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Photo taken in Gruyere (Switzerland) in the 80ies, Pilot and owner Stephen Grey...The Bu 133 was a development of the Bucker Bu 131 Jungmann two-seat basic trainer. First flown in 1935 (by Luise Hoffmann, the first female works pilot in Germany), it was slightly smaller than the Bu 131. The prototype, D-EVEO, was powered by a 140 hp (104 kW) Hirth HM506 inverted, air-cooled inline-6 engine. The aircraft showed "astonishing agility" at its first public appearance, the 1936 International Aerobatic Championship at Rangsdorf, but the Bu 133A garnered no orders; only two Bu 133Bs, with 160 hp (119 kW) Siemens-Bramo Sh 14A radials, were built...The main production type was the Sh 14A-powered Bu 133C, which had a distinctive cowling and a 13 cm (5.1 in)-shorter fuselage, and the same fine aerobatic performance as the Bu? 133A..(Wikipedia)