So with renewed interest on aircraft emissions (due to Greta Thunberg et al.), I thought of drawing attention to this promising concept from the 80s. It's still

So with renewed interest on aircraft emissions (due to Greta Thunberg et al.), I thought of drawing attention to this promising concept from the 80s. It's still being worked on by Safran: https://www.avweb.com/recent-updates/business-military/safran-starts-open-rotor-ground-testing/ https://www.avweb.com/recent-updates/business-military/safra... with apparently the noise problems addressed. The basic idea is it generates similar amounts of thrust as a turbofan while consuming 35% less fuel. It was a great idea, but fuel prices were low and aeroacoustics wasn't at a state to handle geometry this complex. I wouldn't be surprised to see us flying on these in 50 years though.