Robbe FS-122

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*Based on known specs.

Technical Specifications

Last Updated: 2026-10-26

Identity
Brand
Product Number	9113
Category	Hobby
Discontinued	Yes
Performance
Torque	8.4V 91.66 oz-in 5.0V 52.77 oz-in Below Average
Speed	8.4V 0.10 sec/60° 5.0V 0.18 sec/60° Below Average
Physical
Weight	0.74 ozAverage
Dimensions	L 0.98 in W 0.31 in H 1.35 in
Case Material	Aluminum
Drivetrain
Gears	Metal
Gear Spline/Teeth	25 T
Rotation/Support	Dual Bearings
Control & Signal
Modulation	Digital
Electrical & Environment
Operating Voltage	5–8.4 V
Connectivity
Connector	JR (Universal)
Origin
Country of Origin	Austria

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Compatible Hardware

Amazon eBay

*Based on known specs.

Class Comparison

Torque	Below Average Stronger than 33% of 40 Digital Slim servos at 5.0V
Speed	Below Average Faster than 13% of 41 Digital Slim servos at 5.0V
Weight	Average Lighter than 60% of 83 Digital Slim servos

Performance Analysis

Shaft Power	0.54–1.69 W
Power Density	4.132 W/in³ More power-dense than 59% of 83 Digital Slim servos
Torque Density	2.5129 oz-in/g Stronger than 18% of 40 Digital Slim servos
Torque-to-Volume Ratio	128.67 oz-in/in³ Denser torque than 59% of 40 Digital Slim servos
Speed-to-Weight	0.26455 (1/sec·g) Faster than 40% of 41 Digital Slim servos
Speed-Torque Trade-off	9.50 Better balanced than 56% of 40 Digital Slim servos
Torque Gain per Volt	21.68%/V 2nd-highest torque gain per volt of 33 Digital Slim servos
Speed Gain per Volt	23.53%/V More voltage-responsive (speed) than 85% of 34 Digital Slim servos
Voltage Range Width	3.4 V Wider voltage range than 64% of 75 Digital Slim servos