SPERRY
Avionics mfr
SPH
Single Pilot Helicopter
SPHERICAL ERROR PROBABILITY(SEP)
A probability that a percentage of three-dimension measurements will lie within a sphere of given radius, with the sphere centered at truth or mean of...
Hewitt-Sperry Automatic Airplane, weapon (1916)
Kettering Bug, weapon (1918)
OQ-2/TDD-1 Radioplane, target (1939)
Ryan A/BQM-34 series Firebee I and II, target (1951)
North American X-10, research (1953) ...
In 1929, Lawrence Sperry and his Gyroscope Company introduced important new technology-the Artificial Horizon-that operated on gyroscopic principles.
Before the invention of mechanical control devices such as the British robot pilot known colloquially as "George" and the American Sperry automatic control ("Iron Mike"), inherent stability in aircraft was a most important quality.
A handful of N-9s were used in the Hewitt-Sperry Automatic Airplane project to develop an "aerial torpedo", an unmanned seaplane that would hit a distant target.On March 27, 1919, the first transatlantic flight was completed by a U.S.
 See also: Navigation, Pilot, Speed, RAF, Airspeed
  
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