Sikorsky | ||||||||||||
HO5S #
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HO5S-1 Photo: Robert Deering 4/18/2015 National Museum of Naval Aviation NAS Pensacola (NPA) Pensacola, Florida |
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Derived from the 1940s-era Sikorsky S-52,
the HO5S was the first helicopter with
all-metal rotor blades. Originally a
two-seat design, the helicopter incorporated
four seats in its military configuration and
saw use primarily with the Marine Corps
during the Korean War as an observation
aircraft or for day and night evacuation of
personnel.
In a 1951 TIME magazine article titled "The
Triumph of the Egg Beater," the
correspondent pointed to the Sikorsky YH-18
as an example of the advancement in
helicopter design and production. The YH-18
was the Army version of the Sikorsky S-52
(designated HO5S by the Navy), of which 87
were procured for use by the Navy, Marine
Corps and Coast Guard. Despite the fact that in the hands of a Sikorsky test pilot the S-52 had established a world helicopter speed record of 129.5 mph, once in service military pilots found the type's speed deficient when it came to the missions it was tasked to perform, its small cabin size and relatively limited range also working against it. Thus, the HO5S never achieved widespread use, instead being gradually phased out in favor of the more advanced designs that followed it. In an interesting side note, however, the design provided a basis for conversion to turbine power, with Sikorsky modifying two of the Army's YH-18s to XH-39s that incorporated four rotor blades and retractable tricycle landing gear as well as turbine power. The XH-39 was ultimately rejected, however, in favor of Bell Helicopter's famed "Huey." |
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