Futaba S9151 Precision High-Torque Digital Servo for F3A  [S9151]

Futaba S9151 Servo Digital Rudder
Price:
CAD$113.71
Brand:
Futaba
Model:
S9151
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Accurate Rudder Response from Futaba S9151

The Futaba S9151 digital servo is a purpose-built, high-performance unit for fixed-wing F3A pattern aircraft. Built to provide strong torque and quick movement, this servo delivers the control accuracy needed for tight rudder work in sport and competition flying.

Key Performance Details

Using advanced digital processing, the S9151 shortens the delay between transmitter input and servo movement to give immediate, consistent control feel. Its coreless motor design, where a wire cage spins within the magnetic field, produces smooth high-speed rotation. Twin ball bearings on the output shaft improve longevity and reduce friction under load.

Specifications

  • Dimensions: 41mm (L) x 20mm (W) x 38mm (H)
  • Weight: 50g
  • Speed: 0.19 sec/60° @ 4.8V
  • Torque: 132 oz/in (9.5 kg/cm) @ 4.8V
  • Power Supply: 4.8V (Not recommended for use with 6V)

For pilots focused on precise rudder trimming and reliable control, the Futaba S9151 brings repeatable torque and a robust build suitable for serious F3A setups.

The manufacturer advises using 4.8V for this servo. Using 6V is not recommended as it can change performance characteristics and may risk damage.
A light alloy or reinforced plastic horn with a secure spline fit is ideal. Choose a horn that allows fine throw adjustments without introducing slop in the linkage.
Check pushrod straightness, use ball links where possible, and centre the servo before installing the horn. Small misalignments are the main cause of load on the motor.
Inspect the output spline and bearings periodically, keep connections clean, and avoid exposing the servo to moisture and grit to extend service life.

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