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was an experimental compound co-axial helicopter developed as part of the Advancing Blade Concept (ABC) program in the 1970ies.
Media in category "Sikorsky S-69"
The following 3 files are in this category, out of 3 total.
XH-59A helicopter in 1981 (1).JPEG
XH-59A helicopter in 1981 (2).JPEG
XH-59A helicopter in 1981 (3).JPEG
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