Sikorsky Aircraft and soon increased prize money to US$25,000. In 2010, Sikorsky Aircraft pledged to increase the prize sponsorship to US$250,000. The Canadian engineers Dr. Todd Reichert and Cameron Robertson developed the world's largest ever human powered helicopter with a team from the [[University of Toronto]]. The first flight of AeroVelo Atlas was achieved in August 2012, the 64-second, 3.3-m-flight that won the prize on June 13, 2013. Sikorsky designates nearly all of its models with S-numbers; numbers S-1 through S-27 were designed by [[Igor Sikorsky]] in the Russian Empire. Later models, especially helicopters, received multiple designations by the military services using
Sikorsky S-38 the Sikorsky Manufacturing Corporation of Long Island, New York, and by the Sikorsky Aviation Corporation in Bridgeport, Connecticut. Sikorsky was acquired by United Aircraft and Transport Corporation in mid-production. Some famous owners include: During the 1990s two reproduction S-38s were built by the late Buzz Kaplan’s “Born Again Restorations,” of Owatonna, Minnesota. One was produced for Samuel Curtis Johnson Jr., the son of Herbert Fisk Johnson, to recreate his fathers flight, which he completed in 1998. the plane is suspended from the ceiling of Fortaleza Hall in the S. C. Johnson & Son company headquarters in Racine, Wisconsin . The