Jonathon W. Tipton, 19, of Clyde, was taken by medical helicopter to Mercy St. Vincent Medical Center after a single-vehicle crash in Sandusky County Thursday night. He was driving a 1997 Pontiac Grand Prix and failed to negotiate a curve, according to a release from State Highway Patrol. A passenger, Attiah M. Fogle, 19, of North Canton, also was flown by helicopter to the hospital. Another passenger, Dustin J E Waugh, 19, of Chillicothe, was taken to Fremont Memorial Hospital. The crash was under investigation this morning.