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......
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http://en.wikipedia.org/wiki/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 ... ...
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http://www.britannica.com/eb/a-z/p/121
a turbojet having a turbine-driven propeller that operates completely outside the jet engine. Cf.
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https://www.infoplease.com/dictionary/propfan
No exact match found.
