The propellers 9×4.7 is the high-quality propellers specially designed for multi-copters. These propellers are light in weight and high strength propeller has a 15° angle design at the end of the propeller to avoid whirlpool while the multi-copter is flying. They are useful in drones as well as in multi-copters. The propellers is of high endurance and flexibility for great impact. The propellers help to improve the air-powered efficiency and aerofoil stability.