Propfan - Wikipedia
Commercial-Engine OEMs Detail Emissions Work | Air Transport News: Aviation International News
Cheap fuel killed propfan concepts decades ago. Can CFM's revived concept endure? | Analysis | Flight Global
Cheap fuel killed propfan concepts decades ago. Can CFM's revived concept endure? | Analysis | Flight Global
Jett Mayhem on Twitter: "@MenTourPilot Take a look at the mid to late 80's GE36 unducted fan (propfan) - The tech and concept of this 25,000 lbf thrust GE engine design is
File:UDF-cross-section.png - Wikimedia Commons
Pratt & Whitney/Allison 578-DX - Wikipedia
Jet engine - Turboprops, propfans, and unducted fan engines | Britannica
Propfan Power: The Story of the Unducted Fan Engine – Airways
Advanced turboprop (ATP) engines. Schematic images of a an unducted fan... | Download Scientific Diagram
Pratt & Whitney-Allison Unducted Fan Engine | Download Scientific Diagram
Safran Open Rotor – The Next Engine Design Leap? - Mentour Pilot
Variations of Jet Engines
The UDF: A Great Idea That Suffered From Bad Timing And Image
Propfan Engine with GB for 3D printer - YouTube
Jet engine - Turboprops, propfans, and unducted fan engines | Britannica
Whatever happened to propfans? | News | Flight Global
Propfan - Wikipedia
Why didn't the UDF (Unducted Fan/Propfan) catch on? - Quora
The Short, Happy Life of the Prop-fan | Air & Space Magazine| Smithsonian Magazine
Boeing 727 UDF (Unducted Fan) engine. | FSX screenshot by Ga… | Flickr
Aerospaceweb.org | Ask Us - Propfan Engines
Could an open fan engine cut carbon emissions for more sustainable aviation? | Airbus
