Mil Mi-32
The Mil Mi-32 was a project for an extremely heavy crane helicopter from 1982. As an absolute specialty, it had three main rotor systems based on the Mil Mi-26 . These three systems were connected by a fuselage that connected the systems in a triangle. The middle between the three main rotors remained free. The take-off weight of the device intended for material transport in Siberia should be 142 tons, the maximum speed 230 km / h and the range 600 km. Due to the dissolution of the USSR, however, it was not carried out.