The Beech Starship is the loudest private aircraft I've ever heard. One would fly over my house in Wichita, KS and I called it the flying lawnmower for its sickening howl. It was a composite dog, a first of sorts, but way too heavy and Beech bought them all back, except for one, and that owner vowed to never sell it back. For a long time the Starship (aka "Scarship") production line was all represented along the runway from whence they were birthed waiting to be scrapped.

Piaggio actually learned a lot from the Beech Starship mistakes, and it turned into a pretty successful private aircraft.