This was to be achieved by the use of more fuel-efficient engines, better aerodynamics and added fuel tanks.

Work began on the design in February 1948 and this was confirmed by a Council of Ministers order of 12 June that required the prototype be ready for State acceptance trials in July 1949.

The wings were enlarged to a total of 173 square metres (1,860 sq ft) and the rubber deicing boots were replaced by more efficient and aerodynamic bleed air deicers.

[3] Data from The Osprey Encyclopedia of Russian Aircraft 1975–1995 [4]General characteristics Performance Armament

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