in Pittsburgh, Pennsylvania. Stoker/passenger Louis Darvarich was said to have been injured when the plane crashed into an upper story of an apartment building. Whitehead later claimed to have flown a steam aircraft in Hartford, Connecticut, and to have been visited by one of the Wright brothers well before 1903. Mainstream aviation historians remain unconvinced of the Whitehead claims. The flights have never been verified satisfactorily; there are no photographs, news stories, or other media from 1899 to confirm them. Likewise, the supposed visit of the Wright brothers to Whitehead is apocryphal; other than affidavits taken over thirty years after the fact, there is no evidence the visit ever happened. 1902 Lyman Gilmore claimed in 1927 to have flown a steam-powered aircraft on 15 May 1902. The flight was unconfirmed. 1920: The Bristol Tramp was to have been a steam-powered aeroplane, but the turbine was over-powered, and the construction of a reliable boiler and condenser circuit was problematic. 1931 Harry Crossland Pfaff of Chicago designed and made a steam-powered aircraft. It was to be test flown by round-the-world aviator Clyde Pangborn. There is no record of the flight being made. 1933: George D. Besler and William J. Besler's prototype steam biplane, based on a Travel Air 2000, flew several times at Oakland airport. It was powered by a two-cylinder, double-expansion V-twin reciprocating engine weighing about , designed by the Doble Steam Motors Company and Besler. and was capable of STOL operation due to the ease of reversing the thrust. Several others were working on steam-powered flight at the time. Harold C. Johnson of Akron, Ohio, had made a steam engine for an aircraft in autumn 1932. The Great Lakes Aircraft Company of Cleveland, Ohio, was working on a steam-powered biplane. A Paris mechanic developed a light steam-powered engine for aircraft. Swedish steam turbine engineers were working on an aircraft engine, and G. A. Raffaelli, an Italian aeronautical engineer, published a paper in 1931 on a steam-powered engine for stratospheric flight . 1934: Newspapers of the time reported a steam-powered aircraft designed by a Mr Huettner, Chief Engineer of the Klingenberg Electric Works in Berlin, that used revolving boiler combined with a steam turbine. The plane was reported to have a design speed of and be capable of 60 to 70 hours non-stop flight. The Berlin reporter of the Czechoslovak Prager Tagblatt, who wrote the article, was arrested, and no more