First flight was on Novemless than a year from the program start date. Air Force who ordered five YH-19 helicopters for service evaluation. Katzenberger provided the creative spark that made it all come together successfully. Of the many helicopter designers who helped develop this new configuration, Edward F. This configuration, as embodied first in the S-55, led to Sikorsky capturing a major share of the worldwide utility market and it further led to foreign competitors copying this configuration. Both of these novel features were major departures from Sikorsky’s earlier configuration as embodied in the R-4, R-5 and R-6 models and were responsible for the development of a highly successful design well suited to larger utility helicopter models. The result was achievement of nearly unrestricted placement of passengers or cargo in a relatively spacious cabin. Engine placement below and forward of the cockpit resulted in a large cabin directly below the main rotor and the rotor’s offset hinges provided large control moments to enable a wide center-of-gravity range. Its most significant novel features included unique placement of its piston engine and the incorporation of offset hinges in its main rotor head. Sikorsky designed and fabricated a mockup of an entirely new model with many novel features in less than one year.
The Sikorsky S-55 helicopter was a utility helicopter developed with company funds and without government sponsorship.
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