JR DS3781

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*Based on known specs.

Technical Specifications

Last Updated: 2026-10-26

Identity
Brand
Product Number	GRP-5161
Category	Hobby
Discontinued	Yes
Performance
Torque	6.0V 49.56 oz-in 4.8V 42.48 oz-in Below Average
Speed	6.0V 0.09 sec/60° 4.8V 0.11 sec/60° Average
Physical
Weight	0.99 ozAverage
Dimensions	L 1.299 in W 0.591 in H 1.063 in
Drivetrain
Motor Type	Coreless
Motor Drive	MOS
Gears	Metal
Rotation/Support	Dual Bearings
Control & Signal
Modulation	Digital
Electrical & Environment
Operating Voltage	4.8–6 V
Idle Current	0.016 A
Connectivity
Connector	JR (Universal)
Wire Length	100 mm

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Compatible Hardware

Amazon eBay

*Based on known specs.

Class Comparison

Torque	Below Average Stronger than 29% of 290 Digital Mini servos at 4.8V
Speed	Average Faster than 60% of 293 Digital Mini servos at 4.8V
Weight	Average Lighter than 37% of 505 Digital Mini servos

Performance Analysis

Shaft Power	0.75–1.02 W
Power Density	1.248 W/in³ More power-dense than 32% of 482 Digital Mini servos
Torque Density	1.5171 oz-in/g Stronger than 17% of 286 Digital Mini servos
Torque-to-Volume Ratio	52.05 oz-in/in³ Denser torque than 24% of 288 Digital Mini servos
Speed-to-Weight	0.34014 (1/sec·g) Faster than 56% of 289 Digital Mini servos
Speed-Torque Trade-off	4.46 Better balanced than 26% of 288 Digital Mini servos
Torque Gain per Volt	13.89%/V More voltage-responsive (torque) than 30% of 257 Digital Mini servos
Speed Gain per Volt	13.90%/V More voltage-responsive (speed) than 34% of 262 Digital Mini servos
Voltage Range Width	1.2 V Wider voltage range than 31% of 405 Digital Mini servos