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 18% of 186 Digital Low Profile servos at 4.8V
Speed	Below Average Faster than 14% of 183 Digital Low Profile servos at 4.8V
Weight	Above Average Lighter than 79% of 304 Digital Low Profile servos

Performance Analysis

Shaft Power	1.29–2.05 W
Power Density	1.645 W/in³ More power-dense than 15% of 273 Digital Low Profile servos
Torque Density	2.1778 oz-in/g Stronger than 20% of 185 Digital Low Profile servos
Torque-to-Volume Ratio	78.62 oz-in/in³ Denser torque than 25% of 186 Digital Low Profile servos
Speed-to-Weight	0.15873 (1/sec·g) Faster than 22% of 182 Digital Low Profile servos
Speed-Torque Trade-off	13.72 Better balanced than 46% of 183 Digital Low Profile servos
Torque Gain per Volt	20.41%/V More voltage-responsive (torque) than 77% of 164 Digital Low Profile servos
Speed Gain per Volt	22.73%/V More voltage-responsive (speed) than 88% of 163 Digital Low Profile servos
Voltage Range Width	1.2 V Wider voltage range than 17% of 276 Digital Low Profile servos