Robbe FS 40

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*Spec is estimated from brand data.

Technical Specifications

Last Updated: 2026-10-09

Identity
Brand
Product Number	8433
Category	Hobby
Discontinued	Yes
Performance
Torque	6.0V 21.24 oz-in 4.8V 16.99 oz-in Above Average
Speed	6.0V 0.16 sec/60° 4.8V 0.20 sec/60° Bottom 10%
Physical
Weight	0.32 ozBelow Average
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	Above Average Stronger than 86% of 29 Nano servos at 4.8V
Speed	Bottom 10% Faster than 4% of 29 Nano servos at 4.8V
Weight	Below Average Lighter than 15% of 27 Analog Nano servos

Performance Analysis

Shaft Power	0.16–0.25 W
Power Density	0.794 W/in³ More power-dense than 42% of 27 Analog Nano servos
Torque Density	1.8880 oz-in/g Stronger than 39% of 42 Robbe servos
Torque-to-Volume Ratio	54.94 oz-in/in³ Denser torque than 43% of 43 Robbe servos
Speed-to-Weight	0.55556 (1/sec·g) Faster than 55% of 41 Robbe servos
Speed-Torque Trade-off	3.40 Better balanced than 39% of 42 Robbe servos
Torque Gain per Volt	20.83%/V More voltage-responsive (torque) than 70% of 34 Robbe servos
Speed Gain per Volt	20.83%/V More voltage-responsive (speed) than 66% of 33 Robbe servos
Voltage Range Width	1.2 V Wider voltage range than 38% of 51 Robbe servos