https://en.wikipedia.org/wiki/Beriev_MBR-2

The Beriev MBR-2 was a Soviet multi-purpose (including reconnaissance) flying
boat which entered service with the Soviet Navy in 1935. Out of 1365 built, 9
were used by foreign countries including Finland and North Korea. In Soviet
Union it sometimes carried the nickname of "K?????" (cow).

Role
Patrol aircraft

Manufacturer
Beriev OKB

Designer
Georgy Mikhailovich Beriev

First flight
1931

Introduction
1935

Status
Out of production; retired

Primary user
Soviet Navy

Produced
1934-1941

Number built
1365

The MBR-2 was designed by Georgy Mikhailovich Beriev and first flew in 1931,
powered by an imported 373 kW (500 hp) BMW VI.Z engine. Production models, which
arrived in 1934, used a licence-built version of this engine, the Mikulin M-17
of 508 kW (680 hp), and could be fitted with a fixed wheel or ski undercarriage.

Beriev also designed a commercial airliner derivation, the MP-1, which entered
airline service in 1934, and a freighter version, which followed in 1936.

In 1935, an improved version was developed, the MBR-2bis, powered by the Mikulin
AM-34N engine, and fitted with an enclosed cockpit, dorsal gun-turret and
enlarged vertical tail. In this configuration, the machine remained in
production until 1941. As with the MBR-2, the bis spawned a commercial
derivative and the MP-1bis entered service in 1937.

Variants

MBR-2M-17 : Short-range maritime reconnaissance, bombing flying-boat, powered by
a 508 kW (680 hp) Mikulin M-17B piston engine.
MBR-2AM-34 or MBR-2bis : Improved version, powered by a Mikulin AM-34N engine.
MBR-2M-103 : One MBR-2AM-34 was fitted with the more powerful M-103 engine. One
prototype only.
MP-1 : Civil version of the MBR-2M-17 flying-boat. It could carry six passengers
in an enclosed cabin.
MP-1bis : Civil version of the MBR-2AM-34 flying-boat.
MP-1T : Freight transport conversion of MBR-2.

Specifications (MBR-2bis)

General characteristics
Crew: 4-5
Length: 13.50 m (44 ft 3½ in)
Wingspan: 19.00 m (62 ft 4 in)
Height: 4.40 m (14 ft 9 in)
Empty weight: 2,718 kg (5,990 lb)
Max. takeoff weight: 4,245 kg (9,359 lb)
Powerplant: 1 × Mikulin AM-34N V12 engine, 559 kW (750 hp)

Performance
Maximum speed: 275 km/h (148 knots, 171 mph)
Range: 1,500 km (810 nm, 930 mi)
Service ceiling: 4,900 m (16,080 ft)

Armament

Guns:
1× 7.62 mm (0.30 in) PV-1 machine gun in bow
1× 7.62 mm ShKAS machine gun in dorsal turret

Bombs: 300 kg (660 lb) of bombs, mines, and depth charges carried underwing




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