Propfan

A propfan, also called an open rotor engine, open fan engine^[1]^[2] or unducted fan (as opposed to a ducted fan), is a type of aircraft engine related in concept to both the turboprop and turbofan, but distinct from both. The design is intended to offer the speed and performance of a turbofan, with the fuel economy of a turboprop. A propfan is typically designed with a large number of short, highly twisted blades, similar to the (ducted) fan in a turbofan engine. For this reason, the propfan has been variously described as an "unducted fan" (UDF) or an "ultra-high-bypass (UHB) turbofan".

^ "Safran tests radical jet engine design in historic wind tunnel". Reuters. January 20, 2024.
^ "Evolutionary Trail of the Open-Fan Engine | Aviation Week Network".

[1] "Safran tests radical jet engine design in historic wind tunnel". Reuters. January 20, 2024.

[2] "Evolutionary Trail of the Open-Fan Engine | Aviation Week Network".

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