How an Open Fan Differs from Turboprop & How it Beats Turbofans

Support me on Patreon : https://www.patreon.com/letsgoaviate The Open Fan / Propfan / Unducted Fan engine is not new by any means, but in it's current form it's a serious contender to replace turbofan engines on airliners. But how does it work? If you've ever been frustrated at any explanations of the engine glossing over HOW it actually achieves it's superior efficiency, this video is for you! PROGRESS IN OPEN ROTOR RESEARCH: A U.S. PERSPECTIVE : ntrs.nasa.gov/api/citations/20150022391/downloads/20150022391.pdf The Difference between a Propeller and a Fan : youtu.be/9zRi-ti3y34 THUMBNAIL ATTRIBUTION (engine photo) CFM RISE Mockup Singapore Airshow-author Ecksar (creativecommons.org/licenses/by-sa/4.0/deed.en) cut background CFM International RISE au Salon du Bourget 2025-author Artvill (creativecommons.org/licenses/by/4.0/deed.en) cut background IMAGE ATTRIBUTION Safran Open Rotor-author Tiraden (creativecommons.org/licenses/by-sa/4.0/deed.en) FedEx ATR 72-600-author MarcelX42 (creativecommons.org/licenses/by-sa/4.0/deed.en) crop+zoom CFM International RISE au Salon du Bourget 2025-author Artvill (creativecommons.org/licenses/by/4.0/deed.en) cut background RR Trent-author Julian Herzog (julianherzog.com) (creativecommons.org/licenses/by/4.0/deed.en) cut background Moteur ATR 600-author Don-vip (creativecommons.org/licenses/by-sa/3.0/deed.en) cut out background McDonnell Douglas MD-81-author Andrew Thomas from Shrewsbury, UK (creativecommons.org/licenses/by-sa/2.0/deed.en) crop+zoom Turboprop operation-author Emoscopes (creativecommons.org/licenses/by-sa/3.0/deed.en) Cambrian Airways Vickers Viscount-author Ralf Manteufel (en.wikipedia.org/wiki/GNU_Free_Documentation_License) crop+zoom ATR 72-212A-author Fabrizio Berni (en.wikipedia.org/wiki/GNU_Free_Documentation_License) crop+zoom Turbofan operation-author K. Aainsqatsi (creativecommons.org/licenses/by-sa/4.0/deed.en) overlaid arrows F-104G des JG 71 „Richthofen“ 1973 in Wittmund-author Markus Kutscher, Frankfurt, Germany Boeing 737-200 engine-author Andre Gustavo Stumpf Filho from Brasil (creativecommons.org/licenses/by/2.0/deed.en) HBP Turbofan animation-author Richard Wheeler (Zephyris) (creativecommons.org/licenses/by-sa/3.0/deed.en) PW1100G-author Rafael Luiz Canossa (creativecommons.org/licenses/by-sa/2.0/deed.en) cropped Propulsive efficiency -author Pedro Alves,Miguel Silvestre, and Pedro Gamboa (creativecommons.org/licenses/by/4.0/deed.en) overlaid line CFM LEAP-author KGG1951 (creativecommons.org/licenses/by-sa/3.0/deed.en) BOEING 777-9-author Tomás Del Coro from Fabulous Las Vegas (creativecommons.org/licenses/by-sa/4.0/deed.en) crop+zoom PW123B turboprop-author Hunini (creativecommons.org/licenses/by-sa/4.0/deed.en) crop+zoom SAAF Mirage IIICZ-author Bob Adams from George, South Africa (creativecommons.org/licenses/by-sa/2.0/deed.en) overlaid text ATR 72 BRA-author Vogler (creativecommons.org/licenses/by-sa/4.0/deed.en) crop+zoom Europrop TP400-author jean-daniel pauget (creativecommons.org/licenses/by/2.0/deed.en) Pratt & Whitney Allison Triebwerk-author Cord Rodefeld (creativecommons.org/licenses/by-sa/2.0/deed.en) overlaid arrows DHC-6-300 Twin Otter-author Acroterion (creativecommons.org/licenses/by-sa/4.0/deed.en) crop+zoom Unducted Fan Engine-author Duch (creativecommons.org/licenses/by-sa/4.0/deed.en) ATR 72-600-author ATR Aircraft (creativecommons.org/licenses/by-sa/2.0/deed.en) crop+zoom CFM RISE Mockup Singapore Airshow-author Ecksar (creativecommons.org/licenses/by-sa/4.0/deed.en) Fan blades and inlet guide vanes of GEnx-2B-author Olivier Cleynen (creativecommons.org/licenses/by-sa/4.0/deed.en) crop+zoom Guido Pessotti CBA-123-atuhor Caio Marcos Franck Pessotto (creativecommons.org/licenses/by-sa/4.0/deed.en) crop+zoom+overlaid arrows McDonnell Douglas MD-81-author Andrew Thomas from Shrewsbury (creativecommons.org/licenses/by-sa/2.0/deed.en) Oil Prices Graph-author TomTheHand (creativecommons.org/licenses/by-sa/3.0/deed.en) crop+zoom Progress D-27-author Кореспондент АрміяInform (creativecommons.org/licenses/by/4.0/deed.en) Antonov An-70-author Oleg V. Belyakov (creativecommons.org/licenses/by-sa/3.0/deed.en) crop+zoom Spirit Airbus A320neo-author Acroterion (creativecommons.org/licenses/by-sa/4.0/deed.en) VIDEO ATTRIBUTION RISE Program : Discover the CFM Open Fan Architecture & Technologies by CFM International (youtu.be/w_CjQvlF-qM) copyright CFM International GE36 Unducted Fan by Matthew G. Saroff (youtu.be/L6Fe6O8w61Y) license CC-BY Focus sur le démonstrateur Open Fan CFM RISE exposé by Safran (youtu.be/51R2FGBGYfk) copyright Safran Antonov AN-70 takes off from Kyiv-Antonov airport by Antonov Company (youtu.be/PGaNyRU6T5o) license CC-BY Chapters: 0:00 Open Fan / Propfan / Unducted Fan 1:17 Turbojets, Turbofans and Turboprops 8:28 Blade Sweep 11:30 Method 1 : Anti-Swirl Vanes 13:29 Method 2 : Contra Rotating Propellers 15:28 Method 3 : Constant Speed Rotors 16:46 Open Fan Layouts 19:15 Open Fan Status & Challenges