Futaba S9551 Compact Digital Servo - Precision Aileron and Car Control  [S9551]

Futaba S9551 Low Profile Digital High Speed/Torq Servo
Price:
NZD$140.99
Brand:
Futaba
Model:
S9551
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High Responsiveness from Futaba S9551

The Futaba S9551 Low Profile Digital Servo is designed for crisp, repeatable control in tight installations. Its low height and compact footprint let you tuck it into wings and slim car bays without compromising throw or reliability.

Performance Highlights

  • Coreless Motor: Reduced inertia gives sharper centring and faster transient response compared with conventional motors.
  • Metal Gears: Robust gearing that stands up to repeated high-load use.
  • Dual Ball Bearings: Provides steady, low-friction operation for consistent feel.
  • Dust and Water Resistant: Basic sealing protects against dust and light moisture but is not a substitute for waterproof servos.

Specifications

  • Speed: 0.14 sec/60° at 4.8V; 0.11 sec/60° at 6.0V
  • Torque: 98 oz-in (7.0 kg-cm) at 4.8V; 122 oz-in (8.8 kg-cm) at 6.0V
  • Weight: 1.6 oz (45 g)
  • Dimensions: 1.6 x 0.8 x 1.0 inches (41 x 20 x 25 mm)
  • Mounting Hole Centers: 0.39 inches (10 mm)
  • Horn Screw Size: 3x8 mm

A good choice for pilots and drivers who need precise control in confined spaces, the Futaba S9551 balances speed and torque for a range of RC roles.

Yes, its quick response and firm torque make it suitable for aileron control in precision aerobatic setups, provided the servo travel and mounting suit your model.
A standard transmitter with trim or a bench servo tester will allow you to centre and check endpoints before final installation.
Use light, stiff pushrods and properly sized horns to avoid flex and to make the most of the servo's precise feedback.
The seals help against dust and splashes, but you should avoid prolonged exposure to heavy rain or immersion since the unit is not fully waterproof.

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