The un-ducted engine could be revived to help the aviation industry fight climate change.
Using non-ducted fans allowed Safran to develop an engine with a larger fan surface area, making it more fuel-efficient.
Since that time, CFM has further developed the concept. The latest iteration of the open rotor engine has a single fan blade and a variable geometry stator placed behind the fan, making the new concept much quieter — Sarfran's prototype noise levels were compared to that of a turbofan.
Propfans were first experimented with as a potential response to the oil crisis in the 1970s, due to their ability to boost fuel efficiency. Though they never gained traction in mass-scale commercial flight, new aviation climate change regulations mean that such a design may one day be adopted at a wider scale.
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