Graupner C 131

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*Spec is estimated from brand data.

Technical Specifications

Last Updated: 2026-10-23

Identity
Brand
Product Number	7121
Category	Hobby
Discontinued	Yes
Performance
Torque	6.0V 18.40 oz-in 4.8V 8.50 oz-in Below Average
Speed	6.0V 0.07 sec/60° 4.8V 0.09 sec/60° Above Average
Physical
Weight	0.21 ozAverage
Dimensions	L 0.787 in W 0.433 in H 0.827 in
Drivetrain
Gears	Plastic
Gear Spline/Teeth	23 T estimate
Rotation/Support	Bushing
Control & Signal
Modulation	Analog
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	Below Average Stronger than 20% of 36 Nano servos at 4.8V
Speed	Above Average Faster than 66% of 36 Nano servos at 4.8V
Weight	Average Lighter than 35% of 32 Analog Nano servos

Performance Analysis

Shaft Power	0.17–0.51 W
Power Density	1.809 W/in³ More power-dense than 83% of 31 Analog Nano servos
Torque Density	1.4160 oz-in/g Stronger than 18% of 84 Graupner servos
Torque-to-Volume Ratio	30.13 oz-in/in³ Denser torque than 7% of 84 Graupner servos
Speed-to-Weight	1.78635 (1/sec·g) 4th-highest speed-to-weight of 82 Graupner servos
Speed-Torque Trade-off	0.79 Better balanced than 5% of 81 Graupner servos
Torque Gain per Volt	97.14%/V 2nd-highest torque gain per volt of 54 Graupner servos
Speed Gain per Volt	33.24%/V 1st-highest speed gain per volt of 50 Graupner servos
Voltage Range Width	1.2 V Wider voltage range than 63% of 100 Graupner servos