aircraft noise

From: (Simon S. Donnelly)
Organization: University of Illinois at Urbana
Date:         04 Feb 93 02:36:34 PST
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Hi. I'm an amateur enthusiast, not in-the-know about aircraft. A naively 
ignorant question for those who know: why is it that small-ish 727s and 737s
seem to make so much noise on take off and even fly-by, compared to the 
apparently MUCH quieter 747s? This has been my distinct impression on 
numerous occasions. Is is just more efficiently designed engines, or better
noise insulation, or what? 

Grateful for any replies. Summary posted if necessary.

Simon D.

Dept of Linguistics, U. of Illinois, USA
(217) 384 1989