4 ms·
https://en.wikipedia.org/wiki/General_Electric_GE36 https://en.wikipedia.org/wiki/General_Electric_GE36 - the Wikipeida article about GE's attempt to commerical
by sjm-lbm 5y ago
https://en.wikipedia.org/wiki/General_Electric_GE36 https://en.wikipedia.org/wiki/General_Electric_GE36 - the Wikipeida article about GE's attempt to commericalize something similar in the late 80s/early 90s seems to infer that there is some options that meet noise requirements while still providing meaningful efficency gains.
From the article:
"Chapter 4 community noise standards of the International Civil Aviation Organization's (ICAO's) Committee on Aviation Environmental Protection (CAEP), which would go into effect in 2006 and be a reduction of ten effective perceived noise decibels (EPNdB) from the existing Chapter 3 standards that were established in 1977. The regulatory compliance, however, caused a five-percent reduction in fuel efficiency compared to the most efficient fan configuration."