Why do large aircraft used by the US Air Force, such as the C-130, use propellers over jet engines? Large aircraft utilized by the United States Air Force opt for propellers instead of jet engines due to their distinctive advantages. Propeller-driven airplanes exhibit optimal efficiency when operating at lower speeds, typically ranging from 250 to 400 Miles per hour, owing to their remarkable propeller efficiency. Compared to jets, propeller-driven aircraft demonstrate superior fuel efficiency, consuming less fuel per hour of operation. Turboprop engines, which combine a core engine with a propeller, resemble jet engines but extract minimal work from a substantial volume of air.

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