rc helicopter Specification: 1) total length·ª.............390mm 2) total width·ª..............140mm 3) total height:..............165mm 4) total weight·ª.............250g 5) main rotor length:.........350mm Essential accessories: 1) motor·ª 130 main motor 2) battery·ªli-polymer 7.4v, 1000mah 3) charger: 12v, 350ma 4) main rotor (carbon fiber) Model features: 1) it can simulate basic acts of lama such as hanging, advancing, retracting, yawing, etc. 2·¼it applies design of co-axial double-propeller and inverted rotating. The upper propeller produces lift and at the same time balances the airframe. And the lower propeller produces different speed differential and change the angel of the propeller while producing lift so as to realize the swerving and yawing of the helicopter. The unique design of co-axial inverted rotating of two propellers eliminates produced torsion and makes flying more stable and swift. 3) high quality pa and pp materials with good stiffness that enhances its anti-break capability 4) adopts emulation airframe design to furnish it with excellent external appearance. 1111111111111
