KO Propo RSx4S-Response

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*Spec is estimated from brand data.

Technical Specifications

Last Updated: 2026-10-25

Identity
Brand
Product Number	30144
Category	Hobby
Performance
Torque	8.4V 269.66 oz-in 7.4V 244.42 oz-in 6.0V 201.37 oz-in Average
Speed	8.4V 0.06 sec/60° 7.4V 0.06 sec/60° 6.0V 0.07 sec/60° Top 10%
Physical
Weight	2.66 ozBelow Average
Dimensions	L 1.591 in W 1.476 in H 0.787 in
Case Material	Aluminum
Drivetrain
Motor Type	Coreless
Gears	Stainless Steel
Gear Spline/Teeth	23 T estimate
Rotation/Support	Dual Bearings
Control & Signal
Control System	HCS / PWM
Programmable	Yes
Electrical & Environment
Operating Voltage	6–7.4 V
Power Source	LiPo / LiFe / Ni-MH
Connectivity
Wire Length	230 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

*Spec is estimated from brand data.

Class Comparison

Torque	Average Stronger than 54% of 1307 Standard servos at 6.0V
Speed	Top 10% Faster than 92% of 1289 Standard servos at 6.0V
Weight	Below Average Lighter than 16% of 2491 Standard servos

Performance Analysis

Shaft Power	5.32–8.31 W
Power Density	4.496 W/in³ 3rd-highest power density of 112 KO Propo servos
Torque Density	2.6742 oz-in/g Stronger than 19% of 37 KO Propo servos
Torque-to-Volume Ratio	108.96 oz-in/in³ Denser torque than 50% of 37 KO Propo servos
Speed-to-Weight	0.18972 (1/sec·g) Faster than 44% of 37 KO Propo servos
Speed-Torque Trade-off	14.10 Better balanced than 39% of 37 KO Propo servos
Torque Gain per Volt	15.27%/V More voltage-responsive (torque) than 68% of 29 KO Propo servos
Speed Gain per Volt	11.91%/V More voltage-responsive (speed) than 54% of 29 KO Propo servos
Voltage Range Width	1.4 V 5th-highest voltage range width of 38 KO Propo servos