Robbe FS-525

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Technical Specifications

Last Updated: 2026-07-28

Identity
Brand
Product Number	26.99
Category	Hobby
Performance
Torque	8.4V 319.47 oz-in 6.0V 266.69 oz-in Average
Speed	8.4V 0.15 sec/60° 6.0V 0.17 sec/60° Below Average
Physical
Weight	2.19 ozAverage
Dimensions	L 1.594 in W 0.795 in H 1.496 in
Case Material	Aluminum
Drivetrain
Gears	Metal
Gear Spline/Teeth	25 T
Rotation/Support	Dual Bearings
Control & Signal
Modulation	Digital
Electrical & Environment
Operating Voltage	6–8.4 V
Connectivity
Connector	JR (Universal) estimate
Origin
Country of Origin	German

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Compatible Hardware

Amazon eBay

*Based on known specs.

Class Comparison

Torque	Average Stronger than 60% of 1043 Digital Standard servos at 6.0V
Speed	Below Average Faster than 24% of 1041 Digital Standard servos at 6.0V
Weight	Average Lighter than 53% of 1902 Digital Standard servos

Performance Analysis

Shaft Power	2.90–3.94 W
Power Density	2.077 W/in³ More power-dense than 46% of 1759 Digital Standard servos
Torque Density	4.3015 oz-in/g Stronger than 66% of 1036 Digital Standard servos
Torque-to-Volume Ratio	140.68 oz-in/in³ Denser torque than 60% of 1042 Digital Standard servos
Speed-to-Weight	0.09488 (1/sec·g) Faster than 29% of 1033 Digital Standard servos
Speed-Torque Trade-off	45.34 Better balanced than 71% of 1031 Digital Standard servos
Torque Gain per Volt	8.25%/V More voltage-responsive (torque) than 13% of 850 Digital Standard servos
Speed Gain per Volt	5.56%/V More voltage-responsive (speed) than 3% of 871 Digital Standard servos
Voltage Range Width	2.4 V Wider voltage range than 53% of 1539 Digital Standard servos