The Bell (model 47) H-13 Sioux, with a crew of three, was one of the most popular light utility helicopters ever built. The Bell model 47 was produced continuously from 1946 to 1973. The U. S. Army Air Force procured it's first YR-13 (model 47B) in December 1946. The OH-13 had a cruising speed of 70 mph (60 knots).
Designation given to two production H-13H machines modified to commercial Model 47G-3 standard through the installation of 225 hp Franklin 6VS-0-335 engines, longer rotor blades, and other detail changes. These helicopters were optimized for high altitude operation and were evaluated at Fort Rucker, Alabama, in 1960 and 1961. Both were redesignated OH-13K in 1962.
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