Blue Arrow Air-Heli1904SG-I

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*Based on known specs.

Technical Specifications

Last Updated: 2026-07-10

Identity
Brand
Category	Hobby
Performance
Torque	7.4V 263.91 oz-in 6.0V 194.46 oz-in
Speed	7.4V 0.05 sec/60° 6.0V 0.06 sec/60°
Stall Current	4–5 ABelow Average
Physical
Weight	2.47 ozBelow Average
Dimensions	L 1.57 in W 0.79 in H 1.43 in
Case Material	Aluminum
Drivetrain
Motor Type	Brushless
Gears	Titanium
Rotation/Support	Dual Bearings
Control & Signal
Modulation	Digital
Direction	Clockwise
Rotational Range	60°
Mechanical Limit	120°
Pulse Width	450-1050 µs
Neutral Position	760 µs
Dead Band	1 µs
Refresh Rate	660 Hz
Angle Sensor	Induction Encoder
Control System	PWM
Electrical & Environment
Operating Voltage	4.5–8.4 V
Temperature	-20–70 °C
Connectivity
Connector	JR (Universal)
Wire Length	260 mm
Origin
Country of Origin	China

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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

Weight	Below Average Lighter than 33% of 1902 Digital Standard servos
Stall Current	Below Average Lower draw than 24% of 539 Digital Standard servos

Performance Analysis

Shaft Power	5.99–9.76 W
Power Density	5.503 W/in³ More power-dense than 81% of 1759 Digital Standard servos
Torque Density	2.7780 oz-in/g
Torque-to-Volume Ratio	109.64 oz-in/in³
Speed-to-Weight	0.23810 (1/sec·g)
Speed-Torque Trade-off	11.67
Current-per-Torque Ratio	0.0257 A/oz-in
Voltage Range Width	3.9 V Wider voltage range than 90% of 1539 Digital Standard servos
Dead-Band-to-Pulse-Width Ratio	0.0017 Finer dead band than 42% of 468 Digital Standard servos