2 ms·
Yeah, don't these increase noise by a substantial amount?
by vidanay 5y ago
Yeah, don't these increase noise by a substantial amount?
- sjm-lbm 5y agohttps://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."
- ghostbrainalpha 5y agoThey actually have the potential to make less noise. "Some think that propfan engines can potentially cause less of a community impact than turbofan engines, because the rotational speeds of a propfan are lower than that of a turbofan. Geared propfans should have an advantage over ungeared propfans for the same reason."
- dkjaudyeqooe 5y agoFrom the article: "...has only a single fan blade and a variable geometry stator sitting behind it. This layout is expected to be more efficient and significantly quieter."