propfan
Quick Summary
A propfan is a type of aircraft engine that uses a large, wide-bladed propeller driven by a jet engine. This design aims to achieve high propulsive efficiency by moving a large volume of air at a slower speed compared to traditional jet engines. Propfans are an evolution of turboprop technology, designed for efficient operation at higher flight speeds, approaching the speed of sound. They often feature multiple, swept-back blades to handle these higher speeds and can be configured as unducted fans, meaning the propeller is not enclosed within a nacelle. This design contributes to improved fuel efficiency and reduced noise levels.12
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