Question

Which existing technology did engineers use to enhance the speed of propeller-driven airplanes

Answer 1

Is there choices?

Answer 2

Engineers used superchargers to enhance the speed of propeller-driven airplanes. Superchargers increase the amount of air that is fed into the engine, allowing for a greater amount of fuel to be burned and increasing the power output of the engine. This technology was first developed in the early 20th century and was widely adopted during World War II to enhance the performance of military aircraft.