("Emily" wrote)
I work for a manufacturer of high-bypass turbofans and they're still
extremely loud. I also live next to one of the busiest airports in the
country. Believe me, there's not much difference between old and new.


Not sure if Honda's "GE-Honda" HF118 Turbofan Engine qualifies as
'high-bipass'
....it is extremely quiet.

On flybys at OSH, the HondaJet sounded like a handheld hairdryer, left
running across the room - on medium.

"The HF118 produces 1,700 lbf of thrust, and meets ICAO Stage IV noise
requirements. The sole application as of 2006 is for the HA-420 HondaJet."

http://en.wikipedia.org/wiki/Turbofan
Learning about high-bypass turbofans.... g


Montblack