by Horst Zoeller, 1996 - 2017, 61st Edition, 26 August 2017

Junkers EF Project Designs

 

The EF Designator means "Entwicklungs-Flugzeug" (Development Aircraft). It was used at the Junkers Construction Office during the early stage of aircraft design. Later the "EF" Designs were handed over to the design Office and got the "Ju" Designator plus a numeric Designator issued by the RLM. During the late stage of WWII the "EF" Designator was still used for the design and prototyping Phase (EF126 and later). Some late EF Designs were later flown in Russia under EF Type Designators.

It is not known, when the EF Designator System was introduced. Günter Frost expects, that the EF was first used somewhere between 1923 and 1924. The EF140 seems to be the first EF number exclusively used by the OKB-1 in Podberesje in Russia without any previous use at the Junkers facility in Dessau. EF140 to EF151 were used exclusively in Russia, while the EF152 to EF160 were basicly developed in Russia but then transfered to VEB Flugzeugbau in Dresden. It seems, that the Dresden EF numbers ended with EF160

The EFo Designator was completely Independent from the EF Designators. It was used by the Junkers Research Department and means "Forschungsvorhaben" (Research Project). EFo numbers were known in a wide range, but only a few Projects refered to complete aircraft designs. Most Projects were focused on component and Equipment Trials.

EFo Aircraft Studies

 

EF Designators

EF Numbers above 139 were used in Russia exclusively
(These aircraft and aircraft Projects are listed in the Junkers Post War Developments Directory)

  • EF-140 (OKB-1) - two engine Jet bomber  further development of EF131 in Russia
  • EF-141 - nothing known, probably not used
  • EF-142 - nothing known, probably not used
  • EF-143 - nothing known, probably not used
  • EF-144 - nothing known, probably not used
  • EF-145 - probably a Junkers Ju88 or Ju388 testbed at OKB-1 (according to CIA Report)
  • EF-146 - nothing known, probably not used
  • EF-147 - nothing known, probably not used
  • EF-148 - nothing known, probably not used
  • EF-149 - nothing known, probably not used
  • EF-150 (OKB-1) - two engine Jet bomber, further developement of the Junkers EF140 in Russia
  • EF-151 - nothing known, probably not used

EF Numbers above 150 were basicly developed in Russia and built in Dresden
(These aircraft and aircraft Projects are listed in the Junkers Post War Developments Directory)

 

introduced Aug 2017
http://hugojunkers.bplaced.net/
contents last updated 18.08.2017