The BOK-11 was conceived as a development of the BOK-8 concept, in turn an armed military version of the BOK-7, but in this case with a new Charomsky ACh-40 diesel powerplant with mechanical supercharger and turbocharger. Initially the set of remotely controlled weapons was called BOK-11, but later the name was used for the armed aircraft, which was also sometimes named in the documents as SB (Stratospheric Bomber according to the Russian acronym for “Стратосферный Бомбардировщик »(СБ)).
Construction of the BOK-11 began in Smolensk in 1937 from specifications delivered by the VVS and confirmed on February 28, 1937. Completion of the aircraft was developed on the KB-29 in Podlipki in mid-1939.
As a difference, the pressurized cabin of the BOK-11 was designed for three people. The main task in the development of the BOK-11 was the fine-tuning of the weapon system and its remote fire control system, developed by Factory No.213. For the defense of the upper hemisphere, a synchronized installation with an electric drive was created. A remote control turret with periscope collimator was located in the lower part. The BOK-11 could carry between 500 and 1000 kg of bombs on external supports. The installation of photographic equipment in different combinations was also planned.
At the beginning of 1939 the BOK-11, with the AM-34FRN power plant, was delivered to Department 7 of the TsAGI for the installation and fine-tuning of the armament, but on May 24, together with the BOK-7, it was delivered for development. training of crews for long-haul flights. In practice, it was never equipped with weapons.
BOK-11
Powerplant: 1 Mikulin M-34FRN 890hp
Wingspan: 32.40 m
Wing area: 81.4 m²
Length: 16.00 m
Empty weight: 3900 kg
Maximum takeoff weight: 6564 kg
Speed at sea level: 240 km / h
Maximum speed at 10,000 m: 354 km / h
Landing speed: 90 km / h
Ceiling: 3800 m
Range: 2000 km
Accommodation: 3
All Aero 