Robbe FS-166

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*Based on known specs.

Technical Specifications

Last Updated: 2026-10-26

Identity
Brand
Product Number	9105
Category	Hobby
Performance
Torque	6.0V 38.89 oz-in 4.8V 33.34 oz-in Below Average
Speed	6.0V 0.10 sec/60° 4.8V 0.14 sec/60° Average
Physical
Weight	0.43 ozAbove Average
Dimensions	L 0.91 in W 0.36 in H 1.03 in
Case Material	Plastic
Drivetrain
Gears	Metal
Gear Spline/Teeth	21 T
Rotation/Support	Single Bearing
Control & Signal
Modulation	Digital
Electrical & Environment
Operating Voltage	4.8–6 V
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	Below Average Stronger than 10% of 40 Digital Slim servos at 4.8V
Speed	Average Faster than 60% of 41 Digital Slim servos at 4.8V
Weight	Above Average Lighter than 83% of 83 Digital Slim servos

Performance Analysis

Shaft Power	0.44–0.72 W
Power Density	2.131 W/in³ More power-dense than 30% of 83 Digital Slim servos
Torque Density	2.7328 oz-in/g Stronger than 44% of 40 Digital Slim servos
Torque-to-Volume Ratio	98.81 oz-in/in³ Denser torque than 26% of 40 Digital Slim servos
Speed-to-Weight	0.58548 (1/sec·g) Faster than 85% of 41 Digital Slim servos
Speed-Torque Trade-off	4.67 Better balanced than 10% of 40 Digital Slim servos
Torque Gain per Volt	13.87%/V More voltage-responsive (torque) than 22% of 33 Digital Slim servos
Speed Gain per Volt	33.33%/V 1st-highest speed gain per volt of 34 Digital Slim servos
Voltage Range Width	1.2 V Wider voltage range than 8% of 75 Digital Slim servos