In 1849, Cayley built his first full-sized glider based on the same designs he created back in 1799, and successfully flew a 10 year old boy on one short flight. In 1853, he built a larger glider and sent his coachman flying 900 feet across a Brompton dale. Some say it was his grandson and not the coachman who took flight. Still others insist it was neither, but the butler instead.