Graupner C 131

Search Amazon Search eBay

Compatible Hardware

Amazon eBay

*Spec is estimated from brand data.

Technical Specifications

Last Updated: 2026-10-09

Identity
Brand
Product Number	7121
Category	Hobby
Discontinued	Yes
Performance
Torque	6.0V 9.91 oz-in 4.8V 8.50 oz-in Below Average
Speed	6.0V 0.07 sec/60° 4.8V 0.09 sec/60° Average
Physical
Weight	0.21 ozBelow Average
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

Submit Missing Data Report an Error

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 32% of 29 Nano servos at 4.8V
Speed	Average Faster than 61% of 29 Nano servos at 4.8V
Weight	Below Average Lighter than 27% of 27 Analog Nano servos

Performance Analysis

Shaft Power	0.17–0.27 W
Power Density	0.975 W/in³ More power-dense than 50% of 27 Analog Nano servos
Torque Density	1.4160 oz-in/g Stronger than 18% of 73 Graupner servos
Torque-to-Volume Ratio	30.13 oz-in/in³ Denser torque than 6% of 73 Graupner servos
Speed-to-Weight	1.78635 (1/sec·g) 4th-highest speed-to-weight of 73 Graupner servos
Speed-Torque Trade-off	0.79 Better balanced than 7% of 72 Graupner servos
Torque Gain per Volt	13.89%/V More voltage-responsive (torque) than 28% of 41 Graupner servos
Speed Gain per Volt	33.24%/V 1st-highest speed gain per volt of 41 Graupner servos
Voltage Range Width	1.2 V Wider voltage range than 58% of 90 Graupner servos