This Day in Aviation History

February 12th, 1947
First flight of the Sikorsky S-52.

The Sikorsky S-52 was a utility helicopter developed by Sikorsky Aircraft in the late 1940s. It was used by the U.S. Navy, Marines, and Coast Guard. The S-52 was the first US helicopter with all-metal rotor blades. A two-seater, it was developed into the four-seat S-52-2. It was designated HO5S-1 by the U.S. Navy and Marine Corp; HO5S-1G by the Coast Guard; and YH-18A by the Army….

Source:
Wikipedia, Sikorsky S-52:  http://en.wikipedia.org/wiki/Sikorsky_S-52

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