Manly attempted to pilot the Aerodrome 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.

The Manly Memorial Medal is an annual award given by SAE for the best paper on aeronautical power plants.

He died at Kew Gardens, Brooklyn, NY on October 16, 1927, leaving two sons, Charles and John.

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