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Propeller design In the field of engineering, a propeller is a type of rotating aerodynamic device that is used to generate thrust by moving through a fluid, most commonly air or water. The term "propeller" typically refers to an aircraft propeller, although similar devices are also found on boats and other vehicles. A well-designed propeller can significantly enhance the performance of its parent vehicle by providing efficient propulsion. Key factors in designing an effective propeller include blade shape, size, and angle of attack, as well as materials used for construction. Innovations in propeller technology continue to drive advancements in aviation and maritime transportation.