Don't underestimate progress in computer simulation. While reality is dirty and still unpredictable as a whole, the limit of predictability and computability of many more parameters should give a more precise estimation of what's feasible.
I guess CFM and partners did that.
Compare to the supersonic pax aircraft research in USA lately. Unthinkable 20 years ago to hope for a solution for sonic boom. Creativity, Simulation and Analysis also helped over there.
You think sonic boom can be solved, but not the open fan noise issues?
Last edited by waito; 29th Feb 2024 at 10:05.
Reason: typos