![cover image](https://wikiwandv2-19431.kxcdn.com/_next/image?url=https://upload.wikimedia.org/wikipedia/commons/thumb/0/0a/Maquette_UDF_-_Mus%25C3%25A9e_Safran_%2528cropped%2529.jpg/640px-Maquette_UDF_-_Mus%25C3%25A9e_Safran_%2528cropped%2529.jpg&w=640&q=50)
Propfan
Type of aircraft engine / From Wikipedia, the free encyclopedia
Dear Wikiwand AI, let's keep it short by simply answering these key questions:
Can you list the top facts and stats about Propfan?
Summarize this article for a 10 year old
SHOW ALL QUESTIONS
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".
![](http://upload.wikimedia.org/wikipedia/commons/thumb/0/0a/Maquette_UDF_-_Mus%C3%A9e_Safran_%28cropped%29.jpg/640px-Maquette_UDF_-_Mus%C3%A9e_Safran_%28cropped%29.jpg)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/7/73/578-DX_%28on_testbed%29.png/640px-578-DX_%28on_testbed%29.png)