Thanks John. Your knowledge and recollection of Sikorsky is impressive. That is quite a list.
Out of curiosity I did a little research and found this on the first item #1.
"Officially listed as an HSS-2, the U.S. Navy's BuNo. 148033 was actually a Sikorsky S-61F compound research helicopter sponsored by the Army and Navy."
As to the last item, the original Cypher mentioned by IFMU was Sikorsky funded, where as with the later Cypher II
Sikorsky is currently [was]under a $5.46 million contract to deliver 2 prototypes and 4 ground stations
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Lastly, there was some discussion about the X2 being just a version of the XH-59. Possibly so, in the same sense that the Wright Flyer and the B-777 are both airplanes. The similarity ends there, however.
Interesting, but it misses the essence of the discussion. The discussion related to why the ABC concept was not pursued back then; and why it is [or was] being pursued now.
IMHO the esential question has always been; ~ Is the fundamental ABC concept viable, or is it not viable?
They stated very clearly back then
what the aerodynamic and dynamic improvements should be and they have now incorporated them, 30 years later. Today's new abilities, to fly-by-wire, fly-by-light, or fly by mental-telepathy represent an improvement for all aircraft. They are not unique to the ABC helicopter.
Dave