MBR-7 flying boat-monoplane with M-103 engine, 850 hp and a three-bladed pusher propeller of variable pitch VISH-2PT (right, pushing). The design of the aircraft, like that of the MBR-2, was all-wood, however, unlike the angular "barn", the new boat had a clean aerodynamic shape. The wing of the aircraft is of the "gull" type, two-spar, coffered type of mixed design.

The defensive armament consisted of two firing points with ShKAS machine guns, bombs with a total weight of up to 400 kg were suspended from underwing bomb racks. The crew consisted of two people - a pilot and a navigator. The aircraft was equipped with a modern PNO, an AFA-27 camera and an RSRM radio station.

Flight tests of the first MBR-7 began on April 9 and problems immediately began when the MBR-7 landed, throwing itself out of the water by 2-3 meters. The debugging of the aircraft dragged on until late autumn and ended on October 16, 1939. The problems were solved by a set of measures taken.

But the streak of failures continued. To continue testing the MBR-7, it was decided to overtake it to Sevastopol. The flight was scheduled for October 26th. But, the plane never made it to Sevastopol. On the day of departure the weather was fresh and on takeoff the car began to "leopard" and at the next jump flew high and, not picking up the required speed, turned over, fell into the water. The crew was not injured, while the boat could not be restored.

The shortcomings and defects revealed during the tests were decided to be fully eliminated on the second copy of the MBR-7, the construction of which was completed in the spring of 1940. The backup differed from the first prototype, shifted to the nose by 0.2 m, in order to obtain a more forward alignment , nacelle. To reduce the weight of the aircraft, the wing was made one-piece. In addition, the area of ​​Schrenck's flaps, vertical and horizontal empennage, including rudders and elevators, was increased.

May 31 MBR-7 - understudy made its first flight. This time, there were no particular problems and the tests were completed on June 24 after completing 26 flights.

However, by this time, MBR-7 was no longer interested in the customer. It was decided that in the future, two types of seaplanes were to be in service with the Soviet naval aviation: a long-range reconnaissance aircraft and a shipborne reconnaissance aircraft, which could simultaneously perform tasks of close naval reconnaissance. The creation of such a seaplane - KOR-2, had already been engaged, therefore all work on the development of the MBR-7 was stopped.

Photo	Description
	Drawing MBR-7
	MBR-7

Bibliography

• The history of aircraft designs in the USSR, before 1938 / V.B. Shavrov /
• Aircraft TANTK them. G.M. Berieva / A.N. Zablotsky, A.I. Salnikov /
• 75 years of TANTK them. G.M. Berieva / A.N. Zablotsky, A.I. Salnikov /