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Yes TinWing,
The Sikorski S-65 as 80-seat compound helicopter project.
Source:
http://www.flightglobal.com/pdfarchive/view/1967/1967%20-%200924.html
The Sikorski S-65 as 80-seat compound helicopter project.
Source:
http://www.flightglobal.com/pdfarchive/view/1967/1967%20-%200924.html