Bücker Bü 131 Jungmann

Updated: October 2026 – A small biplane putters over the field, flies a clean roll and then touches down softly on the grass: chances are you just saw a Bücker Bü 131 Jungmann. It was the first aircraft from the Berlin company Bücker, became the Luftwaffe’s standard trainer and was built under license in Spain, Czechoslovakia, Japan and Switzerland. Today it is among the most common historic biplanes at European vintage fly-ins. Here you will learn how the type came about, which licensed builds and replicas exist and how to reliably tell the Jungmann from the Tiger Moth, the Stearman and its sister aircraft, the Jungmeister.

What is the Bücker Bü 131 Jungmann?

The Bü 131 is a two-seat training and sport biplane with two open cockpits one behind the other. The fuselage is made of welded steel tube, covered with sheet metal at the front and fabric at the rear. The wings have wooden spars and are also fabric-covered. Both pairs of wings are slightly swept back, and both carry ailerons. That makes the Jungmann nimble and capable of aerobatics, which was by no means a given for a primary trainer at the time.

Behind the type stands Carl Clemens Bücker, a former naval aviator who had run his own aircraft company, Svenska Aero, in Sweden in the 1920s. In the early 1930s he founded Bücker Flugzeugbau in Berlin-Johannisthal; depending on the source, the year given is 1932 or 1933. From Sweden he brought the designer Anders J. Andersson, who drew almost all Bücker types. The Jungmann was the first of them.

The prototype, registered D-3150, made its first flight on April 27, 1934. In autumn 1935 Bücker moved to a new plant at Rangsdorf airfield south of Berlin. After the end of the war the company was shut down. You can find more about the company’s types on the page about the Bücker Bü 133 Jungmeister, the single-seat aerobatic successor.

From club aircraft to Luftwaffe trainer

The first aircraft went to the Deutscher Luftsportverband (German Air Sports Association), which organized flight training at the time, still in 1934. The early Bü 131 A had a Hirth HM 60 R with around 80 hp. For more power reserve, the Bü 131 B received the Hirth HM 504 A-2, an inverted four-cylinder inline engine with around 100 to 105 hp. This version became the standard.

From 1935 the Luftwaffe used the Bü 131 B as its standard primary trainer. Countless later pilots made their first solo flights and first aerobatic maneuvers in the little biplane. During the war, some units also flew the Jungmann at night as a harassment aircraft. In the later war years the low-wing Bü 181 Bestmann gradually replaced it.

Version	Engine	Notable feature
Bü 131 A	Hirth HM 60 R, around 80 hp	first series version from 1934
Bü 131 B	Hirth HM 504 A-2, around 100–105 hp	main version, Luftwaffe standard
Bü 131 C	Blackburn Cirrus Minor	one-off for testing
CASA 1.131	Hirth HM 504 or ENMA Tigre	Spanish licensed build until the early 1960s
Aero C-4 / C-104	Czech engines	Czechoslovak licensed build, C-104 until 1949
Tatra T.131	–	early Czechoslovak small series
Kokusai Ki-86	Japanese engines	Japanese Army version
Kyūshū K9W Momiji	Hatsukaze	Japanese Navy version

The performance figures are modest, but just right for a trainer: the Bü 131 B reaches around 183 km/h, cruises at about 170 km/h and lands slowly. Empty, it weighs only around 380 kilograms.

Licensed builds: Spain, Czechoslovakia, Japan, Switzerland

Like hardly any other German aircraft of the 1930s, the Jungmann was copied abroad. For spotters this matters, because a large share of the aircraft flying today did not come from Berlin at all.

Further exports went to Bulgaria, Romania, Hungary, Yugoslavia, Greece, the Netherlands and South Africa, among others. When Spain, Switzerland and Czechoslovakia retired their aircraft in the 1960s and early 1970s, many of them ended up in private hands, quite a few in the USA. That is the main reason there are so many airworthy Jungmanns today: according to English-language reference works, around 200 have survived into the 21st century.

The Swiss line is closely tied to the manufacturer Dornier, whose Swiss plant in Altenrhein delivered the majority of the A-16. At the Flieger-Flab-Museum Dübendorf, a Jungmann is part of the collection on Swiss air force history.

New engines, new Jungmanns: conversions and replicas

With the end of the Hirth engines, many owners faced a problem. A common solution was the conversion to a Lycoming flat engine, often an O-320 or O-360 according to reference works. You recognize these aircraft by a distinctly wider, flatter cowling that changes the slim nose of the original Bücker. The sound is different too: instead of the bright inline engine, you hear the typical hum of a flat engine.

Then there are true replicas:

• BP 131 (Bücker Prado, Spain): In the 1990s around twenty aircraft were built on the old CASA tooling.
• SSH T-131 (Poland): Serwis Samolotów Historycznych rebuilt the Jungmann from 1994, at first with a Walter engine, later as the T-131PA with a LOM inline engine.
• FK131 (B&F Technik): A light, modern new edition with a small Walter Mikron engine that carries the look of the Bücker into a current light aircraft class.

Many replicas look very close to the original. If you want to know exactly whether an aircraft comes from Rangsdorf, Madrid, Prague or from recent production, you cannot get around the aircraft register.

How to recognize the Jungmann on the apron

Three observations are usually enough to place a Bü 131 with confidence.

The final certainty comes from the registration. In Germany most Jungmanns fly as single-engine aircraft up to 2 tonnes with D-E…; light new editions may fall into a different class depending on their registration. What the letters tell you is explained in the article German aircraft registrations. For aircraft from Switzerland, Swiss HB registrations helps.

Jungmann, Jungmeister, Tiger Moth or Stearman?

At vintage fly-ins, training biplanes often stand in a row. The finder helps you narrow it down.

The Tiger Moth and the Boeing-Stearman Kaydet were the Jungmann’s counterparts in Great Britain and the USA. The Belgian Stampe SV.4, also a small training biplane, can look similar too. When in doubt, the registration settles the matter here as well. For a broader overview of classics in the sky, see the guide How to recognize vintage aircraft in the sky.

Where to see the Jungmann today

Your best chances are at vintage fly-ins and airfield festivals. Jungmanns often turn up there in small groups, sometimes with a Jungmeister or a Bf 108 Taifun nearby. A classic in Germany is the Hahnweide vintage aircraft fly-in; you will find more dates in the overview Airfield festivals in Germany. Which aircraft actually attend is often only settled shortly before – so always check the current program.

Away from big events, it is worth looking at small airfields with vintage aircraft clubs or owner groups. How to find such airfields and spot there in a relaxed way is explained in Spotting general aviation. For identifying other light aircraft, How to recognize GA aircraft helps.

Place	Chance of success	Why
Vintage aircraft fly-ins	high	Biplanes are part of the core program
Airfield festivals	medium	depends on the participant list, often with aerobatic displays
Small airfields with vintage aircraft owners	medium	on nice weekends, weather-dependent
Museums	certain, but on the ground	including Dübendorf and Wernigerode
Commercial airports	very low	vintage aircraft usually avoid big airfields

In museums you can find the Jungmann on the ground at the Luftfahrtmuseum Wernigerode and the Flieger-Flab-Museum Dübendorf, among others. If you are interested in the work on such classics, read on at Volunteering in aviation museums.

Photo tips for the Jungmann

The Jungmann is small, quick in turns and usually flies just above the field. A few points help.

For flying displays with aerobatics, Photographing airshows offers more tips. And if you want to identify biplanes even without eye contact, you will find approaches in Recognizing aircraft by sound.

Common mix-ups and how to rule them out

Conclusion

The Bücker Jungmann is the biplane on which many spotters practice their first vintage identifications – and at the same time one of the most rewarding. Small, swept wings, two open cockpits: that is enough for the type. It gets exciting afterward, because behind the Bücker name are originals from Berlin, Spanish CASAs, Czech Aeros, Swiss Dornier builds and modern replicas.