Futaba S9251 Metal Gear Servo for GY601/GY611  [S9251]

Futaba S9251 - Digital Servo (57g/0.07sec/3.7kg)
Price:
AUD$174.35
Brand:
Futaba
Model:
S9251
Condition:
Brand New
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Accurate Helicopter Control Using Futaba S9251

The Futaba S9251 digital servo is intended to perform alongside GY601 and GY611 gyros, giving pilots precise control authority. Its frame refresh characteristics are tuned to support stable gyro correction during flight.

Electrical and Timing Notes

Because the S9251 matches the frame refresh profile expected by the GY601, it is the recommended option for that gyro. Operate at the advised 4.8V to avoid compromising gyro operation.

Technical Specifications

  • Modulation: Digital
  • Torque: 4.8V: 51.0 oz-in (3.67 kg-cm)
  • Speed: 4.8V: 0.07 sec/60°
  • Weight: 2.01 oz (57.0 g)
  • External Dimensions: 1.57 x 0.79 x 1.46 in (39.9 x 20.1 x 37.1 mm)
  • Motor Type: Coreless
  • Gear Type: Metal
  • Bearings: Dual bearings

When paired with GY601 or GY611 gyros, the Futaba S9251 delivers the precise motion control needed for accurate helicopter trims.

Do I need a specific transmitter setting?

No special transmitter protocol is required, but confirm endpoint and subtrim settings to match travel and centre position for the GY601 or GY611.

How should I mount the servo to reduce vibration?

Use firm but cushioned mounting points, avoid direct contact with vibrating metal parts, and secure linkages with low-slop hardware to keep feedback consistent.

Can I upgrade the S9251 internals?

The S9251 already uses a coreless motor and metal gears; internal modification is generally unnecessary and can void intended gyro compatibility.

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