KO Propo BSx4S-one10

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*Based on known specs.

Technical Specifications

Last Updated: 2026-07-10

Identity
Brand
Product Number	30219
Category	Hobby
Discontinued	Yes
Performance
Torque	7.4V 222.24 oz-in 6.0V 168.07 oz-in Above Average
Speed	7.4V 0.09 sec/60° 6.0V 0.11 sec/60° Below Average
Physical
Weight	1.80 ozAverage
Dimensions	L 1.594 in W 0.827 in H 1.024 in
Case Material	Aluminum
Drivetrain
Motor Type	Brushless
Gears	Metal
Rotation/Support	Dual Bearings
Control & Signal
Control System	PWM
Programmable	Yes
Electrical & Environment
Operating Voltage	6–7.4 V
Power Source	LiPo / LiFe / Ni-MH
Connectivity
Connector	Futaba J
Wire Length	180 mm
Origin
Country of Origin	Japan

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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

*Based on known specs.

Class Comparison

Torque	Above Average Stronger than 72% of 177 Low Profile servos at 6.0V
Speed	Below Average Faster than 31% of 175 Low Profile servos at 6.0V
Weight	Average Lighter than 40% of 358 Low Profile servos

Performance Analysis

Shaft Power	2.83–4.57 W
Power Density	3.382 W/in³ More power-dense than 89% of 112 KO Propo servos
Torque Density	3.2955 oz-in/g Stronger than 54% of 38 KO Propo servos
Torque-to-Volume Ratio	124.51 oz-in/in³ Denser torque than 57% of 38 KO Propo servos
Speed-to-Weight	0.17825 (1/sec·g) Faster than 41% of 38 KO Propo servos
Speed-Torque Trade-off	18.49 Better balanced than 65% of 38 KO Propo servos
Torque Gain per Volt	23.02%/V 3rd-highest torque gain per volt of 29 KO Propo servos
Speed Gain per Volt	15.87%/V More voltage-responsive (speed) than 79% of 29 KO Propo servos
Voltage Range Width	1.4 V 5th-highest voltage range width of 38 KO Propo servos