Junkers K 47 aircraft, naming the type the "Tien Chu". Demonstrations were also carried out in Romania, Portugal, and Latvia without any resulting orders, although one aircraft may have been purchased by Japan. Three aircraft were used by the "Reichswehr" clandestine training facility at Lipetsk and a small number of the unarmed civil version were purchased by the DVS. K 47s were also used in trials to investigate dive bombing, experiments that would be formative of Pohlmann's thinking in designing the Ju 87. Indeed, the second Ju 87 prototype was fitted with a K 47 tail. Junkers K 47 The Junkers K 47
Hugo Junkers in Dessau. The iron wings were patented one year later. Junkers had a wind tunnel built and invented a hydraulic brake. He had far-sighted ideas of metal aeroplanes and flying wings, but the necessities of the war held him back. During World War I, the government forced him to focus on aircraft production. In 1915, he developed the world's first practical all-metal aircraft design, the Junkers J 1 "Blechesel" (Sheetmetal Donkey), which survived on display in Deutsches Museum in Munich until World War II. His firm's first military production design in 1916–17 was the armored-fuselage, two-seat, all-metal sesquiplane known by