luedo34 said:
Thanks a lot Readstar72, very interesting!

Im am very interested in this kind of aircraft. Did the USSR have any post war tilt-rotor projects ? I only know of the Mi-30 and the M-12.
Yes, we had – and not only postwar. The first was wartime, while it was only a student’s project. In 1944, 20-years-old Shota Hutsishvili, a Georgian native and a student of Tbilisi aviation college, designed it as his graduation work. He proposed a single-seat VTOL tilt-wing fighter with two radial engines and props/rotors of 5 m diameter. He called it “Gelikopter-samolet”, or “helicopter-airplane”. The project didn’t develop further, but its author became a MAI student without any exams.
In 1947, Hutsishvili proposed another “helicopter-airplane” project. It was tiltrotor with engine nacelles mounted on wingtips; the props became larger (9 m diameter) and looked more alike helicopter rotors. Its supposed takeoff weight was 2200 kg, and maximum speed about 360 km/h with 2500-hp powerplant. This project was considered by the Expert Council of MAP SSSR (USSR Ministry of aircraft production), but was rejected because of underdeveloped rotors and flight control systems.
http://vtol.boom.ru/rus/Shota/index.html
The next was Ivan Bratukhin, known as a helicopter designer. In 1955-56, working at CAGI, he proposed a tilt-wing VTOL transport aircraft with two mighty NK-12MV turboprops. He calculated it could transport 5 ton load to 1250 km with 700 km/h cruise speed. The takeoff weight was about 30 tons.
http://vtol.boom.ru/rus/Bratuhin/index.html
A similar project was designed by SKB MAI in 1963, but it had four turboprops:
http://vtol.boom.ru/rus/mai/index.html
Also, Beriev OKB worked in 1960s on the design of VTOL transport aircraft. It was Be-32 program (not to confuse with modern little turboprop airliner!) There were many different projects of Be-32 designed, just like its Myasischev competitor M-12. Most of them were jets with additional lift engines. But it was also a quad-tiltrotor version, similar to Curtiss X-19, but much larger:
http://vtol.boom.ru/rus/Be-32652/index.html