McDonnell HRH
The McDonnell HRH, company designation Model 78, was a 1950s transport helicopter proposal for the United States Marine Corps by the McDonnell Corporation, designed to operate from Commencement Bay-class escort carriers.Development
The HRH was developed in March 1951 in response to a USMC requirement for a 30 seat assault transport helicopter. The HRH's competitor was the Sikorsky HR2S. Three prototypes were ordered, and although the Bureau of Aeronautics expected the XHRH-1 to fly in December 1955, the design was cancelled in 1953 in favor in of the Mojave, the first prototype remaining un-completed.Specifications (Model 78 / XHRH-1 estimated)
