Curtiss-Sperry Flying Bomb

Hewitt-Sperry Automatic Airplane
Hewitt-Sperry Automatic Airplane in 1918
Role	Missile
National origin	United States
Designer	Elmer Sperry Peter Cooper Hewitt
First flight	September 1917
Status	Development discontinued
Primary user	United States Navy
Number built	7 Curtiss Model N-based prototypes 6 Curtiss-Sperry Flying Bomb prototypes
Developed from	Curtiss Model N

The Hewitt-Sperry Automatic Airplane was a project undertaken during World War I to develop an aerial torpedo, also called a flying bomb or pilotless aircraft, capable of carrying explosives to its target. It is considered by some to be a precursor of the cruise missile.

Before World War I, the possibility of using radio to control aircraft intrigued many inventors. One of these, Elmer Sperry, succeeded in arousing the US Navy's interest. Sperry had been perfecting gyroscopes for naval use since 1896 and established the Sperry Gyroscope Company in 1910. In 1911, airplanes had only been flying for eight years, and yet Sperry became intrigued with the concept of applying radio control to them. He realized that for radio control to be effective, automatic stabilization would be essential, so he decided to adapt his naval gyro-stabilizers (which he had developed for destroyers).

In 1913, the Navy provided a flying boat to test and evaluate the gyro-based autopilot. Sperry's son Lawrence served as an engineer during the test phase. In 1914, Lawrence Sperry was in Europe and observed the developing techniques of aerial warfare, including the use of aircraft. In 1916, the two Sperrys joined Peter Hewitt, an early inventor of radio-related devices, to develop an explosive-laden pilotless airplane.

Elmer Sperry and Hewitt served together on the Naval Consulting Board, where they both were members of the Committee on Aeronautics and Aeronautical Motors. Because of these connections, they were able to arrange for a representative of the Navy's Bureau of Ordnance, Lt. T. S. Wilkinson, to examine the control equipment they assembled. The system consisted of a gyroscopic stabilizer, a directive gyroscope, an aneroid barometer to regulate height, servo-motors for control of rudders and ailerons, and a device for distance gearing. These all could be installed in an airplane which could be catapulted or flown from the water, and would climb to a predetermined altitude, fly a pre-set course, and after traveling a pre-set distance, drop its bombs or dive to the ground. Wilkinson reported that the weapon did not possess a degree of accuracy sufficient to hit a ship, but, because of its range of 50 to 100 miles (160 km), it might be of interest to the Army.

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