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OKB-1 EF-131


Jet-Powered Tactical Bomber Prototype


The captured German wartime Junkers Ju 287 jet bomber served as the basis for the Soviet post-war OKB-1 EF-131 prototype.
Authored By: Staff Writer | Edited: 7/30/2018
National Flag Graphic

Specifications


Year: 1947
Manufacturer(s): GOZ-1 - Soviet Union
Production: 2
Capabilities: Ground Attack; X-Plane;
Crew: 3
Length: 67.16 ft (20.47 m)
Width: 63.65 ft (19.4 m)
Height: 18.70 ft (5.7 m)
Weight (Empty): 26,235 lb (11,900 kg)
Weight (MTOW): 50,607 lb (22,955 kg)
Power: 6 x Junkers Motoren Jumo 109-004 turbojet engines developing 1,985 lb of thrust each.
Speed: 534 mph (860 kph; 464 kts)
Ceiling: 41,010 feet (12,500 m; 7.77 miles)
Range: 1,063 miles (1,710 km; 923 nm)
Operators: Soviet Union (cancelled)
In their historic advance on Berlin during World War 2 (1939-1945), the Soviet Army captured the remnants of the Junkers Ju 287 jet-powered tactical bomber and, with it, an important stepping stone towards advanced jet-powered flight. The Ju 287 was unique not only in its reliance on turbojet propulsion but also in its use of swept-forward wing mainplanes. Just one of the type was completed and a first flight held on August 8th, 1944 while a second (V2) and third (V3) prototype lay unfinished at war's end. The program was more or less taken up by the Soviets to become the OKB-1 "EF-131" prototype of which two were eventually completed though the product was not adopted for serial production.

The Ju 287 V2 and V3 prototypes were used as the basis for the Soviet EF-131 bomber and the V3 proved the more important form despite being the least complete of the two as it mimicked the intended pre-production model for the Ju 287 series. By all accounts, the EF-131 was a near copy of the V3 and is said to have been hastily completed to accomplish a basic first flight during 1946, this conducted over Soviet-occupied Germany before being broken down and shipped to the Soviet Union for proper evaluation. The product was given more attention at GOZ-1 by both German and Soviet engineers with the goal to showcase the product in the 1947 Tushino display.

Despite the goal, the technologically-advanced aircraft was not readied in time and did not record an official first flight until May 23rd, 1947. Program delays and dwindling interest in the aircraft eventually led to its abandonment and subsequent termination in 1948 as Soviet authorities pushed other, more potent, products with better potential. The "EF-140" (detailed elsewhere on this site) became a related offshoot of the EF-131 program but managed little more for its time in Soviet military aviation history.

As completed, the EF-131 exhibited a length of 67 feet, wingspan of 65.6 feet and height of 18.7 feet. Its standard operating crew was three and power was served through 6 x Junkers Jumo 109-004 engines of 1,984lb thrust each. Maximum speed was reported to be 535 miles per hour with a range out to 1,065 miles and a service ceiling of 41,000 feet. Proposed armament was 2 x 13mm heavy machine guns held in a remote-controlled tail barbette while up to 4,400lb of drop ordnance was to be carried in an internal bomb bay.






Armament



PROPOSED, STANDARD:
2 x 13mm heavy machine guns in remote-controlled tail barbette.

PROPOSED, OPTIONAL:
Up to 4,400 lb of conventional drop bombs carried in an internal bomb bay.

Graphical image of an aircraft medium machine gun
Graphical image of an aircraft heavy machine gun
Graphical image of an aircraft conventional drop bomb munition

Variants / Models



• EF 131 - Base Series Designation; two examples are said to have been completed.
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