Hugo Junkers (3 February 1859 – 3 February 1935) was a German aircraft engineer and aircraft designer who pioneered the design of all-metal airplanes and flying wings. His company, Junkers Flugzeug- und Motorenwerke AG (Junkers Aircraft and Motor Works), was one of the mainstays of the German aircraft industry in the years between World War I and World War II. His multi-engined, all-metal passenger and freight planes helped establish airlines in Germany and around the world. In addition to aircraft, Junkers also built both diesel and petrol engines and held various thermodynamic and metallurgical patents. He was also one of the main sponsors of the Bauhaus movement and facilitated the move of the Bauhaus from Weimar to Dessau (where his factory was situated) in 1925. Amongst the highlights of his career were the Junkers J 1 of 1915, the world's first practical all-metal aircraft, incorporating a cantilever wing design with virtually no external bracing, the Junkers F 13 of 1919 (the world's first all-metal passenger aircraft), the Junkers W 33 (which made the first successful heavier-than-air east-to-west crossing of the Atlantic Ocean), the Junkers G.38 "flying wing", and the Junkers Ju 52, affectionately nicknamed "Tante Ju", one of the most famous airliners of the 1930s. When the Nazis came into power in 1933, they requested Junkers and his businesses aid in the German re-armament. When Junkers declined, the Nazis placed him under house arrest in 1934 and eventually seized control of his patents and company. He died the following year. Under Nazi control, his company produced some of the most successful German warplanes of the Second World War.
Biography Junkers was born in Rheydt in the Prussian Rhine Province, the son of a wealthy industrialist. After taking his Abitur exams in 1878, he attended the Technische Hochschulen in Charlottenburg (now Technische Universität Berlin) and Aachen (now RWTH Aachen), where he completed his engineering studies in 1883. At first, he returned to Rheydt to work in his father's company, but soon attended further lectures on electromagnetism and thermodynamics held by Adolf Slaby in Charlottenburg. Slaby placed him with the Continental-Gasgesellschaft in Dessau, where he worked on the development of the first opposed-piston engine. To measure heating value, Junkers patented a calorimeter and founded a manufacturing company in 1892. Junkers personally introduced the calorimeter at the 1893 World's Columbian Exposition in Chicago, where it was awarded a gold medal. The next year, he patented a gas-fired bath boiler, which he refined as a tankless heater. In 1895, he founded Junkers & Co. to utilize his inventions. From 1897, he was offered a professorship of mechanical engineering at Aachen, where he lectured until 1912. Working as an engineer at the same time, Junkers taking substantial gains of Junkers & Co. devised, patented, and exploited calorimeters, domestic appliances (gas stoves), pressure regulators, gas oil engines, fan heaters, and other inventions.
Aeronautical work
Junkers's aeronautical work began in earnest at age 50 when he worked with engineer Hans Reissner in Aachen. Reissner had developed an all-metal aircraft, on which work first started in 1909 at the Brand Heath, equipped with corrugated iron wings built by Junkers & Co. 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 at the Deutsches Museum in Munich until WWII. His firm's first military production design in 1916–17 was the armored-fuselage, two-seat, all-metal sesquiplane known by its IdFlieg designation, the Junkers J.I, considered the best German ground attack aircraft of the war. During this time, the German government's IdFlieg military aviation inspectorate forced him to merge his firm with Anthony Fokker's to form the Junkers-Fokker Aktiengesellschaft on 20 October 1917. By 1918, Junkers's firm, with its previously demonstrated preference for monoplane-pattern airframe designs, had created the world's first production low-winged, single-seat monoplane all-metal fighter aircraft, the Junkers D.I, which pioneered the use of Alfred Wilm's 1906 invention of duralumin throughout a production airframe. The D.I did not enter production until 1918. He also produced a two-seat monoplane fighter, the Junkers CL.I. Both postwar Soviet aviation pioneer Andrei Tupolev and American aviation designer William Bushnell Stout owed much to Hugo Junkers in the designs of their earlier aircraft, which benefited from Junkers's corrugated, light-metal construction technique.
The Junkers F.13 of 1919 was the first of several successful civil aircraft designs produced by Junkers Flugzeugwerke: later designs include the Junkers Ju 52/3m from 1932. Through a variety of business initiatives, Junkers was active in founding and developing airlines around the globe, initially intending to sell them aircraft. Airlines where Junkers played a pivotal role in early phases of their development include Deutsche Luft Hansa and Lloyd Aéreo Boliviano. Several business ventures failed from wider economic or political problems that hampered sound engineering plans. Junkers always had more ideas: the massive four-engined G.38, nicknamed "Der Grosse Dessauer", delivered to Luft Hansa, made no commercial trips for many months as he repeatedly recalled it to the factory for improvements. When the Nazis gained control of the German government in 1933, Junkers opposed their goal of re-armament. They responded by demanding ownership of all patents and market shares from his remaining companies, under threat of imprisonment on the charge of high treason. He was placed under house arrest in 1934 and died on the 3rd of February 1935 (his 76th birthday) after a visit from Nazi officials.
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