The Chyetverikov MDR-6 was a 1930s Soviet Union reconnaissance flying-boat aircraft, and the only successful aircraft designed by the design bureau led by Igor Chyetverikov.

First flying in July 1937, the MDR-6 was a two-engined high-wing monoplane of all-metal stressed skin construction.

All the aircraft were withdrawn from service in 1942 due to structural problems.

[1] Several progressively advanced prototypes were built from 1939 to 1945, but no further production ensued.

Data from Donald, 1997, pg 258.General characteristics Performance Armament