended for battery-powered electric models and can draw notable current under heavy load, so confirm your battery and BEC/ESC supply peak demand. This servo is not intended for sustained high-torque applications; excessive load or overvoltage will shorten service life.

Contents of the package

  • Futaba S3115 Micro Precision Servo - 1 pcs
  • 1" (25.4mm) 4-arm servo horn, installed - 1 pcs
  • 1.5" (39mm) 4-arm servo horn - 1 pcs
  • 1.75" (45mm) straight servo horn - 1 pcs
  • 1.4" (35mm) diameter round servo horn - 1 pcs
  • Eyelets - 2 pcs
  • Rubber grommets - 2 pcs
  • 2x12mm washer head self-threading screws (Phillips) - 2 pcs

Specifications

  • Item Futaba S3115 Micro Precision Servo
  • Material Nylon gear train
  • Model Number S3115
  • Compatibility Small electric planes and micro helicopters
  • Torque (4.8V) 39 oz-in (2.8 kg/cm)
  • Speed (4.8V) 0.15 sec/60
  • Dimensions 1.1 x 0.5 x 1.2" (28 x 13 x 30 mm)
  • Weight 0.60 oz (17 g)
  • Lead Length 6.5" (165 mm)

Use the supplied horns and mounting hardware, keep operating voltage within the recommended range, and do not fit this servo in gas or high-power engine models or large gliders; for gear replacement order part FUTM3404.

What are the best tuning practices for the S3115 in micro planes?

Use minimal control throws appropriate for small surfaces, apply smooth expo to prevent abrupt movements, and verify endpoint settings in your transmitter to avoid overtravel that can stress the nylon gears.

Is it safe to run the S3115 from a common LiPo pack?

Yes, provided your battery and BEC/ESC can supply peak current without significant voltage sag. Check voltage under load and protect against overvoltage to preserve servo life.

Which horn comes preinstalled and what alternatives are included?

The 1" (25.4mm) 4-arm horn is installed at shipment. The pack also contains a 1.5" 4-arm horn, a 1.75" straight horn, and a 1.4" round horn to suit different link geometries.

Can I use the S3115 in larger, higher-power aircraft?

No. The S3115 is not intended for gas engines, high-power setups, or any application requiring continuous high torque. Choose a metal-gear, higher-torque servo for those uses.

Who should I contact for gear replacement and what part do I need?

Replacement internal gears are available as part number FUTM3404; follow the manufacturer's servicing guidance when replacing gears to ensure correct fit and avoid damage.

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