A small experimental plane crashed behind a home in Ramona in rural San Diego County, seriously injuring the pilot, but no one on the ground was hurt, authorities said. Richard Quick, a pilot who shares a hangar with the injured man, identified the pilot of the small craft as Rob Lipner, an experienced pilot in his 50s. Lipner was flying alone in a single-seat, single-engine Moni, a light aircraft that is licensed as experimental and built from a kit, Quick said. Lipner was taken by rescue helicopter to Palomar Medical Center in nearby Escondido, where he was reported in serious condition. No injuries were reported on the ground and the crash caused no fire, Sheriff's Sgt. Ron Morse said. Quick said Lipner owned the plane for about a year and flew it frequently on weekends. Late last week, Quick said, Lipner told him the plane was "performing fantastically."