Sikorsky Aircraft planned to have its turbine-powered S-62 utility helicopter in large-scale production in 1961. 

This article from 1958 shows images of the design of the helicopter from the front, side and above and explained that a fourth rotorblade could be added which would mean revising the gear arrangement. 

See also images of the cockpit and cabin which was designed to accommodate 10-12 passengers. 

One image shows the v-shaped bottom of the fuselage which would cushion impact when settling on water. 

If you're a subscriber, you can read the full article on page 74, in the Business Flying section of Aviation Week & Space Technology published in the issue dated Jun. 2, 1958. 

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