The expression "cone of silence" took on new meaning when British manufacturer Ultra Electronics developed its electronic noise-canceling system for the noisy cabins of turboprop regional airliners. Now Elliott Aviation in Moline, Ill., has improved on the original product to create its Sound Management System (SMS) for the Beech King Air 200, 300 and 350 executive turboprops. "In a turboprop-powered aircraft, most of the noise is created by propeller blades projecting a shockwave ...
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