Trainer aircraft First flight: 1934 Bücker

The Bü-131A, the company's first model, was also the last biplane built in Germany. The aircraft had two open cockpits in tandem and fixed landing gear. The fuselage was tubular steel, covered with fabric and metal, the wings were made of wood and fabric. An 80-horsepower (60 kW) Hirth HM 60R was installed as a power plant.

The Bü 131B followed in 1936 with a more powerful 105 hp Hirth HM 504A-2 engine. (78 kW).

The first production version of the Bü 131A proved to be a very successful machine. Aircraft of this type were built not only for civilian flight schools in Germany, but were also intensively used in the Luftwaffe. Training biplanes were exported to eight European countries. The largest importers were Hungary (100 aircraft) and Romania (150), another 75 aircraft were assembled under license in Switzerland. Mass production under license was carried out in Japan, where 1037 Nippon Kokusai Ki-86a aircraft were built, which entered service with the Imperial Army Aviation under the designation Type 4 Primary Trainer. The first army series was followed by a series for naval aviation, which received the designation Navy Type 2 Trainer Model 11 (or K9W1 Momiji); aircraft were built at the factories "Hitachi" and "Kyushu". The exact number of aircraft built for the Japanese Navy is not exactly known, but approximately - from 217 to 339.

The Jungmann aircraft was used by the Luftwaffe throughout the Second World War, although it was created to replace the more advanced Bu 181. Both types of aircraft were used even at the front in night bomber units and for fighting partisans. Aircraft armed with one- and two-kilogram bombs were used for harassing night raids on Soviet troops. A large number of aircraft survived the war, and in Czechoslovakia, the Aero company continued to mass-produce Jungmann in the 1950s under the designation C-4 (C-104).

Modifications

• Bü.131A - initial modification.
• Bü.131B - improved version with a more powerful Hirth HM 504A-2 engine
• Bü.131C is the only copy; version with 90 hp Cirrus Minor in-line engine

Photo	Description
	Drawing Bü.131 B

Trainer aircraft First flight: 1935 Bücker

There were so many orders for the Bü 131 Jungmann that soon the plant in Johannishtal could not cope with them. A new plant was built in Rangsdorf, and Bücker began designing a single-seat trainer based on the Bü.131.

The design and layout of the Bü 133 Jungmeister inherited from its predecessor, but differed in smaller dimensions and a 135 hp Hirth HM 6 engine. The reduction in size, combined with an increase in engine power, had a positive effect on the flight performance of the aircraft. According to the test results, the aircraft was recommended for mass production as an aircraft for advanced training of pilots and an aircraft for initial training in air combat.

The first production version was designated Bü 133A. The number of aircraft built for the Luftwaffe is not exactly known. About 50 machines were assembled by Dornier-Werke in Switzerland for the Swiss Air Force, about the same number - by CASA for the Spanish Air Force.

They also produced two more modifications of the aircraft - Bü 133B Jungmeister: the designation of aircraft built under license, with Hirth HM 506 engines with a power of 160 hp. With. (119 kW) and Bu 133C Jungmeister: the most massive production version with a Siemens Sh 14A-4 star motor.

Modifications

• Bü.133A - initial modification.
• Bü.133B - the designation for license-built versions with a 160 hp Hirt HM 506 inline engine. c.
• Bü.133C is the designation for the main production version, which has a Siemens Sh 14A-4 radial engine.

Photo	Description
	Drawing Bü.133 B

Bibliography

• Bücker Bü 131 Jungmann /de Agostini. World Aviation./
• Bücker Bü 133 Jungmeister /de Agostini. World Aviation./
• Bücker Bü 131 Jungmann/Flugzeug Profile 27. Ervin König./
• Bücker Bü.133 Jungmeister /Flight Journal. Budd Davisson./