Robbe FS 31

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Technical Specifications

Last Updated: 2026-11-05

Identity
Brand
Product Number	8449
Category	Hobby
Performance
Torque	6.0V 15.28 oz-in 4.8V 12.50 oz-in Above Average
Speed	6.0V 0.18 sec/60° 4.8V 0.20 sec/60° Bottom 10%
Physical
Weight	0.17 ozBelow Average
Dimensions	L 0.669 in W 0.315 in H 0.866 in
Case Material	Aluminum
Drivetrain
Gears	Plastic
Gear Spline/Teeth	15 T
Rotation/Support	Bushing
Control & Signal
Modulation	Analog
Control System	PWM
Electrical & Environment
Operating Voltage	4.8–7.4 V
Power Source	2S LiPo
Water Rating	IP56/67
Connectivity
Connector	JR (Universal) estimate
Origin
Country of Origin	Austria

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Compatible Hardware

Amazon eBay

*Based on known specs.

Class Comparison

Torque	Above Average Stronger than 75% of 29 Analog Nano servos at 4.8V
Speed	Bottom 10% Faster than 0% of 29 Analog Nano servos at 4.8V
Weight	Below Average Lighter than 24% of 67 Analog Nano servos

Performance Analysis

Shaft Power	0.12–0.16 W
Power Density	0.860 W/in³ More power-dense than 48% of 66 Analog Nano servos
Torque Density	2.6596 oz-in/g Stronger than 79% of 29 Analog Nano servos
Torque-to-Volume Ratio	68.49 oz-in/in³ Denser torque than 61% of 29 Analog Nano servos
Speed-to-Weight	1.06383 (1/sec·g) Faster than 7% of 29 Analog Nano servos
Speed-Torque Trade-off	2.50 3rd-highest speed-torque trade-off of 29 Analog Nano servos
Voltage Range Width	2.6 V 3rd-highest voltage range width of 41 Analog Nano servos