Experimental 4-seat light helicopter with egg-shaped fuselage, skid u/c, thin triangulated tail boom structure, powered by two AI-7 tip-mounted ramjets. One Prot. FF 1959.
R.Simpson "Airlife's Helicopter and Rotorcraft", 1998
Few details available of this experimental tip-drive helicopter completed 1959. Pilot and three passengers in stressed-skin nacelle with three doors, tail on tubular boom, skid landing gear and kerosene tank in roof. All-metal blades (related to final Mi-1 but shorter) carrying subsonic tip ramjets. Hub of design unlike other Mil helicopters. Inclined drive shaft to tail rotor. Believed never flew with more than pilot on board, and never publicized.
Bill Gunston "The Osprey's Encyclopedia of Russian Aircraft", 2000
Jim, e-mail, 22.09.2020 Rocketman
Just imagine the result of your idea - an ideal rotor without any friction at the root in order to avoid rotation of the body. Now how would you steer that thing ? If it already moved you could hope to use aerodynamic forces via some kind of rudder, but all that would be completely unstable, not to mention that there simply always is friction and even motion of the fluid from stationary tanks in the main body out to the wingtips would induce a moment and you would need rotor tilting mechanisms ... so in order to be able to point the nose in a stable direction you'd want to be able to use a tail rotor or equivalent - at least in such a basic design. I suppose that a Kamov-like co-axial twin-rotor with wingtip fans could be stabilized with modern fly-by-wire electronics, but in the 1950s ... no way.