Robbe FS 40

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*Spec is estimated from brand data.

Technical Specifications

Last Updated: 2026-11-05

Identity
Brand
Product Number	8433
Category	Hobby
Discontinued	Yes
Performance
Torque	6.0V 21.24 oz-in 4.8V 16.99 oz-in Average
Speed	6.0V 0.16 sec/60° 4.8V 0.20 sec/60° Bottom 10%
Physical
Weight	0.32 ozAverage
Dimensions	L 0.94 in W 0.35 in H 0.94 in
Drivetrain
Gears	Plastic
Gear Spline/Teeth	25 T estimate
Control & Signal
Modulation	Analog
Control System	PWM
Electrical & Environment
Operating Voltage	4.8–6 V
Connectivity
Connector	JR (Universal) estimate

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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	Average Stronger than 40% of 160 Analog Micro servos at 4.8V
Speed	Bottom 10% Faster than 3% of 160 Analog Micro servos at 4.8V
Weight	Average Lighter than 48% of 336 Analog Micro servos

Performance Analysis

Shaft Power	0.16–0.25 W
Power Density	0.794 W/in³ More power-dense than 44% of 322 Analog Micro servos
Torque Density	1.8880 oz-in/g Stronger than 36% of 160 Analog Micro servos
Torque-to-Volume Ratio	54.94 oz-in/in³ Denser torque than 62% of 160 Analog Micro servos
Speed-to-Weight	0.55556 (1/sec·g) Faster than 17% of 160 Analog Micro servos
Speed-Torque Trade-off	3.40 Better balanced than 80% of 159 Analog Micro servos
Torque Gain per Volt	20.83%/V More voltage-responsive (torque) than 76% of 101 Analog Micro servos
Speed Gain per Volt	20.83%/V More voltage-responsive (speed) than 87% of 101 Analog Micro servos
Voltage Range Width	1.2 V Wider voltage range than 70% of 174 Analog Micro servos