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Name：8.5V20kg-cm Digital Servo;
Size :A：40.2mm B：20.1mm C：38.8mm D：48.0mm E：10mm; Weight:56g ±0.2（1.46oz);
Gear type:Titanium Gear;
Speed:0.16sec/60º at (7.4V)
0.14sec/60º at (8.5V)
Torque:17.8kg.cm.at(7.4V)
21.0kg.cm.at(8.5V)
Digital servos features: Support high voltage;Waterproof; Plastic case, resist heat and corrosion; Aluminium middle hull, easy to eliminate heat;Adopt high quality coreless motor.
7.4V High voltage digital servo XQ-S4120D,popular rc servo for 600 helicopter