Blue Bird BMS-303

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*Spec is estimated from brand data.

Technical Specifications

Last Updated: 2026-10-22

Identity
Brand
Product Number	BMS-303
Category	Hobby
Discontinued	Yes
Performance
Torque	4.8V9.91 oz-inAbove Average
Speed	4.8V0.11 sec/60°Above Average
Physical
Weight	0.13 ozAverage
Dimensions	L 0.75 in W 0.29 in H 0.61 in
Drivetrain
Motor Type	Coreless
Gears	Plastic
Gear Spline/Teeth	25 T estimate
Control & Signal
Modulation	Analog
Electrical & Environment
Operating Voltage	4.8–4.8 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	Above Average Stronger than 68% of 29 Analog Nano servos at 4.8V
Speed	Above Average Faster than 71% of 29 Analog Nano servos at 4.8V
Weight	Average Lighter than 62% of 67 Analog Nano servos

Performance Analysis

Shaft Power	0.17 W
Power Density	1.290 W/in³ More power-dense than 74% of 66 Analog Nano servos
Torque Density	2.6784 oz-in/g 5th-highest torque density of 29 Analog Nano servos
Torque-to-Volume Ratio	74.69 oz-in/in³ Denser torque than 71% of 29 Analog Nano servos
Speed-to-Weight	2.52589 (1/sec·g) 3rd-highest speed-to-weight of 29 Analog Nano servos
Speed-Torque Trade-off	1.06 Better balanced than 61% of 29 Analog Nano servos
Voltage Range Width	0.0 V Wider voltage range than 13% of 41 Analog Nano servos