Spektrum S651

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Technical Specifications

Last Updated: 2026-10-08

Identity
Brand
Product Number	SPMS651
Category	Hobby
Performance
Torque	7.4V 103.00 oz-in 7.2V 103.00 oz-in 6.0V 88.00 oz-in Average
Speed	7.4V 0.12 sec/60° 6.0V 0.14 sec/60° Above Average
Physical
Weight	2.12 ozBelow Average
Dimensions	L 1.58 in W 0.79 in H 1.55 in
Drivetrain
Motor Type	DC
Gears	Metal
Gear Spline/Teeth	23 T
Rotation Mode	Positional
Control & Signal
Modulation	Analog
Rotational Range	120°
Control System	PWM
Electrical & Environment
Operating Voltage	6–7.4 V
Water Rating	Waterproof
Connectivity
Connector	JR (Universal)
Wire Length	300 mm

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Compatible Hardware

Amazon eBay

*Based on known specs.

Class Comparison

Torque	Average Stronger than 56% of 192 Analog Standard servos at 6.0V
Speed	Above Average Faster than 81% of 190 Analog Standard servos at 6.0V
Weight	Below Average Lighter than 11% of 448 Analog Standard servos

Performance Analysis

Shaft Power	1.14–1.56 W
Power Density	0.807 W/in³ More power-dense than 70% of 437 Analog Standard servos
Torque Density	1.4667 oz-in/g Stronger than 40% of 192 Analog Standard servos
Torque-to-Volume Ratio	45.48 oz-in/in³ Denser torque than 53% of 192 Analog Standard servos
Speed-to-Weight	0.11655 (1/sec·g) Faster than 54% of 190 Analog Standard servos
Speed-Torque Trade-off	12.58 Better balanced than 45% of 190 Analog Standard servos
Torque Gain per Volt	12.18%/V More voltage-responsive (torque) than 38% of 145 Analog Standard servos
Speed Gain per Volt	12.29%/V More voltage-responsive (speed) than 40% of 147 Analog Standard servos
Voltage Range Width	1.4 V Wider voltage range than 82% of 229 Analog Standard servos