The Bucker Bu 133 Jungmeister was an advanced trainer of the Luftwaffe in the 1930s. It was a single-engine, single-seat biplane of wood and tubular steel construction and covered in fabric. 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) version of that same Hirth HM506 inline-6 engine, were built. The main production type was the 160 hp (119 kW) Siemens-Bramo Sh 14A radial 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.
1. Bu-133B, YR-PAX, Alex Papana, Romania aerobat ace, Cleveland Air races 1937
2. Bu-133B, D-EAKE, Walo Hornig, 1936
3. Bu-133A, Legion Condor, Spain 1938
4. Bu-133A, Luise Hoffman, Rangsdorf 1935, Walo Hornig, Laussane 1935
5. CASA 1131L, Spain 1940