Main blade diameter: 680mm Tail blade diameter: 130mm Length: 650mm Height: 230mm Motor: 400-450 brushless motor Suggested 12-13 tooth for 400 motor, and 10 tooth for 450 motor Rotate ratio:12:140/110:22 25A brushless speed controller ESKY professional gyro Servo:8g Tail rotor drive Belt System 20C 1800mAh LI-PO battery CCPM Hold System Auto-rotation System Tail rotor belt drive system High inertial main blade High rigidity Iron main shaft shock proof Iron landing skids Full ball bearing&metal ball end High rigidity alloy tail boom High strength carbon fibre tail stand