Under Baade, work continued on developing the Junkers Ju 287 jet bomber with its characteristic "forward-swept" wings, now renamed as the OKB-1 EF 131, although progress was hampered by the Soviet refusal to allow the German engineers near the military airfield used to test the prototypes. The project was abandoned in June 1948. The final prototype was adapted for use in the OKB-1 140 programme. The other principal project of Baade's team of involuntary expatriates was the OKB-1 150, a jet bomber on which serious work began in 1948. The design incorporated innovative ideas on materials and design. As with the earlier project, progress was hampered by the inconsistent nature of support from the Soviets in obtaining materials and permitting the German expatriates the freedom necessary to develop and test the aircraft effectively. By 1951, the OKB-1 150 had been developed into a heavy bomber with a range around 1,500 km and a bomb capacity around 600 kg, but in 1952, this project, too, was abandoned, as resources were again reprioritized.
