The next generation of the Corvalis single-engine piston airplane will be introduced later this month at Sun 'n Fun in Lakeland, Fla., Cessna said on Tuesday. The turbocharged Corvalis TT currently in production was originally developed by Lancair as the Columbia 400, and taken over by Cessna a few years ago. It can fly at speeds up to 235 knots, which makes it the world's fastest fixed-gear single-engine piston aircraft. Cessna sold 110 copies of the Corvalis TT in 2008, which fell to 41 in 2009 and just 7 last year, as the general aviation market slowed overall. Details about the new version of the airplane will be announced on March 29, Cessna said, and a mock-up will be on display.