What does propeller efficiency measure in aircraft performance?

Propeller efficiency is a crucial aspect of aircraft performance, as it specifically measures how effectively a propeller converts the power generated by the engine into useful thrust. This efficiency is influenced by several factors, including the design of the propeller, its size, shape, and operating conditions. When a propeller can convert a higher percentage of engine power into thrust, it indicates that the aircraft can achieve better performance, such as increased speed or fuel efficiency. Understanding propeller efficiency is essential for optimizing flight operations and ensuring that the aircraft operates within its performance parameters.