8520(8.5×20) Blade Propellers are high-quality propellers designed explicitly for multi-copters. These Props are lightweight and high strength providing an angle of 15° design at the end of the propeller. This 15degree avoids whirlpool multi-copter flying. These propellers widely used for lower RPM motor and slow-flying drone models. 8520 propeller designed with length in 8.5 inches and the pitch 20 inches per revolution. The wide and thin blades of the propeller in their size category make them highly flexible in crash conditions. Thus they do not break easily. 8520(8.5×20) blade Propellers Black especially draws the larger amount of currents and as a result, gives us a considerable amount of thrust.
The propeller 8520 consists of a set of counter-rotating RC aircraft propellers. It is perfect for use in twin and multiple motor RC airplanes or coaxial RC helicopters. 8520 pack consists of 2 propellers with adapters (2 CW and 2 CCW). Two of the propellers rotate clockwise CW and the other two rotates counter-clockwise CCW. It is quite difficult to find matched rotor blades to matched counter-rotating pairs. These adapters allow the propeller to be used with motors of different shaft diameters.
Moreover, the 8520 propellers works perfectly with Coreless motor 7*16mm, 7*20mm, 8.5*20mm with 1m shaft diameter. The propeller offers smooth flights with longer flight times perfect for FPV and aerial photography while using a low kV motor. Whereas with a high kV motor (more than 1200 kV) this propeller offers fast flights perfect for acrobatic flights. These Propellers provides high endurance and flexibility for great impact. Thereby helps to improve the air-powered efficiency and aerofoil stability.