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Propfan

A propfan is a type of aircraft engine related in concept to both the turboprop and turbofan, but distinct from both. The engine uses a gas turbine to drive an unshielded propeller like a turboprop, but the propeller itself is designed with a large number of short, highly twisted blades, similar to a turbofan`s bypass compressor (the `fan` itse......
Found on http://en.wikipedia.org/wiki/Propfan

propfan

(from the article `airplane`) Propfans, unducted fan jet engines, obtain ultrahigh bypass airflow using wide chord propellers driven by the jet engine. Rockets are purely reactive ... ...with swept-back leading edges at the blade tips to accommodate the large Mach numbers encountered by the propeller tip at high rotative and flight ... ...
Found on http://www.britannica.com/eb/a-z/p/121
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