Junkers EF designations

[Jemiba]

The same as for the "EFo" series, again all pictures (in low res only) are from Wolfgang Wagners
book "Hugo Junkers. Pionier der Luftfahrt - seine Flugzeuge"

EF 50 maybe racer or record aircraft
EF 53 4-engined long range passenger aircraft
EF 55 used to measure the effects of negative sweep angles, pre-study for Ju 287, 1943/44
EF 56 used to measure the effects of positive sweep angles, pre-study for Ju 287, 1943/44

 

[Jemiba]

EF 57 used to measure the effects of positive sweep angles and wingtips with dihedral, 1943
EF 58 elliptical wing model, 1943
EF 59 4-engined jet aircraft with negative sweep angle, already similar to Ju 287
EF 60 see EF 127

 

[Jemiba]

EF 61 high-altitude bomber
EF 62 single seat, tailless fighter with jet engine (see EF 62 and EF 128), 1944
EF 63 single seat, tailless fighter with jet engine (see EF 63 and EF 128), 1944
EF 65 single engined attack aircraft
EF 66 used to find the optimal layout for Ju 287
EF 68 used to measure the optimal position for jet engines
EF 71-5 twin-boom model, used for wingtip vortex research

 

[Jemiba]

EF 72 Ju 252
EF 73 study, which led to the Ju 88
EF 77 probably Ju 352
EF 82 ground attack a/c/dive bomber (see post about the EF 82)
EF 94 transport glider Ju 322 Mammut

 

[Jemiba]

EF 100 long range passenger aircraft, 1940
EF 101 large a/c for carriage of a recce a/c underneath, 1942
EF 112 twin engined midwing bomber, no data
EF 116 used to measure the effects of different sweep angles, 1943

 

[Jemiba]

EF 122 layout, that led to the Ju 287 ((EF numbers in the 50/60 range were used, too !)
EF 126 "Elly", pulse jet powered attack/fighter a/c"
EF 127 "Walli", rocket powered short range interceptor (identical to EF 60 ?)"
EF 128 single seat, tailless fighter with jet engine (see EF 62 and EF 63), 1944

 

[Jemiba]

EF 130 four jet engines powered flying wing bomber
EF 131 development of the Ju 287
EF 132 development of the Ju 287 with swept back wings
EF 135 probably development of the EF 130 flying wing with jet and piston engines

 

[Jemiba]

EF 140 fast recce a/c based on the EF 131
EF 150 bomber with swept wings and two jet engines

Thought about posting this in the Designations section, but as it aren't actual or type numbers,
I decided, that it better fits here.

Ok, any additions welcome !

 

[blackkite]

Amazing! Thanks for sharing us.

 

[richard]

And the EF 123 : Master194.com • Afficher le sujet - Luft46 Arado Ar P 580, Planet Model, microbe terminé
EF 137: Images & Planes

 

[Stargazer]

Amazing designs! Thanks for bringing it all together here.

 

[theponja]

Another great post Jemiba.

Maybe someone has a 3d view of EF-137?

Regards
Alcides

 

[Flitzer]

Together with Eo thread,
I could be busy for the rest of my life.


Brilliant work. Big thank you.


P

 

[hesham]

As I know;


EF-135 was twin boom fighter project.


EF-144 was swept wing fighter project.

 

[toura]

HI Jens
2 EF 112 ?
yours and a twin booms attacks bomber ?
Bye

 

[Tophe]

Here are the twin-boom EF-50/112/135 as depicted in my books "Forked Ghosts" (downloadable for free at http://cmeunier.chez-alice.fr/Free_EoFG_MV.htm ). I think the 135 is provisionnal derivative, not reference.
I'd be very interested to see the EF-71-5. If there is no picture at all, I may invent one for my what-if friends on another forum...

 

[Tophe]

EF 68 used to measure the effects of positive sweep angles, pre-study for Ju 287
EF 71-5 twin-boom model, used for wingtip vortex research

The caption on your EF-68 picture told me (with Google translate): "search for gun system of jet engines distance from the trunk", so it seems the goal of this model was the jet weird (asymmetric?) position, like a belt of engines that can be rotated in different positions for tests, no?

 

[Jemiba]

Sorry, I think no, but thanks for the clue, I noticed, that I had forgotten to include the EF 66
and wrote its explanation to the EF 68!
The EF 68 was simply used to determine the best position for mounting jet engines on a multi-
engined aircraft, the caption speaks of " the optimal distance to the fuselage".
But as I just wrote in the EF thread, those captions aren't part of the original photo, but the
come from the author of that book, so probably often they are just his interpretation. And that
gives some hope for us, for finding more interesting ones !
For example, I honestly don't believe in the EF 50 as a racer. Those huge props won't make any
sense to me, so the description as a VTOL, or at least ultra-STOL aircraft seems to be more
plausible to me.

 

[richard]

I can't remember the source : 3 EF , challenger of the Dornier P.231 ( Do 335 ) :

 

[Tophe]

Obviously, there are discrepant sources. But "German jet genesis" (David Masters, Jane's 1982) says that "several designs were produced under the (same) designation"...

 

[Jemiba]

There certainly are LOTS of discrepancies ! Nevertheless, that different designs were made
using the same designations, I don't believe. But there may have been EF- and EFo-numbers
mixed up. And as the "EF 71-5" seems to indicate, there may have been subvariants to designs,
using the same basic number. Those designs shown by richard could be a typical case, to my
opinion, as they are basically similar. So, a layout with a single fuselage and another with twin
booms, both using the same basic number cannot generally be ruled out, I think.

 

[richard]

J.M CUNY ,in one of its excellent books wrote than Hertel designed the Junkers EF-230 flying wing .
In the "Geheimprojekte der Luftwaffe" Bd 2 , a big flying wing is illustrated , very similar to the Hertel HTL "Transozeanflugzeug " of 1946 : this should be the EF-230

After the war , Hertel worked at the SNCA Sud-Est and designed the SE-1800 , SE-1801 and SE 1802 flying wings , all similar to the EF-230 ( or Hertel HTL )

 

[Jemiba]

Probably the EF-designations weren't (at least not always) used chronologically. The EF-94,
that led to the Ju 322 stems from 1941, where as even the first studies leading to the
Ju 287 couldn't have been made before 1943, but carried designations in the 50s range.

In the thread about the EF/EFo-designations in the Flugzeugforum Peter Achs posted a
photo of a windtunnel model of the twin jet-engine pylon intended for the EFo 12, which
should carry the landing gear, too. It looks different to the 3-view, we've seen before,
so may be interesting here, too.

 

[GTX]

The EF 50 is quite interesting - anyone know anything more of it?

 

[redstar72]

Maybe someone has a 3d view of EF-137?

EF-137 3-view and some info from "Soviet secret projects - Fighter since 1945", by T. Buttler and Ye. Gordon (ISBN 1 85780 221 7).

 

[redstar72]

More correct EF-131 and EF-140 3-views, and some photos of the latter.

All is from the book "German trails in Soviet aviation history" (Немецкий след в истории советской авиации) by Dmitry Sobolev (Moscow, Aviantik, 1996).

 

[famvburg]

Unless you got these elsewhere, they were in a very old, like 1974 or 1975 maybe, issue of Wings or Airpower. The EF 130 is one of my favs.

I can't remember the source : 3 EF , challenger of the Dornier P.231 ( Do 335 ) :

 

[redstar72]

EF-132 from Sobolev's book...
... and totally different EF-132 from book by Holger Lorenz about Baade VEB-152!

Who is right? Or is "Sobolev" version early configuration of the project, and "Lorenz" version (looking much less German and more Soviet) the late one?

 

[Jemiba]

In his book, Lorenz says, that the EF-132 should fly in 1947, but the disassembly and reassembly of
the Junkers factories in the SU prevented the completion, so the Junkers design office was used as design
team for other soviet manufacturers. As an evidence Lorenz points at the similarity between the EF-132B (!)
and the Mjassitschew M-4 and the Tupolev Tu-16. So, the EF-132B is said to be a development of the EF-132.

 

[Justo Miranda]

Additional drawings

 

[Justo Miranda]

Additional drawings

 

[Justo Miranda]

Additional drawings

 

[fightingirish]

EF-132 from Sobolev's book...
... and totally different EF-132 from book by Holger Lorenz about Baade VEB-152!
Who is right? Or is "Sobolev" version early configuration of the project, and "Lorenz" version (looking much less German and more Soviet) the late one?

See also Lorenz other German book "Kennzeichen Junkers" at this page!

 

[Artie Bob]

IIRC, the Luftfahrt International N°33 drawings are from a JFM brochure made in 1938. The two aircraft are quite different designs and the shorter wing version looks more like the early Ju 288 concepts, possibly some first iterations of EF 73, but perhaps a project number between EF 61 and 73. Based on all the references to EF numbers from JFM documents, every EF designation I have come up with thus far appears to be be in numeric, chronological sequence. For Example, EF 109 to EF 112 are all Piston engine Schnellstbomber designs from 1942 which fits with the EF 100 & 101 and EF 122,126, etc.
Best Regards,
Artie Bob

 

[Jemiba]

...Based on all the references to EF numbers from JFM documents, every EF designation I have come up with thus far appears to be be in numeric, chronological sequence. ..

That's principally what Petre Achs told me, too, with the ecception of the EF 94 (later Ju 322),
which raises some doubts, either of the correctness of this number (maybe it's a typo), or even
on the authenticity of the drawing.

 

[Wurger]

Hi guys,
why not making a EF listing? That would be helpful in organizing our knowledge.

 

[Jemiba]

Hi guys,
why not making a EF listing? That would be helpful in organizing our knowledge.

Tried to post it as Excel-(xls)-file, but as that doesn't work, here's a list as txt, with tabstops
between designation and description, so importing into Excel is easy.
Additions, corrections and clues welcome !

 

[Stargazer]

Hi guys,
why not making a EF listing? That would be helpful in organizing our knowledge.

Been working at it myself, but it's nowhere near ready yet...

 

[borovik]

Ju EF-52
from Jet & Prop #5-2004

 

[Jemiba]

Great find Brovik ! Seems to be closely related to the Ju 86.
My only problem is, that, judging the number, those designs may date from around
1942 ? That seems to be a bit late for such a Ju-86 derivative.