It was foreseen several variants of the aircraft, which are different, in the main, accommodation engines:
— two turbojet engine under the wing, and two — on the sides of the fuselage at the bow;
— two turbojet engine under the wing;
— four turbojet engine under the wing by two motors in 2-bundles;
— 6 turbojet engines under the wings of three motors in 2-bundles.
Also discussed are other accommodation options engines. Increasing capacity for growth was conducted flight characteristics of aircraft. For example, filled with six turbojet engines Ju-287V3 had to develop speed about 850 km / h, to have a bomb load of three thousand kg range 6.65 kilometers. All versions of the aircraft, except Ju-287V1, had retractable landing gear.
Shestidvigatelnaya modification of the aircraft in the spring of 1945 came at the disposal of the Red Army. Apart from it, the Russian got a few other projects and airplanes Junkers. German designers have proposed to bring the plane and transfer it to the flight tests. But then the ending recognized useless, and in 1948 the work done, as by this time were new, the highest tactical and technical requirements. This plane the OKB-1 was designated EF-131 ("131").
Followed by the development of OKB-1 became the high-rise bomber EF-140 ("140"), which had a tighter scheme, but calculated on a transonic speed. Limiting speed supersonic flight could be respectively 1.1 M. The plane detail redesigned with increased strength and substitute 6 German turbojet engines with 2 engines AM-01 design Mikulino A. According to the plan "140" could be used not only for the main purpose, and as far-weather spy why in the bomb bay provided for the suspension of photographic equipment. Was introduced two firing points — twin 23-mm gun mounted in the fairing rotating towers. The towers were remote hydraulic control. The cabin had a significant windows providing a good overview of the side and front, on top at the end of two mirrored glass were mounted periscope providing visibility to the rear. The engines were fixed at 40 per cent semi-span from the axis of the aircraft to the hanging frames. Under the front spar of the wing was out of nozzles. Shoulder removal c. that is calculated from the turbojet engine test flutter. The aircraft had a retractable tricycle landing gear with nose wheel. Aileron gap with aerodynamic compensation. Area of 3.25 m2 each. Retractable flap area 7.56 m2. To loosen the root stall at large angles of attack near the fuselage at the front edge of the wing slats were small.
Aircraft wing cross was +5' V, 2.57 narrowing and elongation of 6.45. Estimated load factor — 6.25, with gross weight of 24 thousand kilograms of greatest congestion was 4.16. Area rudder — 2.8 m2, the keel — 3.5 m2, elevator — 3.9 m2, stabilizer -8 m2.
Engines AM-01 AA Mikulin provided for the aircraft to date have not been set, they have been modified with 2 «Nene» (Russian designation for the RD-45). With all of this have been some changes in size of the aircraft and, in the views of the majority, aggravated his future properties because the thrust of each engine turbojet decreased to 2,270 from 3,500 kgs.
First flight EF-140V1 held on 15.03.1949 at Moscow airport in Podberezye. Lead engineer for flight tests, and the construction was GN Nazarov. Lead Test Pilot — Wolfgang Tsize, during the last war chief pilot Hermann Goering. During the 1 st of the flights could achieve a speed of 900 km / h EF-140 ("140"), in contrast to past aircraft developed in the Russian Union from scratch. Chief designer of the bombers — Brunolf Baade, deputy head designer — Obrubov and Freitag. Vokke — Head Office new projects. Second experienced plane, which had some differences, was not built.
Aircraft performance properties of an experimental high-altitude bomber "140":
Wingspan — 19.4 m;
Length — 19.7 m;
Height — 5.7 m;
Wing Area — 58.4 m2;
Empty weight — 12500 kg;
Normal takeoff weight — 24500 kg;
Most takeoff weight — 27000 kg;
Motor Type — 2 turbo-jet engine AM-01 Mikulino AA;
Thrust — 2 x 3500 kg;
Most speed — 1230 km / h;
Range — 6500 km;
Service ceiling — 16,000 m;
Crew — 4 people;
Armament — 4 23-mm cannon;
Bomb load — 4500 kg.