Bücker Bü 131
“Jungmann”
The little open-cockpit biplane that taught the world to fly — Germany’s classic 1930s primary trainer, licence-built on four continents and still looping over airfields nearly a century later. And this is one of the very few historic types you can still book a flight in.
Bücker Bü 131 Jungmann: the biplane that taught the world to fly
In 1932 the former German naval aviator Carl Clemens Bücker came home after more than a decade abroad. During the years when the Treaty of Versailles had all but strangled German aviation, he had gone to Sweden, where he ran the aircraft manufacturer Svenska Aero and learned his trade building military machines for a foreign air force. When he returned to Germany he set up Bücker Flugzeugbau at Berlin-Rangsdorf, and he did not come alone: he brought with him a brilliant young Swedish engineer, Anders J. Andersson, who would design almost everything the company became famous for.
Their very first product, first flown on 27 April 1934, was the Bü 131 Jungmann — German for “young man,” the beginner. It was tiny, light and beautifully proportioned: a single-bay biplane with a welded steel-tube fuselage, wooden wings, fabric covering and two open cockpits in tandem. Power came from a small inverted air-cooled inline engine, a Hirth of around 80 to 105 horsepower, mounted upside-down so the cylinders hung below the crankshaft and the student had a clean view over the nose.
It could not fly fast, and it was never meant to. What the Jungmann did supremely well was teach. Its controls were light and perfectly harmonised, it gave honest warning before a stall, and it was stressed for aerobatics so a pupil could safely be shown loops, rolls and spins. It rewarded good hands and gently exposed sloppy ones — exactly what a first aeroplane should do. Andersson had built, in effect, the perfect primary trainer, and the aviation world noticed almost at once.
As Germany rapidly rebuilt its air arm through the mid-1930s, the Jungmann became the standard primary trainer of the Luftwaffe and of the civil Deutsche Verkehrsfliegerschule flying schools. Tens of thousands of pilots took their first lessons, first solos and first spins in one. Its success also spawned a smaller, hotter single-seat sibling — the Bü 133 Jungmeister (“young master”) — which went on to dominate international aerobatic competition and cemented the Bücker name.
Then the design travelled. The Jungmann was licence-built across Europe and Asia on a scale few trainers have ever matched. Spain produced it as the CASA 1.131 in very large numbers and kept the line open into the 1960s, many re-engined with ENMA Tigre or Continental flat-fours. Japan built it as the Army Kokusai Ki-86 and the Navy Kyushu K9W Momiji. Switzerland assembled it at Dornier/Doflug in Altenrhein for its own air force; Czechoslovakia continued it post-war as the Aero C-4 / C-104 and Tatra T-131; and Hungary and Yugoslavia built or flew it too.
Total production across all those lines runs into the thousands — the exact figure is genuinely uncertain and quoted very differently by almost every source, which is why any single number should be read as an estimate. During the Second World War the type stayed overwhelmingly in the training role, though individual aircraft were pressed into secondary duties: liaison and communications flying, glider-towing, and light observation. It was a teacher, not a warplane, and its documentary photographs wear the plain training markings of the era.
Most trainers are forgotten the instant their students graduate. The Jungmann was not. Its sweet handling and gentle aerobatic manners turned it into a cult classic of the vintage movement, and the sheer number built — especially the late Spanish CASAs — meant plenty survived to be restored. Today hundreds remain airworthy, from Switzerland to California to New Zealand, flown by pilots who fall in love with the same qualities that made it such a fine teacher ninety years ago.
And it is one of the very few pre-war types the public can still fly in. MiGFlug’s partner brand GoAviator offers passenger flights in a genuine open-cockpit Jungmann from Grenchen, Switzerland — you ride in the front cockpit in leather cap and goggles and choose sightseeing, aerobatics, or both. The aircraft is a Swiss Doflug-built machine from 1939; the details are below.
The company itself became a fixture of German aviation, moving to a purpose-built factory at Rangsdorf south of Berlin, where the Jungmann was joined on the line by the Jungmeister and, from 1939, the low-wing Bü 181 Bestmann monoplane trainer. For a firm that had started from almost nothing in 1932, it was a remarkable rise — built entirely on the reputation of aircraft that were a joy to fly rather than on speed or armament.
Defeat in 1945 ended German aircraft production for a decade, but by then the Jungmann had long since escaped Germany’s borders. The Spanish, Swiss, Czech and other lines kept building and flying it, and when the vintage-aircraft movement gathered pace from the 1960s onward the type was perfectly placed to be rediscovered: cheap to run by warbird standards, fully aerobatic, and available in real numbers thanks to all those licence machines. What had been a humble military teaching tool became one of the most sought-after classic biplanes in the world.
01The Bücker Bü 131 Jungmann’s two-seat layout: why it, not the Jungmeister, carries passengers today
Bücker built two famous biplanes that look almost identical to a casual eye, and they are constantly confused. The Bü 131 Jungmann is the two-seat primary trainer — student in the front cockpit, instructor behind. The Bü 133 Jungmeister (“young master”) is a smaller, more powerful single-seat aerobatic development of it. Because the Jungmeister has only one seat, it physically cannot carry a passenger — so every genuine “fly in a Bücker biplane” experience is, necessarily, a two-seat Jungmann.
GoAviator’s Grenchen aircraft is exactly that: a two-seat Bü 131 Jungmann built under licence in 1939 by Doflug (Dornier-Werke) at Altenrhein, Switzerland, carrying the Swiss military registration A-66 (works number 79). The passenger rides up front while the pilot flies from the rear seat. GoAviator’s own listing labels the machine a “Jungmann” — the two-seater — but writes the type number as “Bü 133,” which is simply an error: a Bü 133 Jungmeister could never take a passenger. What matters is that this is the two-seat Bü 131, the classic 1930s trainer this page is about.
What makes the Bücker Bü 131 Jungmann special
A featherweight built like a bridge
The Jungmann’s fuselage is a welded steel-tube frame under fabric, with fabric-covered wooden wings braced by a single set of struts and flying wires. Empty it weighs only around 390 kg. That combination — light, torsionally strong and fully stressed for aerobatics — is exactly why the type is still trusted to loop and roll after ninety years, and why so many airframes have survived to be rebuilt.
The upside-down Hirth engine
Power came from a small Hirth inverted inline-four: the HM 60R of about 80 hp in the Bü 131A, and the definitive HM 504 of about 105 hp in the Bü 131B. Mounting it inverted put the cylinders low and the propeller shaft high, giving a slim nose and an unobstructed view forward — a real advantage when a student is learning to judge a three-point landing in a taildragger.
Andersson’s magic handling
Designer Anders Andersson gave the Jungmann light, beautifully matched controls and honest stall behaviour. Pilots consistently rank it among the most delightful biplanes ever built. The same aerodynamics, shrunk to a single seat and given more power, produced the Bü 133 Jungmeister — a world-championship aerobatic star of the 1930s and proof of how good the basic design was.
02The Bücker Bü 131 Jungmann’s Hirth engine: the inverted inline-four explained
The Jungmann was built around the Hirth family of inverted, air-cooled, inline four-cylinder engines. The prototype and early Bü 131A used the Hirth HM 60R of roughly 80 hp; the definitive Bü 131B adopted the larger Hirth HM 504 of about 105 hp, which gave crisper aerobatic performance. “Inverted” means the cylinders point downward from the crankcase — a layout that keeps the propeller thrust-line high and the nose slim, improving forward view and ground clearance. It is a modest, unstressed engine that runs happily on ordinary fuel, which is part of why the type is still practical to operate. Many surviving airframes — especially the Spanish CASA 1.131s — were re-engined over the years with the Spanish ENMA Tigre or with American Continental and Lycoming flat-fours, so two “identical” Jungmanns can sound and fly noticeably differently.
03The Bücker Bü 131 Jungmann’s structure: fabric, steel tube and why it lasts
The Jungmann is a textbook example of 1930s light-aircraft construction. The fuselage is a welded chrome-molybdenum steel-tube truss, faired to shape with wooden formers and stringers and then covered in doped fabric. The wings are wooden two-spar structures, also fabric-covered, arranged as an equal-span single-bay biplane cell with N-struts and bracing wires. This makes the aircraft light and immensely repairable: a damaged tube can be cut out and re-welded, ribs can be rebuilt, and fabric can simply be renewed. It is that repairability — rather than any exotic material — that has kept so many Jungmanns flying for the better part of a century. The trade-off is maintenance: fabric ages, wood must be protected from moisture, and airframes need regular, skilled attention to stay airworthy.
04The Bücker Bü 131 Jungmann as a trainer: two open cockpits and how it taught pilots
The whole point of the Jungmann was ab-initio training — taking someone who had never flown and turning them into a pilot. Its two open cockpits sit in tandem, student in front and instructor behind, connected by a simple speaking-tube or, later, an intercom. The open layout was deliberate: it immersed the pupil in the sensations of flight and let the instructor watch head and hand movements directly. Because the aircraft was fully aerobatic yet forgiving, a syllabus could progress from straight-and-level and circuits all the way through spinning and aerobatics on the same airframe. Through the mid-1930s and into the war it was the first type flown at German flying schools, and the same qualities made it a favourite basic trainer for a dozen other air forces that bought or built it.
05The Bücker Bü 131 Jungmann’s licence variants: CASA 1.131, Ki-86, Aero C-104 and the Swiss Doflug machines
Few trainers were copied as widely as the Jungmann. Spain built it as the CASA 1.131 in large numbers and kept the line running into the 1960s, re-engining many with ENMA Tigre or, later, Continental engines — which is why a very large share of surviving “Jungmanns” are actually Spanish CASAs. Japan licence-built it as the Army Kokusai Ki-86 and the Navy Kyushu K9W Momiji (“maple leaf”). Switzerland assembled it at Dornier/Doflug, Altenrhein, for the Swiss Air Force — the source of GoAviator’s aircraft. Czechoslovakia continued production after the war as the Aero C-4 / C-104 and Tatra T-131, and Hungary and Yugoslavia built or operated it as well. Because the variants differ in engine, equipment and detail fit, headline performance and production figures vary from source to source — treat any single total as an estimate rather than a hard fact.
06The Bücker Bü 131 Jungmann in the air: what pilots say it is like to fly
Pilots who fly the Jungmann tend to run out of superlatives. The controls are light and beautifully matched, the aircraft “talks” to you through the stick, and it will loop, roll and spin cleanly on modest power while remaining forgiving of a beginner. It is slow — cruising around 170 km/h — and in an open cockpit you feel every knot of it: the slipstream on your face, the smell of the engine, the horizon tipping over the top wing. That sensory honesty, not raw performance, is the whole point, and it is precisely what a modern passenger experiences on the Grenchen flight. The lineage shows, too: the single-seat Jungmeister derived from it was a world-championship aerobatic aircraft, and the Jungmann carries the same delightful DNA in a gentler, two-seat form.
07The Bücker Bü 131 Jungmann you can fly: the 1939 Swiss Doflug airframe A-66 at Grenchen
The specific aircraft MiGFlug’s partner GoAviator flies is a genuine 1939 Bü 131 Jungmann built under licence by Doflug (Dornier-Werke) at Altenrhein, Switzerland — works number 79, originally delivered to the Swiss Air Force as A-66. Switzerland operated its Doflug-built Jungmanns as primary trainers from 1936 until 1971, an extraordinary 35-year career, after which many passed straight into private and warbird hands. This machine is now a lovingly maintained warbird flown from Grenchen, with the passenger seated in the front cockpit. You can choose gentle sightseeing over the Swiss Mittelland and Jura, a full aerobatic sequence — loops, rolls, inverted flight, Immelmanns, spins — or a mix, with flights of roughly 30 or 60 minutes priced around 430–790 CHF. It is one of the only ways left to experience a pre-war Bücker biplane exactly as its first students did.
08Bücker Flugzeugbau and Anders Andersson: the company behind the Bü 131 Jungmann
The Jungmann was the making of a company that would leave a mark on aviation far larger than its size. Carl Clemens Bücker was a First World War German naval aviator who, when post-war restrictions gutted German aircraft manufacturing, moved to Sweden and built up the firm Svenska Aero. There he honed both his engineering instincts and his eye for talent — hiring the young Swedish designer Anders J. Andersson. When Bücker returned to Germany and founded Bücker Flugzeugbau in 1932, Andersson came too, and became the creative force behind the company’s aircraft. In just a few years the pair produced the Bü 131 Jungmann, the Bü 133 Jungmeister and the Bü 181 Bestmann — a trio of trainers admired for exactly the same quality: light, honest, beautifully harmonised handling. Andersson later returned to work in Sweden, but the design philosophy he brought to Rangsdorf is why a Jungmann still feels so alive in the hands today.
09Bü 131A vs Bü 131B: the Jungmann variants and the wider Bücker family
The two principal German versions differ mainly in power. The original Bü 131A used the Hirth HM 60R of about 80 hp; the definitive Bü 131B fitted the larger HM 504 of roughly 105 hp, giving livelier climb and crisper aerobatics, and it was the B that was built and copied in the greatest numbers. Beyond Germany, the licence machines form a family of their own: the Spanish CASA 1.131 (often re-engined and produced into the 1960s), the Japanese Ki-86 and K9W Momiji, the Czechoslovak Aero C-4 / C-104 and Tatra T-131, and the Swiss Doflug/Dornier-built aircraft. It is easy to confuse the Jungmann with its stablemates, so it is worth being precise: the single-seat Bü 133 Jungmeister is the aerobatic champion derived from it, while the Bü 181 Bestmann is a later low-wing monoplane trainer — a different aircraft entirely. The Jungmann proper is always the two-seat biplane.
Bücker Bü 131 Jungmann full specifications
Baseline: the Bücker Bü 131B of 1936, the mark that made up the overwhelming bulk of German production — two open cockpits in tandem, a 105 PS Hirth HM 504A-2 inverted four-cylinder inline, wooden wings on a welded steel-tube fuselage, and no armament of any kind. Deltas for the 80 PS Bü 131A of 1934, the single Cirrus-engined Bü 131C, the late-war Bü 131D, and the licence-built Swiss, Spanish, Czech and Japanese machines are in grey. Six corrections before the figures, because almost every popular account of this aeroplane repeats at least one of them. First, the production total. "About 5,000" is the number usually printed, and it may well be right, but it cannot be arrived at by addition. The attested sub-totals — roughly 3,000 German-built, 1,037 Kokusai Ki-86 for the Japanese Army, 339 Kyūshū K9W1 for the Japanese Navy, somewhere between 530 and 555 CASA 1.131 in Spain, about 300 Bü 131D-2 built by Aero in occupied Prague, 260 Aero C-104 afterwards, 78 to 81 in Switzerland and eleven to sixteen Tatra T.131 — come to more than 5,500, while German-language references settle on about 4,200 for the whole programme. The two figures cannot both be right and the discrepancy is not mysterious: the German 3,000 almost certainly swallows the Aero occupation output, the postwar Czech and Spanish aircraft are counted in some totals and not others, and nobody has ever audited the Japanese returns. A range of 4,200 to 5,500 is the honest answer. Second, Hungary did not build the Bü 131 under licence. Hungary is routinely listed among the licensees and the claim does not survive contact with the sources. What Hungary did was buy them, in quantity: about 244 aircraft delivered between 1936 and 1942, which made the Royal Hungarian Air Force one of the two largest export customers and is a more interesting fact than a licence that did not exist. The other large customer was the Kingdom of Yugoslavia, where as many as 400 are claimed — a figure that should be treated with caution, since it rests on a single much-repeated assertion. Third, the Czechoslovak licence was trivial and the Czechoslovak production was not. Ringhoffer-Tatra at Kopřivnice built eleven T.131s before the 1938 occupation, one prototype and ten production aircraft. Aero in Prague then built roughly 300 Bü 131D-2 for the Luftwaffe under German direction, at a rate reaching 24 a month until September 1940, and after 1945 built the C-4 and then 260 Walter-engined C-104s. The T.131 is the designation everybody quotes; Aero is where the aeroplanes actually came from. Fourth, the Japanese Navy trainer. The K9W1 Momiji was designed at the Yokosuka Naval Air Technical Arsenal but built by Kyūshū Hikoki; it is properly the Navy Type 2 Primary Trainer Model 11, and the Allied reporting name Cypress was assigned to it. Calling it a Yokosuka aeroplane names the design authority, not the factory. Fifth, the Swiss numbers. Sources give 88, 84, 81 and 78, and they are counting different things. The Swiss military fleet was serialled A-1 to A-84; the first half-dozen came from Rangsdorf and the remainder, A-7 to A-84, were built at Altenrhein — which is 78, though a widely used German source prefers 81 licence aircraft against three imports. Adding a handful of aero-club machines gives the 94 sometimes quoted for the Swiss population as a whole. They flew until 1971. Sixth, CASA. Spanish production is given as roughly 530 in English sources, 555 in German ones, and 330 new-build plus thirty re-engined German aircraft in a Spanish account that is plainly counting only one production block. About 530 is the safest single figure.
Dimensions & weights
- Crew
- 2, in open tandem cockpits with full dual control Which seat is used for solo flight is not a settled matter and depends on the aircraft: German practice put the pupil in front and the instructor behind, but centre-of-gravity limits govern solo operation and modern owners of CASA 1.131s and re-engined machines differ on the answer, particularly where a heavier Lycoming has moved the empty CG forward. Anyone quoting a single universal rule for the type is quoting their own aeroplane.
- Length
- 6.62 m (21 ft 9 in)
- Wingspan
- 7.40 m (24 ft 3 in), upper and lower equal The four wing panels were designed to be interchangeable with one another. On a training aeroplane that is a maintenance decision rather than an aerodynamic one: a school with a shed full of identical panels can put a bent Jungmann back in the air the same week, and does not need to stock four different spares.
- Height
- 2.25 m (7 ft 5 in) Spanish sources give 2.4 m, probably measuring to the top of the rear cockpit coaming or with a different tail attitude.
- Wing area
- 13.50 m² (145 sq ft)
- Wing layout
- Single-bay biplane, positive stagger, 11 degrees of sweepback on both upper and lower planes, ailerons on all four panels The sweepback is the giveaway that this is a 1930s aeroplane and not a 1918 one. It is there to put the centre of lift where the designer wants it while keeping the pilot's head clear of the upper wing and his eye ahead of the leading edge — and the swept, tapered planform is a large part of why the Jungmann looks right in a way that most trainers of the decade do not. Ailerons on all four panels buy a roll rate that a primary trainer does not strictly need and that made the type an aerobatic aeroplane for the next ninety years.
- Wing structure
- I-section wooden spars, wooden ribs, fabric covering Wood in 1934 was not nostalgia. It was cheap, it did not consume the light alloys the German rearmament programme was already short of, and a wing spar could be made by a joinery shop. The Japanese went further in the other direction under wartime shortage: the Ki-86b substituted wood for the steel-tube fuselage as well.
- Fuselage structure
- Welded steel tube, metal panelling forward, fabric aft This is the single most consequential choice in the aeroplane and the reason so many are still flying. A wooden trainer fuselage rots, delaminates and eventually becomes uninsurable; a welded chrome-molybdenum tube frame can be blasted, inspected, patched tube by tube and re-covered indefinitely. Bookkeeping aside, a great many "original" Jungmanns are original in the frame and new in almost everything else.
- Undercarriage
- Divided main legs hinged to the fuselage sides with combined spring and oil shock absorbers; sprung tailwheel Divided gear, rather than a cross-axle with a skid, is the 1930s answer and it matters for the job: a pupil can land a Jungmann across a rut without folding the whole undercarriage, and the track is wide enough that the aeroplane is manageable on the ground. It is still a tailwheel biplane with a long nose and it will still ground-loop for anyone who stops flying it at the point the wheels touch.
- Empty weight
- 380 kg (838 lb) Spanish CASA 1.131s with the heavier ENMA Tigre, and modern Lycoming conversions, run substantially above this — a Lycoming O-360 installation can add 60 kg or more over the Hirth once the mount, cowling, starter and generator are counted.
- Maximum take-off weight
- 670 kg (1,477 lb) German references generally print 680 kg. The difference is trivial in itself and worth noting only because it propagates into every derived figure below.
- Useful load
- 290 kg (639 lb) of crew, fuel and oil — two men, a full tank and essentially nothing else
- Wing loading
- 49.6 kg/m² (10.2 lb/sq ft) at maximum weight The English-language specification table in wide circulation prints 46.3 kg/m², which corresponds to a gross weight of 625 kg rather than 670 kg and does not match its own table. Fifty kilogrammes per square metre is high for a 1930s primary trainer — a Tiger Moth sits nearer 34 and an Avro 504K near 27 — and that is the number behind the Jungmann's reputation. It is crisper, faster and less floaty than its contemporaries, it wants to be flown onto the ground rather than allowed to settle, and it rewards precision instead of forgiving its absence.
- Power loading
- 6.4 kg/PS (14.1 lb/hp) on 105 PS For comparison the 80 PS Bü 131A carried 8.4 kg per horsepower, which is why the A is remembered as adequate and the B as delightful.
Performance
- Maximum speed, sea level
- 183 km/h (114 mph)
- Cruising speed
- 170 km/h (106 mph) The widely copied English table converts this to 110 mph and 92 knots; 170 km/h is 106 mph and 92 knots, so the knots are right and the miles per hour are not. It is a small error and it is in a great many places.
- Never-exceed speed
- 220 km/h (137 mph) A narrow band between cruise and Vne, and the reason Jungmann aerobatics are flown on energy management rather than on dive speed. There is no great store of kinetic energy in this aeroplane; a vertical line has to be paid for out of what the engine gave you on the way in.
- Landing speed
- 82 km/h (51 mph)
- Climb to 1,000 m
- 5 min 12 s (3,280 ft)
- Climb to 2,000 m
- 12 min (6,560 ft)
- Climb to 3,000 m
- 23 min (9,840 ft)
- Climb to 4,000 m
- 45 min (13,120 ft) Quoted as times to height in the German manner rather than as a rate of climb, and the shape of the sequence is the whole story of a small unsupercharged engine: the first thousand metres take five minutes, the fourth takes twenty-two. The aeroplane is not going anywhere above 3,000 m and was never asked to.
- Initial rate of climb
- 3.2 m/s (630 ft/min), averaged over the first 1,000 m Derived from the time-to-height figure rather than separately measured, and therefore slightly pessimistic against a true sea-level instantaneous rate.
- Service ceiling
- 4,300 m (14,100 ft) Spanish sources give 4,500 m. Either way it is an altitude no primary pupil was ever sent to and it exists only because the certification tables of the period asked for it.
- Range
- 650 km (400 miles) This is the most disputed number attached to the type. Spanish sources give 400 km, which is very nearly half, and the gap is too large to be a conversion error. It is probably the difference between a still-air maximum at economy cruise and a practical planning figure with reserve, but nobody says which is which, and for an aeroplane that spent its life in the circuit the question was academic.
- Endurance
- Roughly 3 h at cruising power Consistent with the higher range figure and the usual published tank size, and consistent with nothing at all in the primary syllabus, where a sortie was twenty to forty minutes and the tank was sized for a morning of circuits rather than a journey.
- Aerobatic envelope
- Cleared for the full aerobatic repertoire of the period: loops, rolls, stall turns, spins in both directions, and inverted flight for limited periods The Jungmann's handling is the reason it outlived its own obsolescence by eighty years. It has honest, heavy-ish ailerons that go where they are put, a rudder with real authority, a stall that is announced and straight, and a spin that is entered deliberately and stopped on standard recovery. What it does not have is self-correction: it will hold whatever attitude and yaw you leave it in, which is precisely what makes it a teaching aeroplane and precisely why a sloppy pilot looks sloppy in it.
- Aerodrome performance
- Grass field, tailwheel, three-point or wheeler landing to taste Take-off and landing runs are not meaningfully quotable for a 670 kg biplane operating off grass into whatever wind there was; the type was flown from small unpaved school fields across Europe, Japan and Spain for thirty years. The relevant number is not distance but visibility: the long inverted-inline nose and the forward cockpit mean a curved taxi and a curved approach are not optional.
Propulsion & systems
- Engine, baseline
- One Hirth HM 504A-2 four-cylinder air-cooled inverted inline, 105 PS (104 hp, 77 kW) at 2,530 rpm on the five-minute rating The graded ratings are worth quoting in full because they describe how the engine was actually used: 105 PS at 2,530 rpm for five minutes, 95 PS at 2,450 rpm for thirty minutes, and 85 PS at 2,360 rpm continuously. A pupil in the circuit spent his life on the middle number.
- Engine detail
- 3.980 L displacement, bore 105 mm, stroke 115 mm, cast magnesium-alloy crankcase; 107 kg dry, 124 kg equipped (236 lb and 273 lb)
- Engine, Bü 131A delta
- One Hirth HM 60R, 3.596 L, bore 102 mm, stroke 110 mm, 80 PS (79 hp, 59 kW) at 2,400 rpm, 72 PS continuous, 66 PS at cruise; 91 kg dry The HM 60 was designed in 1923 and on sale from 1924, and its commercial success is what built Hirth into a position to supply the German rearmament. The Bü 131A is the same aeroplane with a quarter less power and it shows in everything: climb, aerobatic vertical performance, and the margin available on a warm day with two men aboard.
- Why an inverted inline
- Cylinders hung below the crankcase, giving a narrow cowling, a high thrust line and a downward-sloping nose Every serious German trainer of the decade used this layout — Hirth, Argus, Hirth again in the Bü 181 — and it was chosen for exactly one reason: the pilot of a tandem trainer needs to see over the nose on the approach, and an inverted engine lowers the cylinder block out of his line of sight. It also puts the exhaust stubs where the pilot can see the flames at night, which is why the night harassment crews of 1944 liked it rather less.
- Propeller
- Two-blade fixed-pitch wooden airscrew No constant speed unit, no variable pitch, nothing to set wrong. Modern Lycoming conversions frequently fly behind metal or composite props and a few carry constant-speed units, which changes the aeroplane's character more than the extra horsepower does.
- Fuel system
- Single fuselage tank, mounted above the pilots' knee line so that the inverted engine is fed by gravity Published capacities vary between roughly 65 and 80 litres depending on the mark and the source, and the type's inverted-flight limitation follows directly from the plumbing: the Jungmann will fly inverted for a matter of seconds to tens of seconds, not for a sustained inverted pass, and the aeroplane that solved that problem was its single-seat sibling the Bü 133 Jungmeister.
- Oil system
- Separate oil tank in the fuselage, dry-sump inverted engine The one genuine operational nuisance of the type. An inverted air-cooled engine drains oil into the lower cylinders when it stands, and a Hirth or a Tigre that has sat for a week must be pulled through by hand before it is started or it will hydraulic a con-rod. Every Jungmann operator knows this; every Jungmann operator has heard of somebody who forgot.
- Starting, electrics and radio
- Hand-swung propeller; no electrical system, no generator, no radio and no navigation lights as built The night harassment aircraft of 1943–45 and the postwar civil machines both acquired electrical systems locally and by improvisation. A modern airworthy Jungmann almost always has a battery, a starter, a transponder and at least a handheld radio, because it cannot legally operate in European airspace without them.
- Instruments
- Airspeed indicator, altimeter, compass, revolution counter, oil pressure and temperature, slip indicator No artificial horizon, no turn and slip on early machines, no blind-flying panel. Instrument flying was not taught on the Jungmann and could not honestly have been; that came later in the syllabus on the Bü 181 Bestmann and on twins.
- Licence-built powerplants
- ENMA Tigre G-IVA of 125 hp in later Spanish CASA 1.131s; Walter Minor 4-III in the Czechoslovak Aero C-104; Hitachi Ha47 in the Kokusai Ki-86a; Hitachi GK4A Hatsukaze 11 in the Kyūshū K9W1 All four are four-cylinder inverted air-cooled inlines in the same class as the Hirth, which is not a coincidence: the airframe was designed around that architecture and around that engine bay, and each licensee substituted the nearest thing its own industry could build. The Spanish Tigre's extra twenty horsepower is the largest of the differences and the one you can feel.
- Modern re-engining
- Lycoming O-320 of 150 hp (110 kW) and Lycoming O-360 of 180 hp (130 kW) horizontally-opposed fours are common in airworthy aircraft today This is the single largest change to the flying population and it is a real trade. A Lycoming Jungmann starts on a key, runs on avgas, holds its oil where it is put, and climbs like nothing Carl Bücker ever flew. It is also heavier in the nose, blunter in the cowling, noisier, and no longer the aeroplane that the handling reputation was earned in. Purists keep the Hirth or the Tigre and accept the maintenance; most owners do not.
- Airframe life and rebuild
- Steel-tube fuselage, wooden wings, fabric throughout The maintenance profile that follows is why the type survived: the frame is repairable forever, the wings are a known and replaceable wooden component that the Czech and Spanish new-build programmes could simply manufacture again, and the covering is a consumable. Nothing about a Jungmann requires a factory that no longer exists.
10The Bücker Bü 131 Jungmann’s operating costs: what a vintage biplane actually costs to fly
There is no meaningful “unit price” or official cost-per-flight-hour for a Bü 131. It was a 1930s military and club trainer, never sold on a modern open market, and the survivors are one-off restorations whose value depends entirely on condition, engine and provenance. In practice, running one today is the cost of a small vintage aeroplane: a modest-power engine burning ordinary avgas at a low rate, set against the real expense of maintaining a fabric-and-steel-tube airframe — recovering fabric, protecting woodwork, and keeping an ageing engine airworthy — to certified standard. Restored examples change hands for figures typical of desirable vintage biplanes rather than warbird fighters, but any precise number you see should be treated as an estimate. The clearest public price attached to the type is simply the ticket: MiGFlug’s partner GoAviator offers a passenger flight in a genuine open-cockpit Jungmann from Grenchen for roughly 430–790 CHF, depending on duration and whether you choose sightseeing or aerobatics.
Armament & payload
The Bü 131 was designed to carry nothing more dangerous than a pupil, and it spent its last two years of war carrying small bombs over the Eastern Front at night
An armament section for the Jungmann is mostly a section about absence. This is an ab-initio trainer: no gun, no gun mounting, no synchronisation gear, no bomb sight, no armour, no radio, and no provision for any of them in the airframe as designed. For eleven years and several thousand airframes, the payload was two men, about 70 litres of petrol and a bag of oil. The exception came at the end. From 1943 the Luftwaffe was so short of everything that it began flying night harassment sorties with primary trainers, and Bü 131s served with Nachtschlachtgruppen 2, 11 and 12, fitted locally with racks for small bombs and sent out at low level after dark to keep Soviet troops awake. It is a genuine combat use of the type and it deserves recording without inflation: these were 105-horsepower biplanes doing a job that killed their crews at a rate nobody has ever properly counted. The six headings below are therefore repurposed to describe what was actually fitted, carried, aimed and deliberately left off, rather than padded out with six cards saying "none". Night harassment fits were unit-level improvisations rather than factory standards, and the documentation is correspondingly poor. Specific bomb types, rack designs and gun installations attributed to Bü 131s in NSGr service should be treated as plausible rather than established, and vary from account to account.
Guns, and the absence of them
- No production Bü 131 of any mark, in any country, was built with a gun, a gun mounting or provision for either
- No synchronised installation, no flexible mounting, no ring, no over-wing rail — the airframe has no hard structure anywhere that a gun could reasonably be attached to
- Night harassment aircraft are occasionally described as carrying a hand-held machine gun or a machine pistol in the rear cockpit; the accounts are anecdotal and no official fit is documented
- Gunnery was taught elsewhere in the German syllabus, on the Focke-Wulf Fw 44 Stieglitz, the Arado Ar 66 and later on armed advanced types — never on the Jungmann
- The absence is a design statement rather than an oversight. A primary trainer exists to teach a man with four hours in his logbook to take off, turn, stall, spin, recover and land; every kilogramme of armament fitted to it is weight that degrades exactly the qualities being taught. Bücker and Andersson understood the job better than most, and the clean, gunless, low-drag Jungmann is the result.
Bombs and the night harassment fit
- Underfuselage or underwing racks for small bombs, fitted at unit level to aircraft serving with Nachtschlachtgruppen 2, 11 and 12 from about 1943
- The stores were small: anti-personnel and light fragmentation bombs in the 2 kg to 10 kg class, carried in ones and twos, against an all-up weight that had only about 290 kg of useful load to begin with
- Practice bomb carriers were also a routine syllabus fit at flying schools, since elementary bombing exercises formed part of some training courses
- Aiming was by eye, at low level, at night, from an open cockpit; there was no bomb sight of any description
- The Nachtschlacht role is the part of the Jungmann's history most often either ignored or exaggerated. It should be neither. The military value of two ten-kilogramme bombs is negligible; the value of denying an enemy division its sleep for six hours a night, every night, is not, and the Soviets had taught the Germans that lesson with the Polikarpov Po-2 three years earlier. What the Germans lacked, and the Soviets had, was aircrew to spare.
Synchronisation gear, and why a trainer never had it
- None fitted, none designed for, none required — there was never a forward-firing gun to synchronise
- By 1934 German synchronisation was a mature technology; the mechanically and later hydraulically driven gears fitted to the Heinkel He 51 and, from 1936, to the Messerschmitt Bf 109 were in production and worked well
- Fitting one to a primary trainer would have consumed a precision mechanism, added weight ahead of the centre of gravity, and put a live timed gun in front of a pupil on his first solo
- The Jungmann's successor in the advanced role, the Bü 133 Jungmeister, was likewise unarmed; German pilots did not meet a synchronised gun until they reached an armed type
- Worth stating plainly because the omission is informative. A synchronised gun is fitted to an aeroplane somebody expects to fight with. Nobody in 1934 expected the Jungmann to fight, and the fact that it eventually did — unsynchronised, unarmoured, at night, in 1944 — is a measure of how badly the war had gone rather than of what the aeroplane was for.
Payload: two men, petrol and a logbook
- Useful load 290 kg (639 lb) at a 670 kg maximum weight — two adults in flying clothing, a full tank and its oil, and effectively nothing left over
- Both cockpits fully dual-controlled, with stick, rudder pedals, throttle and a duplicated instrument panel front and rear
- Communication between cockpits by speaking tube, in the same manner as every open-cockpit trainer of the period; intercoms are a modern addition
- No baggage compartment worth the name; postwar civil operators fitted small lockers behind the rear seat where the structure allowed
- The load figure is the reason the type does not stretch. Ten kilogrammes of bombs, a radio, an electrical system and a heavier engine cannot all be added to a 290 kg budget, and every modification the Jungmann has ever received — Tigre, Lycoming, transponder, starter, battery — has been paid for out of fuel or out of the second occupant.
Cockpit equipment and what it was for
- Airspeed indicator, altimeter, compass, revolution counter, oil pressure and temperature gauges and a slip indicator, duplicated in both cockpits
- No artificial horizon, no directional gyro, no turn-and-slip on early aircraft, and therefore no honest instrument training on the type
- No electrical system, no generator, no lights and no radio as built; the aircraft was hand-swung and flown by day, in sight of the aerodrome
- Aerobatic instrumentation in the modern sense — g-meter, inverted systems, smoke — is entirely a postwar and largely a civil addition
- The panel is the syllabus made visible. Everything on it concerns keeping the engine alive and the aeroplane the right way up by reference to the horizon; nothing on it lets a pupil fly in cloud. That was deliberate, and the Luftwaffe's later problems with weather attrition among partly trained pilots had nothing to do with the Jungmann and everything to do with how little time they got after it.
What the Jungmann did not carry
- No armour of any kind, anywhere, in any mark — including the night harassment aircraft that were being shot at
- No self-sealing tanks, no fire protection, no parachute provision in the original design, though seat-pack parachutes were used in service
- No flaps, no brakes on the earliest aircraft, no tailwheel steering lock, no trim in the modern adjustable sense on some marks
- No cameras, no target-towing gear and no gunnery equipment as a factory fit; those roles went to purpose-built types
- The list is longer than the list of what was carried, and that is the correct proportion for an ab-initio trainer. The Jungmann's claim on history is that it taught tens of thousands of men to fly accurately, in four countries, across three decades — and that it did so while carrying nothing at all.
Three typical loadouts
- Elementary training sortie, Luftwaffe A/B-Schule, 1938
- Two crew, full fuel of roughly 70 litres, no stores. Twenty-five to forty minutes in the circuit: take-offs, climbing and gliding turns, approaches, three-point landings, and from about the eighth hour the deliberate stall and the deliberate spin. This is what more than nine in ten of all Bü 131 flying hours ever flown actually consisted of.
- Aerobatic instruction sortie, 1939
- Two crew, reduced fuel for weight, no stores, sequence flown between about 600 and 1,500 m. Loops, stall turns, slow rolls, half rolls off the top, spins in both directions, and inverted flight held only for seconds because the gravity fuel system will not sustain it. The Jungmann was the aeroplane on which the German aerobatic tradition of the 1930s was built, and the one on which its pilots learned before moving to the single-seat Jungmeister.
- Night harassment sortie, Nachtschlachtgruppe on the Eastern Front, 1944
- One or two crew, partial fuel, one or two small anti-personnel or fragmentation bombs on locally fitted racks. Take off in darkness from a forward strip, transit at low level, glide the last stretch with the engine throttled back, drop by eye on a road, a bivouac or a light, and go home. No sight, no armour, no radio, no gun, and no realistic prospect of surviving an encounter with anything at all.
Sourcing caveat: the training and syllabus material is well attested; the Nachtschlacht material is not. Wartime records of improvised night harassment units are thin, the aircraft involved included Bü 131s, Ar 66s, Go 145s and captured types in mixed and shifting establishments, and postwar accounts frequently attribute a fit documented for one type to another. Treat every specific bomb designation quoted for a Jungmann anywhere — including in this section — as an informed reconstruction rather than a record.
Variants
Most Jungmanns ever built were not built by Bücker, and most Jungmanns flying today are not German
The variant history of the Bü 131 is unusual in that the parent company is a minority shareholder in its own aeroplane. Bücker Flugzeugbau built perhaps three thousand at Johannisthal and then at the purpose-built Rangsdorf factory it moved into in 1935; everyone else built the rest. Japan alone produced 1,376 across two services. Spain built more than five hundred and kept the line open until the early 1960s. Aero in occupied Prague built roughly three hundred for the Luftwaffe and then another two hundred and sixty for itself after the war. Switzerland built its own fleet and flew it until 1971.
The distinction that matters most to anyone looking at a Jungmann on an airfield today is the one between a German-built aircraft, a licence-built one and a new-build one, and it is routinely blurred. A genuine Rangsdorf-built Bü 131 is a rare object. A CASA 1.131 is not: several hundred were built, the Spanish Air Force flew them until 1968, and when they were sold off in the 1970s they flooded the European and American warbird market and became the aircraft that most people mean when they say "Jungmann". On top of that sit two distinct new-build programmes of the 1990s — one Spanish, using surviving CASA tooling, one Czech — plus a smaller Polish one, whose products are new aeroplanes built to an old drawing and are neither warbirds nor replicas in any straightforward sense.
A further complication: a great many airworthy examples have been re-engined with Lycomings, and a re-engined CASA airframe with a modern propeller, a starter, brakes and a radio has very little of the 1936 aeroplane left in it beyond the geometry and the steel frame. That is not a criticism — it is why the type is still flying in numbers when its contemporaries are in museums — but it should be said out loud rather than papered over.
- Bü 131A (1934–36)
- The original. Hirth HM 60R of 80 PS, first flight 27 April 1934 with Joachim von Koppen at the controls in D-3150. Adequate rather than exciting, and quickly overtaken.
- Bü 131B (1936 onwards, the bulk of all production)
- Hirth HM 504A-2 of 105 PS in place of the HM 60R, with the airframe otherwise substantially unchanged. The twenty-five extra horsepower turned a competent trainer into an aerobatic aeroplane, and this is the mark that every specification table, every licensee and every subsequent legend refers to.
- Bü 131C (one built)
- A single experimental machine with a British Blackburn Cirrus Minor, quoted at 80 or 90 hp depending on the source. It went nowhere and is included only because it is the one variant most lists get half-right.
- Bü 131D, D-1 and D-2 (wartime standard)
- The late production standard, essentially a B with detail equipment changes; the D-2 is the designation under which Aero built for the Luftwaffe. Reference works disagree over whether the D is a genuinely distinct mark or a production and equipment standard of the B, and the disagreement is not resolvable from the surviving paperwork.
- Bü 131B, Dornier-Werke Altenrhein (Switzerland, 1936–38, 78 or 81 aircraft)
- Swiss licence production at Altenrhein on Lake Constance, the works that later became Doflug. The Swiss military fleet carried serials A-1 to A-84, of which the first half-dozen came from Germany. They served the Swiss Air Force as primary trainers until 1971, a service life of thirty-five years, and they are the reason there is a strong Jungmann culture in Switzerland to this day.
- Tatra T.131 (Czechoslovakia, 1937, 11 to 16 aircraft)
- Ringhoffer-Tatra at Kopřivnice, one prototype and ten production aircraft by the best-attested count, sixteen by another. Cut short by the events of 1938 and significant chiefly because the drawings stayed in the country.
- Aero Bü 131D-2, C-4 and C-104 (Czechoslovakia, 1940–49, roughly 300 plus 260)
- Aero in Prague built about 300 for the Luftwaffe under occupation, reaching 24 a month until September 1940. After 1945 it resumed with the Hirth-engined C-4 from April 1946, then switched to the C-104 with the Czechoslovak Walter Minor 4-III, 260 of which were built to 1949. They equipped the Czechoslovak military flying academy and then the Svazarm aero clubs, with the last retired in 1964.
- CASA 1.131 (Spain, 1941–early 1960s, about 530)
- The largest European licence programme and the most consequential one. The first Spanish-built aircraft flew on 14 March 1941; early production used the Hirth HM 504 and later aircraft the 125 hp ENMA Tigre G-IVA, which is the definitive Spanish powerplant. Designated E.3B in Spanish Air Force service and used as the standard elementary trainer until 1968. Totals of 530, 555 and 330-plus-30 all appear in print.
- Kokusai Ki-86a and Ki-86b (Japan, 1,037 built)
- Army Type 4 Primary Trainer, built by Nippon Kokusai with the Hitachi Ha47. The Ki-86b substituted a wooden structure for the steel-tube fuselage to save strategic material, which is the clearest single index of how far Japanese supply had deteriorated by 1944.
- K9W1 Momiji and K9W2 (Japan, 339 built)
- Navy Type 2 Primary Trainer Model 11, designed at the Yokosuka Naval Air Technical Arsenal and built by Kyūshū Hikoki with the Hitachi GK4A Hatsukaze 11. Allied reporting name Cypress. Two Japanese services, two designations, one German aeroplane, and 1,376 airframes between them — more than a quarter of all Jungmanns ever built.
- BP 131 and SSH T-131PA (new-build, 1994 onwards, 21 and 32 respectively)
- Two separate modern programmes producing genuinely new aeroplanes rather than restorations. Bücker Prado in Spain put the type back into production in 1994 using surviving CASA jigs, completing 21 as the BP 131. In the Czech Republic, SSH built the T-131PA to the Czech drawings, with 32 completed by 2022. A third and smaller Polish programme run by Janusz Karasiewicz, also working from Czech design information, is reported to have produced 20 aircraft between 1994 and 2000. A buyer today is far more likely to be offered one of these than a Rangsdorf original.
Survivors, stated precisely, because this is where the type is most often misdescribed. Roughly 200 Bü 131s of all origins survived into the twenty-first century, and a substantial proportion of those are airworthy — an extraordinary figure for a 1934 design and comfortably the highest survival rate of any German aircraft of the period. But the composition of that population is not what the marketing implies. German-built Bücker aircraft are a small minority of it. The large blocks are Spanish CASA 1.131s released onto the civil market after the Ejército del Aire retired them in 1968, Czechoslovak Aero C-104s that passed through the aero clubs, Swiss Dornier-built machines sold off after 1971, and the 70-odd new-build Spanish, Czech and Polish aircraft completed since 1994. Many carry Lycoming O-320 or O-360 engines rather than a Hirth or a Tigre, and a good number wear German wartime markings they have no historical claim to. None of that makes them lesser aeroplanes; it makes them different ones, and an aircraft advertised as a "Bücker Jungmann" should always be asked where and when it was built and what is under the cowling.
Bücker Bü 131 Jungmann: ninety years in the air
Bücker comes home
Carl Clemens Bücker, back from running the Svenska Aero works in Sweden, founds Bücker Flugzeugbau near Berlin and brings Swedish designer Anders Andersson with him.
First flight
The prototype Bü 131 Jungmann flies on 27 April — a light, fully aerobatic two-seat biplane trainer powered by an inverted Hirth engine.
Luftwaffe standard trainer
The improved Bü 131B with the 105-hp Hirth HM 504 enters mass service as the primary trainer of the expanding Luftwaffe and Germany’s civil flying schools.
The Jungmeister is born
Andersson shrinks the design into the single-seat Bü 133 Jungmeister, which quickly becomes one of the outstanding aerobatic aircraft of the decade.
Switzerland builds its own
Licence assembly begins at Dornier/Doflug in Altenrhein; the Swiss Air Force adopts the Jungmann as its primary trainer, with “A-” military registrations.
Exported and copied worldwide
The type is licence-built in Spain (CASA 1.131), Japan (Ki-86 / K9W Momiji), Hungary, Czechoslovakia and Yugoslavia — thousands are produced across all lines.
Wartime service
The Jungmann remains overwhelmingly a primary trainer, with individual aircraft used for liaison, glider-towing and light observation. GoAviator’s A-66 is built at Altenrhein in 1939.
Spain keeps the line alive
CASA continues building the Jungmann as the CASA 1.131 into the 1960s, many re-engined — the reason so many survivors today are Spanish-built airframes.
End of Swiss service
Switzerland retires its military Jungmanns after 35 years of continuous use; many pass directly into private and warbird ownership.
Still flying — and bookable
Hundreds remain airworthy worldwide as beloved vintage aerobatic biplanes. MiGFlug’s partner GoAviator offers open-cockpit Jungmann flights from Grenchen, Switzerland.
From the cockpit: twelve Jungmann stories
From Sweden, with a Swede
Carl Bücker learned aircraft-building in Sweden and brought designer Anders Andersson home with him.
Read the full story
The prototype takes off
The first Jungmann flew on 27 April 1934 and impressed everyone who touched the controls.
Read the full story
“Young man” and “young master”
Jungmann means “young man”; the single-seat Jungmeister is the “young master.”
Read the full story
Where German pilots began
Through the late 1930s the Jungmann was the first aircraft most German pilots ever flew.
Read the full story
The Jungmann that never stopped
Spain built the type as the CASA 1.131 into the 1960s — so most survivors are Spanish.
Read the full story
A Bücker in the Far East
Japan licence-built the Jungmann as the Army Ki-86 and the Navy K9W Momiji.
Read the full story
Thirty-five years of Swiss service
The Swiss Air Force flew Doflug-built Jungmanns from 1936 until 1971.
Read the full story
The champion sibling
The single-seat Bü 133 Jungmeister became a 1930s world-aerobatic star.
Read the full story
Why the engine hangs upside-down
The inverted inline kept the cylinders low so the student could see over the nose.
Read the full story
The biplane pilots fall in love with
Ask anyone who has flown one: the Jungmann’s controls are close to perfect.
Read the full story
You can still fly one
MiGFlug’s partner GoAviator offers open-cockpit Jungmann flights from Grenchen.
Read the full story
Hundreds still airworthy
Ninety years on, the Jungmann remains a cornerstone of the vintage-aircraft world.
Read the full story
The Bücker Jungmann in pictures
The Bücker Jungmann in motion
Flying with the Bücker 131 “Jungmann” — Pre-WW2 Trainer (channel: phil style). A pilot’s-eye flight in a restored open-cockpit Jungmann — the same slow, sensory experience GoAviator offers passengers from Grenchen.
Where the Bücker Jungmann flew
A trainer’s record: counted in pilots, not kills
The Jungmann was never a warplane, so it has no tally of air-to-air victories to define it. Its record is written instead in the one thing a trainer actually exists to produce: pilots. For the better part of four decades it turned nervous beginners into aviators, first across Germany and then, through its many licence versions, across a dozen air forces from Spain to Japan to Switzerland. Measured by how many people first learned to fly on it, few aircraft in history have a stronger claim to importance.
Its second, quieter record is one of endurance. Where most trainers are scrapped the moment a newer type arrives, the Jungmann kept going — in Spanish CASA production into the 1960s, in Swiss military service until 1971, and then in private and warbird hands ever since. Ninety years after the prototype first flew, hundreds are still airworthy and still doing loops and rolls at airshows and fly-ins around the world. That combination of huge original numbers and genuine affection is exactly why so many survived.
As a documentary type it wore the plain training markings of its era, including wartime German schemes on 1930s and 1940s airframes; this page treats those markings neutrally and historically rather than sanitising or dramatising them. The Jungmann’s legacy is not conquest but continuity — a link, unbroken, back to the very beginnings of powered flight training.
Explore more trainers, biplanes and warbirds in the MiGFlug Aircraft Museum.
Everything people ask about the Bücker Bü 131 Jungmann
Can I fly in a Bücker Bü 131 Jungmann?
What is the difference between the Bü 131 Jungmann and the Bü 133 Jungmeister?
When did the Bücker Jungmann first fly, and who designed it?
How many Bücker Jungmanns were built?
What engine does the Bücker Bü 131 Jungmann use?
What are the Jungmann’s licence-built versions?
Which exact aircraft does GoAviator fly at Grenchen?
Is the Bücker Jungmann still flying today?
Was the Bücker Jungmann ever used in combat?
Where can I see a Bücker Jungmann?
Is the Bücker Jungmann difficult to fly?
What does an open-cockpit Bücker Jungmann flight include?
Why is the Bücker Jungmann so popular with warbird pilots?
You CAN fly the Bücker Jungmann
Almost every aircraft in this encyclopedia is one you can only read about. The Jungmann is different. MiGFlug’s partner GoAviator flies a genuine 1939 open-cockpit Bücker Jungmann from Grenchen, Switzerland — you sit up front in leather cap and goggles and choose sightseeing, aerobatics, or both. Roughly 430–790 CHF depending on duration.
Book the Grenchen biplane flightContinue the tour
Every fact, checked
- Smithsonian National Air and Space MuseumReference for the Bücker family of trainers and the Bü 133 Jungmeister aerobatic derivative held in the national collection.
- History of War — Bücker Bü 131 JungmannDevelopment history, the A and B variants, licence production and wartime service background.
- flugzeuginfo.net — Bü 131 technical dataDimensions, weights, engine and performance figures used for the Bü 131B specification table.
- Aviation History of SwitzerlandSwiss Doflug/Dornier licence production at Altenrhein and Swiss Air Force service from 1936 to 1971, including the “A-” registrations.
- The Aviation Geek ClubVintage-warbird coverage of the Jungmann, its handling reputation and its many licence variants.
- Warbird AlleyBackground on surviving Bücker Jungmann and CASA 1.131 warbirds and their place in the vintage-aircraft world.
- Historic & Classic Aircraft SalesMarket notes, restoration detail and history for surviving Bü 131 and CASA 1.131 airframes.
- Wikimedia CommonsImage source for the photographs used on this page; each individual credit and licence is shown in the gallery captions above.