Belyayev DB-LK

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Belyayev DB-LK
Belyayev DB-LK.JPG
Type: Bomb plane
Design country:

Soviet Union 1923Soviet Union Soviet Union

Manufacturer:

OKB -16

First flight:

1939

Commissioning:

-

Number of pieces:

1

The Belyayev DB-LK ( Russian Беляев ДБ-ЛК ) was a twin-engine Doppelrumpf- bomber with negatively swept wing, which by its design produces both similarities to a flying wing (there but had a conventional horizontal stabilizer ) and with the buoyant hull concept of Burnelli had. It was a typical example of the Soviet aircraft manufacturer's search for unconventional solutions to aerodynamic problems in the 1930s. Only one copy was made of the DB-LK.

development

ZAGI BP-2
ZAGI BP-3
Belyayev DB-LK
Soviet postage stamp with the BP-2

As early as 1933, the designer Viktor Beljajew had designed a strongly tapered wing with a negative sweep. The taper was 7: 1, the leading edge sweep −6 °. The marginal arches were strongly drawn back. Beljajew successfully tested the structure on the gliders BP-2 (ZAGI-2, 1934) and BP-3 (1936). The latter was built in a small series and used for pilot training in the Jeisk naval aviation school . The BP-3 had a central wing with a strong V-shape and the level pendulum elevator was under the wing between the side fins.

In 1935, the AWIAWNITO company announced a competition for a fast passenger aircraft . Beljajew participated with his team and designed a flying wing aircraft called ZAGI-3 with a double fuselage. In 1938 the demand was made to convert the ZAGI-3 into a fast long-range bomber. After the intercession of Sergei Ilyushin , the OKB -16 was founded and Belyayev was appointed its chief designer.

The project was changed in some points: the aircraft received automatic slats and the NACA 23012 profile , which was already used in the SB-2 bomber . For the first time in Soviet aircraft construction, countersunk rivets were used for the fuselage construction. The elevator was fixed slats on the leading edge to one with larger swings stall to prevent. Two M-87Bs served as propulsion systems, with the main landing gear shafts and the crew cabins in their gondolas. The name of the aircraft was DB-LK (Dalni Bombardirowschtschik-Letajuschtschije Kryljo = long-range bomber-flying wing).

After delays caused by skepticism about the unconventional interpretation and internal party skirmishes, the DB-LK successfully completed its first flight in 1939 with test pilot M. A. Nyuchtikow on the airfield of the Research Institute of the Air Force in Chkalovskaya. The tests showed good-natured flight characteristics and very good performance parameters. Despite the weak M-87 engines, the aircraft reached a top speed of 488 km / h at an altitude of 5100 meters. On May 1, 1940, it was presented to the public on the occasion of the Moscow Troop Parade over Red Square .

In the same year, under the impression of the German dive fighters , especially the Ju 87 , the demand was made to convert the DB-LK into a Stuka. This resulted in a dummy with dive brakes, automatic interceptors and external bomb suspensions. The decision to build a prototype of this design failed when the Great Patriotic War broke out .

The first and only prototype built was burned when the German Wehrmacht approached .

Technical specifications

Parameter Data
crew 5-6
length 9.78 m
span 21.60 m
height 4.70 m
Wing area 56.87 m²
Wing extension 8.2
Empty mass 5655 kg
Takeoff mass 9061 kg
Engines two 14-cylinder double radial engines M-87B with 700 kW (952 PS) each
Top speed 395 km / h near the ground
488 km / h at an altitude of 5100 m
Service ceiling 8500 m
Range 1270 km with 2000 kg bomb load
2900 km with 1000 kg bomb load
Armament four SchKAS -MG in the rear of the fuselage, one MG to be operated from the navigator to the front

See also

literature

Web links

Commons : Belyaev DB-LK  - collection of pictures, videos and audio files

Individual evidence

  1. ^ "St": Military aircraft with the Red Star: Beljajew DB-LK . In: Flieger Revue . No. 2/1971 , p. 78 .