The Marchetti SV-20 compound helicopter project. I believe this to be from the same Charles Marchetti company that did the Heliscope project three posts above; however I don't know if this company is related in any way to Savoia-Marchetti and SIAI-Marchetti from Italy, since it seems to be a defunct Canadian company.
Yep...have you seen Baldwin's Site? Go there and click on "deep dive" . Alot of good GIFs of his protortype and actuall RC test beds............you may already have it, but I have trouble finding your rotorcraft list or I get re-routed to you site that you said you do not update.
Not quite sure if this belongs in the "little-known rotorcraft" section or the humor section... Anyway, here's a man-powered helo that... er... never took off!
I realize how much of a mistake it was making such a general topic. I encourage separate topics for projects that don't fit into normal manufacturers' categories.