Curious if this has been discussed.
AWST Link; https://aviationweek.com/aerospace/cfm- ... gen-engine
CFM International joint venture partners GE Aviation and Safran have launched an aggressive technology development program to pave the way for a new generation of fuel-efficient unducted—or open fan—engines to enter service around the mid-2030s.
Also known as an open rotor engine, the open fan concept increases bypass ratio by eliminating the fan duct and offers double-digit efficiency gains due to a lower fan pressure ratio. The new engine will be developed as part of a suite of disruptive technologies under CFM’s newly unveiled Revolutionary Innovation for Sustainable Engines (RISE) program.
Targeting a 20% reduction in fuel consumption and CO2 emissions compared to current engines, RISE is aimed at the next generation of single-aisle airliners. The open fan program forms the foundation for a potential successor to CFM’s conventional direct-drive Leap-1 turbofan and offers the most realistic development opportunity yet for unducted fan technology since tests of the concept began in the 1980s.
From a regulatory perspective, this would be a challenge to certify I’d think as loss of a rotor would necessarily risk hitting the other engine (or passengers if on a wing).