Junkers A50 Junior
| Industry | Aerospace |
|---|---|
| Founded | 1916 |
| Founder | Hugo Junkers |
| Headquarters | Germany |
| Products | Aircraft, including Junkers A50 sports aircraft |
| Website | www |
The Junkers A50 "Junior" represents a German-engineered all-metal sports aircraft crafted by the manufacturer Junkers. Conceived by Hermann Pohlmann in the late 1920s, it utilized a corrugated duralumin structure combined with a sleek fuselage and a low-mounted cantilever wing design. This model was adaptable, offering configurations for traditional landing gear, skis, or floats, which allowed operation across a wide range of climates—from tropical zones to near-arctic regions. While predominantly equipped with a single Armstrong Siddeley Genet II engine, alternative powerplants were also employed.
Its inaugural flight took place on 13 February 1929. A floatplane variant achieved eight FAI world records related to altitude, distance, and velocity in 1930. Significantly, in 1931, aviator Marga von Etzdorf completed a solo journey from Berlin to Tokyo, becoming the first woman to accomplish this feat.
Development
The Junkers A50 marked Hermann Pohlmann’s initial venture into sports aircraft design at Junkers, applying the same advanced all-metal corrugated duralumin construction characteristic of larger Junkers airliners. After its first flight in February 1929, four more prototypes tested different engines.
Although Junkers initially aimed to manufacture 5,000 units, production ceased after only 69 original aircraft were built, with merely 50 sold—likely due to pricing constraints limiting broader market appeal. Beyond Germany, the A50 found operators overseas and was occasionally used by airlines. In the United Kingdom during 1930, its price ranged from £840 to £885. Starting with the A50ce model, wings could be folded to facilitate transportation.
Three German A50s entered the 1929 Challenge touring aircraft competition, finishing in 11th and 17th positions; another three competed in the 1930 event securing 15th, 27th, and 29th places. The floatplane version powered by the Armstrong Siddeley Genet II notably established multiple FAI records in June 1930. The design’s operational flexibility and robust construction highlighted Junkers’ commitment to innovative sports aviation during this period.
Design
The Junkers A50 was a sports aircraft featuring conventional styling with an all-metal build, low-mounted cantilever wing, and stressed corrugated duralumin skin.[1][2] It was promoted for its adaptability across seasons and terrains—capable of summer or winter operation on land or water in environments ranging from tropical heat to near-arctic cold.[3] The pilot occupied the rear cockpit while the passenger sat forward; both stations were equipped with dual controls and comprehensive instrumentation.[4]
Its fuselage consisted of a streamlined corrugated duralumin tube engineered to comply with typical weight restrictions of mixed-material aircraft despite extensive metal use.[5] Structural support came from formers and bulkheads with accessible panels for maintenance and inspections.[6] The engine was housed at the front nose section; the rear tapered upward into a vertical fin.[5]
Designed primarily as a touring plane, occupant comfort was emphasized. The two cockpit seats were spacious and well-padded with adjustable backrests and armrests. Two luggage compartments accommodated heavy baggage: one located between the seats accessible during flight and another behind the pilot large enough for sizable trunks. Cockpit tubing was concealed beneath a double-layered fuselage floor.[7]
The wing comprised an integral center section with two removable outer panels attached by only four screws each for easy transport and maintenance. Like the fuselage, it featured stressed corrugated duralumin covering and a simple structural design without ribs to streamline production and upkeep.[2] Owners could remedy minor surface imperfections such as bulges themselves. Certain models incorporated wings folding rearwards for compact storage.[1][2]
The elevator consisted of two parts hinged to the stabilizer and was adjustable on the ground.[6] The rudder was hinged both to the fin and fuselage tail tip. Ball bearings were used in elevator, rudder, and aileron controls to facilitate smooth handling and reduce maintenance demands.[6] Large control surfaces required minimal deflection; control harmony was achieved through adjustable push rods. The aircraft was regarded as easy to operate and suitable for novice pilot instruction.[6]
Landing gear options included conventional wheels, skis, or floats without need for special fittings.[8] Floats were sufficiently large to support buoyancy individually and contained watertight compartments. All undercarriage variants mounted beneath the wing’s center section.[8] The wide-track landing gear minimized ground handling problems caused by crosswinds but lacked a continuous axle which limited rough-field mobility. Steering relied on rudder input to compensate for this limitation. Wheels were large and rugged for unimproved airstrips and equipped with durable rubber-cord shock absorbers designed for longevity.[9]
Power typically came from a single Armstrong Siddeley Genet II air-cooled radial engine, installed on a removable frame that also served as a firewall.[3] This engine provided dependable reserve power. It was enclosed in smooth duralumin panels leaving cylinder heads exposed. The propeller was directly driven by the engine shaft. Starting involved injecting atomized fuel into the intake manifold combined with ignition from a lightweight magneto.[10] Fuel tanks were positioned within the center wing section, feeding via pump to a gravity tank adjacent to the oil reservoir.[11]
New production
Starting in 2022, Junkers Aircraft Works resumed manufacturing with the launch of the updated A50 model known as the A50 Junior. This version incorporates contemporary avionics, is equipped with a Rotax 912iS engine paired with a composite MT-Propeller, and includes a ballistic parachute system. By May 2023, 27 units had been sold across Europe, and there are intentions for WACO Aircraft Corporation to handle production for the United States market.
At the 2024 Sun 'n Fun Aerospace Expo, Junkers unveiled the A50 Heritage, designed to offer a more faithful representation of the original A50. This model is powered by a Verner Scarlett 7U radial engine and features a two-piece glass windscreen along with analog instrumentation.
Original production
- A50 – Powered by an Armstrong Siddeley Genet radial engine
- A50ba – Equipped with a Walter Vega radial engine (only one unit built)
- A50be – Fitted with Armstrong Siddeley Genet engine
- A50ce – Utilizes Armstrong Siddeley Genet II or export Genet Major I 74 kW engines, and has folding wings
- A50ci – Features a Siemens-Halske Sh 13 radial engine and folding wings; initially planned as a "Volksflugzeug"
- A50fe – Powered by Armstrong Siddeley Genet II, with a modified airframe and folding wings
- KXJ1 – A single A-50 unit delivered to the Imperial Japanese Navy Air Service for testing
The -ce and -ci models were produced in the highest quantities, each numbering around 25 on the German civil registry. Thanks to their robust build quality, numerous A50s remained operational into the 1960s in Finland. Preserved aircraft can be found at the Deutsches Museum in Munich and at Helsinki airport; one example (VH-UCC, c/n 3517) is still flying in Australia.
New production
- A50 Junior – A modernized iteration of the A50 powered by a Rotax 912iS engine.
- A50 Heritage – A variant featuring a Verner Scarlett 7U engine, two-piece windscreen, and analog cockpit instruments.
Operators
- Bolivian Air Force – Operated three A50s transferred from Lloyd Aéreo Boliviano during the Chaco War
- Lloyd Aéreo Boliviano – Utilized three A50s primarily for training and light transport duties
- South African Air Force
- South African Airways operated three aircraft
Surviving aircraft
One preserved example, registered OH-ABB, is exhibited at Helsinki Airport; it was piloted by Väinö Bremer on a notable flight to Cape Town.
See also
Bibliography
- Andersson, Lennart. "Chinese 'Junks': Junkers Aircraft Exports to China 1925-1940". Air Enthusiast, No. 55, Autumn 1994, pp. 2–7.
- Tincopa, Amaru; Rivas, Santiago. Axis Aircraft in Latin America. 2016. Manchester, UK: Crécy Publishing. ISBN 978-1-90210-949-7.
- "The 'Junkers-Junior' Light Airplane (German): A Two-Seat All-Metal Low-Wing Cantilever Monoplane". National Advisory Committee for Aeronautics, 1 June 1930. NACA-AC-118, 93R19686.
External links
- ↑ 1.0 1.1 Cite error: Invalid
<ref>tag; no text was provided for refs namedkrzyzan - ↑ 2.0 2.1 2.2 Cite error: Invalid
<ref>tag; no text was provided for refs namednaca 1 - ↑ 3.0 3.1 Cite error: Invalid
<ref>tag; no text was provided for refs namednaca 5 - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namednaca 34 - ↑ 5.0 5.1 Cite error: Invalid
<ref>tag; no text was provided for refs namednaca 1,2 - ↑ 6.0 6.1 6.2 6.3 Cite error: Invalid
<ref>tag; no text was provided for refs namednaca 3 - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namednaca 2 - ↑ 8.0 8.1 Cite error: Invalid
<ref>tag; no text was provided for refs namednaca 45 - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namednaca 4 - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namednaca 56 - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namednaca 6