The First Man-Carrying Aeroplane Capable of Sustained Free Flight: Langley's Success as a Pioneer in Aviation / From the Smithsonian Report for 1914, pages 217-222, Publication 2329, 1915

The report traces early efforts to achieve sustained manned flight, recounting systematic model experiments and the building of a full-size tandem monoplane, the launch accident that halted trials, and the resulting public skepticism and suspension of work. It then describes later investigators who examined, repaired, and adapted the original machine for renewed trials, fitting hydroaeroplane floats and a more recent engine, testing several launching methods, and achieving powered flights. Technical discussion summarizes control arrangements and stability—reliance on wing dihedral and rudder placement—evaluates the tandem layout, and considers whether the craft should be preserved for display or used for further scientific study.