HJS [ S-53 ]
A development of the S-51, under the Naval designation HJS, the S-53 did not enter production after two prototypes were fabricated. This four-seat military helicopter was similar to S-51 with tricycle u/c, small tail rotor pylon, tailplane and powered by one 525hp Continental R-975-34 engine.
The S-53 was built in 1948 for the participation in the competition to the new helicopter for the fleet. Similar to S -51, it was equipped with a folding three-bladed rotor and the bottom flap of cab, intended for fastening of winch. Its competition proved to be the helicopter of the tandem diagram Piasecki XHJP-1, the predecessor of family HUP. Its superiority proved to be so suppressing that the official biographers Sikorsky and to this day only casually mention about S-53, and they now and then shyly hush up about it entirely. Only three prototypes were ever built.
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