Civil S-65
SAS,
Actually there were two different projects, and not directly connected.
There was an S-65 Commercial Compound project, with a large group of design engineers assigned, down at the original a South Avenue ( Bridgeport ) plant. Rather large wings with a T-64/prop on each, cross-shafted to the main box and tail rotor. Likely that was the one Jock Cameron was involved with.
Later on, there was a much smaller effort, whose goal was simply to delineate the scope of work required to take the 53D and certify it. The laundry list was longer than one might think. There was no serious cabin stretch in this look, just the sort of stuff Nick did did in building the VH-92 demo aircraft. ( an aside there: that machine had the additional three force generators and the N/rev ride was excellent. An option that if made standard, would certainly have changed the general impression of the ride quality )
Neither concept generated anywhere close to a break even point in potential sales, or so was the word.
Thanks,
John