Propfan - Wikipedia
Props” for McDonnell Douglas: The Unducted Fan Projects That Never Took Off
Jet engine - Turboprops, propfans, and unducted fan engines | Britannica
Variations of Jet Engines
Propfan - Wikipedia
General Electric unducted fan propulsor concept Modern technologies... | Download Scientific Diagram
Props” for McDonnell Douglas: The Unducted Fan Projects That Never Took Off
Why didn't the UDF (Unducted Fan/Propfan) catch on? - Quora
The UDF: A Great Idea That Suffered From Bad Timing And Image
Aerospaceweb.org | Ask Us - Propfan Engines
Propfan Engine with GB for 3D printer - YouTube
Popular Mechanics - Testing a GE36 Unducted Fan (UDF) engine, or propfan, on a Boeing 727 in the 1980s. | Facebook
Evolutionary Trail Of The Open-Fan Engine | Aviation Week Network
Commercial-Engine OEMs Detail Emissions Work | Air Transport News: Aviation International News
Could an open fan engine cut carbon emissions for more sustainable aviation? | Airbus
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
Cheap fuel killed propfan concepts decades ago. Can CFM's revived concept endure? | Analysis | Flight Global
Advanced turboprop (ATP) engines. Schematic images of a an unducted fan... | Download Scientific Diagram
File:UDF-cross-section.png - Wikimedia Commons
Evolutionary Trail Of The Open-Fan Engine | Aviation Week Network
Propfan Power: The Story of the Unducted Fan Engine – Airways
Safran Open Rotor – The Next Engine Design Leap? - Mentour Pilot
Boeing 727 UDF (Unducted Fan) engine. | FSX screenshot by Ga… | Flickr
