Grigorovich MR-5

The Grigorovich MR-5 was a long-range reconnaissance flying boat designed by the Grigorovich Design Bureau for the Soviet Navy in the late 1920s.

Design
The MR-5 was similar to the MR-2 in layout, armament, and payload, but had a more powerful BMV VI engine and an all-metal hull. Flight tests were conducted in Taganrog beginning in July 1929, and although the aircraft behaved well in the air, takeoff was sluggish.