Futaba S9551

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*Spec is estimated from brand data.

Technical Specifications

Last Updated: 2026-09-14

Identity
Brand
Product Number	FUTM0661
Category	Hobby
Discontinued	Yes
Performance
Torque	6.0V 122.00 oz-in 4.8V 98.00 oz-in Below Average
Speed	6.0V 0.11 sec/60° 4.8V 0.14 sec/60° Below Average
Physical
Weight	1.59 ozAbove Average
Dimensions	L 1.61 in W 0.79 in H 0.98 in
Case Material	Plastic
Drivetrain
Motor Type	Coreless
Gears	Metal
Gear Spline/Teeth	25 T estimate
Rotation/Support	Dual Bearings
Control & Signal
Modulation	Digital
Electrical & Environment
Operating Voltage	4.8–6 V
Water Rating	Water Resistant

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Disclaimer: Most data is sourced from the manufacturer. Some data is sourced from our loyal community and with the help of AI. We aim for accuracy but are not responsible for inaccurate information.

Compatible Hardware

Amazon eBay

*Spec is estimated from brand data.

Class Comparison

Torque	Below Average Stronger than 21% of 136 Digital Low Profile servos at 4.8V
Speed	Below Average Faster than 11% of 135 Digital Low Profile servos at 4.8V
Weight	Above Average Lighter than 74% of 251 Digital Low Profile servos

Performance Analysis

Shaft Power	1.29–2.05 W
Power Density	1.645 W/in³ More power-dense than 21% of 215 Digital Low Profile servos
Torque Density	2.1778 oz-in/g Stronger than 22% of 136 Digital Low Profile servos
Torque-to-Volume Ratio	78.62 oz-in/in³ Denser torque than 28% of 136 Digital Low Profile servos
Speed-to-Weight	0.15873 (1/sec·g) Faster than 19% of 135 Digital Low Profile servos
Speed-Torque Trade-off	13.72 Better balanced than 53% of 134 Digital Low Profile servos
Torque Gain per Volt	20.41%/V More voltage-responsive (torque) than 74% of 115 Digital Low Profile servos
Speed Gain per Volt	22.73%/V More voltage-responsive (speed) than 91% of 117 Digital Low Profile servos
Voltage Range Width	1.2 V Wider voltage range than 18% of 223 Digital Low Profile servos