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Manly and Samuel Langley.
The Great Aerodrome fails in its first test, October 7, 1903.

Charles Matthews Manly (1876–1927) was an American engineer.

Manly helped Smithsonian Institution Secretary Samuel Pierpont Langley build The Great Aerodrome, which was intended to be a manned, powered, winged flying machine. Manly made major contributions to the development of the aircraft's revolutionary 52 hp gasoline-fueled radial engine, called the Manly-Balzer engine. Manly attempted to pilot the Aerodome in its only two tests, October and December 1903. The machine failed to fly both times, plunging into the Potomac River after its launch from a houseboat. Manly was rescued unhurt, although he was briefly trapped underwater after the second test.

During World War I Manly was an advisor to the British War Office. He also earned about 40 patents in variable-speed hydraulic drives.

In 1919 he was president of the Society of Automotive Engineers (now SAE International). Following his tenure he did additional engineering research on engines. The Manly Memorial Medal is an annual award given by SAE for the best paper on aeronautical power plants.

He was a 1929 posthumous recipient of the Langley Gold Medal from the Smithsonian Institution.