RC helicopters with 4-blade rotor

rotor diagram: coaxial, blades 4 pcs, flight: 7 min, up to 10 m, control channels 3, 220x38x98 mm

rotor diagram: coaxial, blades 4 pcs, flight: 6 min, up to 30 m, control channels 3, 362x57x155 mm

rotor diagram: coaxial, blades 4 pcs, flight: 8 min, up to 10 m, 185x35x85 mm

rotor diagram: coaxial, blades 4 pcs, diameter 190 mm, flight: 8 min, up to 10 m, a gun, 230x47x117 mm, 47 g