He started
gliding after World War II and was a three-time winner (1948, 1949, 1953) of the
Richard C. du Pont Memorial Trophy, awarded annually to the U.S. National Open Class Soaring Champion. In 1956, he became the first American pilot to become the World Soaring Champion in the World Championships at St Yan in France. He invented a device that told pilots the best
speed to fly a glider, based on the predicted rate of climb in the next thermal and the glider's rate of sink at different air-speeds.
Sailplane pilots still use the "
MacCready speed ring", on their rate-of-climb instrument to optimize their flying speed between areas of "lift". In the 1970s, he guaranteed a business loan for a friend, which subsequently failed, leaving him with a $100,000 debt. This was the motivation he needed to compete for the £50,000
Kremer prize for human-powered flight, which had been on offer for 18 years. With Dr. Peter B.S. Lissaman, he created a
human-powered aircraft, the
Gossamer Condor. The Condor stayed aloft for seven minutes while it completed the required figure eight course, thereby winning the first Kremer prize in August 1977. The award-winning plane was constructed of aluminium tubing, plastic foam, piano wire, bicycle parts, and
mylar foil for covering. Kremer then offered another £100,000 for the first human-powered crossing of the English Channel. MacCready took up the challenge and in 1979, he built the Condor's successor, the
Gossamer Albatross, and won the second Kremer prize, flown by Bryan Allen (a pilot and athlete who could pedal better than most pilots) from England to France. He also received the Collier Trophy, which is awarded annually for the greatest achievement in aeronautics or astronautics, for his design and construction of the Albatross. MacCready also collaborated with
General Motors on the design of the
Sunraycer, a solar-powered car, and then on the
EV1 electric car. In 1985, he was commissioned to build a halfscale working replica of the
pterosaur Quetzalcoatlus for the
Smithsonian Institution, following a workshop in 1984, which concluded that such a replica was feasible. The completed remote-controlled flying reptile, with a wingspan of 18 feet, was filmed over Death Valley, California in 1986 for the Smithsonian's
IMAX film
On the Wing. It flew successfully several times before being severely damaged in a crash at an airshow at Andrews AFB in Maryland. MacCready helped to sponsor the Nissan Dempsey/MacCready Prize which has helped to motivate developments in racing-bicycle technology, applying aerodynamics and new materials to allow for faster human-powered vehicles. He was the founder (in 1971) and Chairman of
AeroVironment Inc., a public company (AVAV) that develops unmanned surveillance aircraft and advanced power systems. AV flew a prototype of the first airplane to be powered by hydrogen fuel cells, the Global Observer. MacCready died on August 28, 2007, from metastatic melanoma. He was an atheist and a skeptic. He was survived by his wife Judy, his three sons
Parker, Tyler and Marshall and two grandchildren. ==Awards and honors==