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OKB-1 EF-140

Soviet Union (1948)
Picture of OKB-1 EF-140 Jet-Powered Tactical Fast Reconnaissance / Bomber Prototype

The Soviet OKB-1 EF-140 jet-powered bomber prototype emerged from work immediately done after the close of World War 2.


Detailing the development and operational history of the OKB-1 EF-140 Jet-Powered Tactical Fast Reconnaissance / Bomber Prototype.  Entry last updated on 4/5/2016. Authored by Staff Writer. Content ©www.MilitaryFactory.com

The EF-140 was a Soviet post-World War 2 jet-powered tactical bomber design continuation of the line begun with the capture of the German Junkers Ju 287. The Ju 287 was one of the more unique of the German wartime jet-powered aircraft in development before the close of the war in 1945 - particularly in its use of advanced swept-forward wings as well as jet propulsion technology. The Junkers product was furthered into the local Soviet "EF-131" which completed a hasty first flight in 1946 with more formal testing had in 1947. Though the project was terminated in 1948, the second airframe of the EF-131 made up the basis for the evolved EF-140.

The EF-140 initially existed as a tactical bomber like the EF-131 before it. However, whereas the EF-131 relied on now-obsolete German Junkers Jumo turbojets (a total of six such systems powered the original aircraft), the EF-140 introduced Soviet engines of a more advanced, capable nature. Design of the new aircraft commenced in 1947 and the EF-131 was modified to carry 2 x Mikulin AM-TKRD-01 axial flow turbojet engines. The forward-swept wings remained in play with the engines slung underneath and the crew of three was increased to four. Dimensions included a length of 62 feet, a wingspan of 71.8 feet and a height of 18.5 feet. Fixed armament became four guns (largely defensive in nature) with two guns held in a dorsal barbette and two guns fitted to a ventral barbette. Both barbettes would be remote-controlled and aimed by way of periscopes. An internal bomb bay would hold several thousand pounds of conventional drop ordnance.

The initial EF-140, born from the second EF-131 prototype while carrying the Mikulin engines, was made ready for September 1948 and completed its first flight on September 30th. From this, thought came to rework the EF-140 as a tactical fast-reconnaissance platform and this produced the "EF-140R" model in turn. Engines were changed to 2 x Klimov VK-1 units (5,950lb thrust each) and wingtip fuel tanks were added to increase operational ranges. Other refinements were enacted on the overall design including revised turrets.

Flight testing at GOZ-1 revealed issues with wing flutter which brought the design back to the engineering boards. The final iteration of the line came in the proposed "EF-140B/R" which was to be a fast-reconnaissance platform with bombing capability as secondary. The engines remained the same Klimov units as in the earlier model and the program progressed enough to begin ground testing before the end. However development was terminated on both prototypes in June of 1950 in favor of more advanced, capable bomber / reconnaissance platforms.

Any available statistics for the OKB-1 EF-140 Jet-Powered Tactical Fast Reconnaissance / Bomber Prototype are showcased in the areas immediately below. Categories include basic specifications covering country-of-origin, operational status, manufacture(s) and total quantitative production. Other qualities showcased are related to structural values (namely dimensions), installed power and standard day performance figures, installed or proposed armament and mission equipment (if any), global users (from A-to-Z) and series model variants (if any).






Our Data Modules allow for quick visual reference when comparing a single entry against contemporary designs. Areas covered include general ratings, speed assessments, and relative ranges based on distances between major cities.

Image of collection of graph types

Relative Maximum Speed Rating
Hi: 750mph
Lo: 375mph
    This entry's maximum listed speed (522mph).

    Graph average of 562.5 miles-per-hour.
Relative Operational Ranges
NYC
 
  LON
LON
 
  PAR
PAR
 
  BER
BER
 
  MOS
MOS
 
  TOK
TOK
 
  SYD
SYD
 
  LAX
LAX
 
  NYC
Graph showcases the OKB-1 EF-140R's operational range (on internal fuel) when compared to distances between major cities.
Aviation Era Impact
Pie graph section
Pie graph section
Pie graph section
Pie graph section
Pie graph section
Useful in showcasing the era cross-over of particular aircraft/aerospace designs.
Unit Production Comparison
Comm. Market HI*: 44,000 units
Military Market HI**: 36,183 units
2
2


  * Commercial Market High belongs to Cessna 172.

  ** Military Market High belongs to Ilyushin Il-2.


Altitude Visualization
Small airplane graphic
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Supported Mission Types:
Air-to-Air
Interception
Unmanned
Ground Attack
Close-Air Support
Training
Anti-Submarine
Anti-Ship
Airborne Early Warning
MEDEVAC
Electronic Warfare
Maritime/Navy
Aerial Tanker
Utility/Transport
Passenger Industry
VIP Travel
Business Travel
Search/Rescue
Recon/Scouting
Special Forces
X-Plane/Development
National Flag Graphic
National Origin: Soviet Union
Service Year: 1948
Classification Type: Jet-Powered Tactical Fast Reconnaissance / Bomber Prototype
Manufacturer(s): GOZ-1 - Soviet Union
Production Units: 2
Global Operators:
Soviet Union (cancelled)
Structural - Crew, Dimensions, and Weights:
Unless otherwise noted the presented statistics below pertain to the OKB-1 EF-140R model. Common measurements, and their respective conversions, are shown when possible.

Operational
CREW


Personnel
4


Dimension
LENGTH


Feet
63.16 ft


Meters
19.25 m


Dimension
WIDTH


Feet
71.75 ft


Meters
21.87 m


Dimension
HEIGHT


Feet
18.54 ft


Meters
5.65 m


Weight
EMPTY


Pounds
32,353 lb


Kilograms
14,675 kg


Weight
LOADED


Pounds
56,317 lb


Kilograms
25,545 kg

Installed Power - Standard Day Performance:
2 x Klimov VK-1 turbojet engines developing 5,950 lb of thrust each.

Performance
SPEED


Miles-per-Hour
522 mph


Kilometers-per-Hour
840 kph


Knots
454 kts


Performance
RANGE


Miles
2,237 mi


Kilometers
3,600 km


Nautical Miles
1,944 nm


Performance
CEILING


Feet
46,260 ft


Meters
14,100 m


Miles
8.76 mi

Armament - Hardpoints (0):

STANDARD:
2 x 23mm cannons in dorsal turret
2 x 23mm cannons in ventral turret

OPTIONAL:
Up to 8 x 220lb bombs carried.
Visual Armory:

Graphical image of an aircrat automatic cannon
Graphical image of an aircraft conventional drop bomb munition
Variants: Series Model Variants
• 140 - Base Series Designation; fitted with 2 x Mikulin AM-TKRD-01 turbojet engines.
• 140-R - Reconnaissance conversion of the 140; fitted with Klimov VK-1 series turbojet engines.
• 140-B/R - Second prototype; reconnaissance-bomber form.