Robbe FS-166HV

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Technical Specifications

Last Updated: 2026-10-26

Identity
Brand
Product Number	9123
Category	Hobby
Performance
Torque	7.4V 38.89 oz-in 6.6V 34.73 oz-in 6.0V 31.95 oz-in Bottom 10%
Speed	7.4V 0.10 sec/60° 6.6V 0.12 sec/60° 6.0V 0.13 sec/60° Above 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 Mode	Positional
Control & Signal
Modulation	Digital
Rotational Range	120°
Electrical & Environment
Operating Voltage	6–8.4 V
Connectivity
Connector	JR (Universal) estimate
Origin
Country of Origin	German

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*Based on known specs.

Class Comparison

Torque	Bottom 10% Stronger than 8% of 40 Digital Slim servos at 6.0V
Speed	Above Average Faster than 73% of 41 Digital Slim servos at 6.0V
Weight	Above Average Lighter than 84% of 83 Digital Slim servos

Performance Analysis

Shaft Power	0.45–0.72 W
Power Density	2.131 W/in³ More power-dense than 32% of 83 Digital Slim servos
Torque Density	2.6189 oz-in/g Stronger than 28% of 40 Digital Slim servos
Torque-to-Volume Ratio	94.69 oz-in/in³ Denser torque than 21% of 40 Digital Slim servos
Speed-to-Weight	0.63052 (1/sec·g) 5th-highest speed-to-weight of 41 Digital Slim servos
Speed-Torque Trade-off	4.15 Better balanced than 5% of 40 Digital Slim servos
Voltage Range Width	2.4 V Wider voltage range than 36% of 75 Digital Slim servos