World War II Database

Contributor: C. Peter Chen

ww2dbaseThe SB (Skorostnoy Bombardirovschik, or High Speed Bomber) light bombers came out of a 1933 specification by the Soviet air force administration for a fast bomber. Alexander Arkhangelsky of Tupolev headed up the design effort, and the prototype took flight in 1934. After several prototypes, the all-metal aircraft entered production in 1935 and entered service in Feb 1936. Starting in Oct 1936, the exporting of SB bombers began, starting with Spain. The first examples of what eventually amounted to 210 SB bombers fought on the side of the Republican air force went to Spain, causing considerable frustration for the Nationalist fighters because the SB bombers could out-run many of their He-51 and Cr.32 biplane interceptors. SB bombers were also sold to the air forces of China, Czechoslovakia (both actual units and the license to build more), and others. During the Winter War between the Soviet Union and Finland in 1939-1940, SB bombers began to show obsolescence as fighter technology rapidly advanced. Efforts were made to improve the design with more powerful engines, variable-pitch propellers, and additional fuel capacity, but none of the upgrades made a significant difference. Production finally came to a stop in 1941; between 1936 and 1941, 6,656 aircraft were built, making the design the most built bomber in the world in the late 1930s. When the war with Germany began in Jun 1941, they still made up 94% of bombers in the Soviet air force. They were used extensively as a day bomber at the start of the campaign, but German Bf 109 fighters were clearly too great a threat for these aging bombers. Very soon, they were relegated to second line duties.

SB Timeline

SPECIFICATIONS

SB 2M-103

Machinery	Two Klimov M-103 liquid-cooled V12 engines (license-built Hispano-Suiza 12Ybr engines) rated at 960hp each
Armament	2x7.62mm nose ShKAS machine guns, 1x7.62mm dorsal ShKAS machine gun, 1x7.62mm ventral ShKAS machine gun, 6x100kg or 6x50kg internal bombs, 2x250kg wing rack bombs
Crew	3
Span	20.33 m
Length	12.57 m
Height	3.60 m
Wing Area	56.70 m²
Weight, Empty	4,768 kg
Weight, Maximum	7,880 kg
Speed, Maximum	450 km/h
Speed, Cruising	360 km/h
Service Ceiling	9,300 m
Range, Normal	1,600 km
Range, Maximum	2,300 km

Photographs

Visitor Submitted Comments

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1.  ALAN CHANTER says:
22 Oct 2020 12:27:22 AM

The Tupolev SB is often incorrectly referred to as the SB-2, which is a Western corruption of the designation SB-2-M100A meaning a SB with two Klimov M100A V-12 engines.