1results about How to "Reduce induced drag" patented technology

This disclosure relates to a blade, propeller, powertrain, and unmanned aerial vehicle (UAV). The blade includes a root section and a main body section arranged radially in sequence. The pitch angle of the main body section decreases from a positive value to a negative value radially and away from the root section. The technical solution provided by this disclosure optimizes the angle of attack distribution at different radial positions of the blade by changing the pitch angle, balancing lift and drag. The pitch angle of the main body section near the root section is positive, providing high lift, while the pitch angle of the main body section away from the root section is negative, which can suppress tip turbine noise, reduce noise caused by airflow separation, and simultaneously reduce induced drag at the tip, improving overall efficiency.