Propfan - Wikipedia
Unducted Fan Airliner Concept – Aerospace Projects Review Blog
The Ultra High Bypass Engine
Ultra High Bypass Jet Engine Propfan Technology | Aviation Videos | AeroSpaceNews.com - YouTube
The Short, Happy Life of the Prop-fan | Air & Space Magazine| Smithsonian Magazine
Evolutionary Trail Of The Open-Fan Engine | Aviation Week Network
UDF, Unducted Turbofan, GE-Aircraft Engines, Unducted Fan, MD-U-B Demo Images, Photography, Stock Pictures, Archives, Fine Art Prints
General Electric unducted fan engine prototype — Calisphere
Commercial-Engine OEMs Detail Emissions Work | Air Transport News: Aviation International News
The Dreams And Reality Of A Future Airliner | WIRED
File:UDF-cross-section.png - Wikimedia Commons
Why didn't the UDF (Unducted Fan/Propfan) catch on? - Quora
TIL there's something called an Unducted Fan Engine : r/aviation
Cheap fuel killed propfan concepts decades ago. Can CFM's revived concept endure? | Analysis | Flight Global
Evolutionary Trail Of The Open-Fan Engine | Aviation Week Network
Propfan - Wikipedia
GE36 Unducted Fan - YouTube
Popular Mechanics - Testing a GE36 Unducted Fan (UDF) engine, or propfan, on a Boeing 727 in the 1980s. | Facebook
Pratt & Whitney-Allison Unducted Fan Engine | Download Scientific Diagram
Props” for McDonnell Douglas: The Unducted Fan Projects That Never Took Off
General Electric unducted fan propulsor concept Modern technologies... | Download Scientific Diagram
jet engine - Turboprops, propfans, and unducted fan engines | Britannica
The UDF: A Great Idea That Suffered From Bad Timing And Image
Variations of Jet Engines
Props” for McDonnell Douglas: The Unducted Fan Projects That Never Took Off
