The 1951 Sikorsky H-18 (S-52-2) was a variation of the Sikorsky S-52 H-18 HO5S from 1947, which was the first all-metal rotor blades helicopter in US. Two years later, in 1949, it was the first ever helicopter to loop and roll.
The 1951 version, was a prototype that had 4 seats and could carry approximately 800 pounds at a top speed of about 105 m.p.h. Later it was converted to a S-59 turbine powered.
 was a variation of the Sikorsky S-52 H-18 HO5S from 1947, which was the first all-metal rotor blades helicop...){kind=link}
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