Core Viewpoint - CFM, a French-US jet engine maker, is exploring both an advanced ducted engine design and an open-fan concept for future jets, focusing on fuel savings and lower emissions [1][2]. Group 1: Engine Design Options - CFM is advocating for an open-rotor engine design, which features a large exposed fan, claiming it can achieve fuel and emissions savings of 20% as part of the RISE research program [2]. - In addition to the open-fan design, CFM is also examining a more conventional "advanced ducted" engine design, which would have a fan contained within a shell similar to current engines, although this design is expected to save less fuel [3][4]. Group 2: Implications for the Industry - The choice between these engine technologies could significantly impact the efficiency of aircraft expected to enter service around 2040, as well as the commercial strategies of major manufacturers like Airbus and Boeing [3]. - The emergence of the "Advanced Ducted-Large" (ADL) project indicates that CFM is taking the alternative engine design seriously enough to warrant dedicated attention [4][5]. Group 3: Company Position and Future Plans - CFM, co-owned by GE Aerospace and Safran, has stated that it is prepared to provide any engine designs that aircraft manufacturers require, and has not ruled out conventional designs despite promoting the open-bladed architecture [5]. - The project to study the advanced ducted architecture is part of a broader initiative targeting a cluster of technologies ahead of any specific engine design [4].