View source for Junkers F 13

{{Short description|Type of airplane}}
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{{Infobox aircraft
  |name = F 13
  |image = Replica Junkers F13 ‘HB-RIM’ (49789577598).jpg
  |caption = Junkers F 13 over the Aérodrome de Cerny-La-Ferté-Alais
  |type =passenger transport 
  |manufacturer = [[Junkers]]
  |designer = Otto Reuter
  |first_flight = 25 June 1919<ref name="Wagner">Wagner 1996, {{page needed|date=May 2024}}.</ref>
  |introduction = 1920
  |retired = late 1930s (1951 in Brazil)
  |status =
  |primary_user = [[Junkers Luftverkehr]] 
  |more_users = [[Deutsche Luft Hansa|DLH]] <br/> [[Lloyd Aéreo Boliviano|LAB]] <br/> [[LOT Polish Airlines|LOT]] <br/> [[Österreichische Luftverkehrs AG|ÖLAG]] <br/> [[SCADTA]]<br/> [[Varig]]
  |produced = 1919–1932/2009-2019
  |number_built = 322
  |unit cost = 
  |variants = 
}}

The '''Junkers F 13''' is the world's first all-metal transport aircraft, designed and produced by the [[Weimar Republic|German]] aircraft manufacturer [[Junkers]].

Produced shortly after the end of the [[First World War]], it was a [[Cantilever#Aircraft|cantilever]]-wing [[monoplane]] with enclosed accommodation for four passengers and a two seat open cockpit. Like all Junkers duralumin-structured designs, from the 1918 [[Junkers J 7|J 7]] to the 1932 [[Junkers Ju 46|Ju 46]], (some 35 models), it has an [[aluminium]] alloy ([[duralumin]]) structure entirely covered with Junkers' characteristic corrugated and [[Stressed skin|stressed]] duralumin skin. Internally, the wing was built up on nine circular cross-section duralumin [[Spar (aviation)|spar]]s with transverse bracing. All control surfaces were [[Flight control surfaces#Control horn|horn balanced]].

A total of 322 aircraft were manufactured, a considerably large number for a commercial airliner of the era, and were operated all over the world. It accounted for over a third of air traffic in the early 1920s. It remained in production for thirteen years and in commercial service for more than thirty. There were many versions including floatplanes for water landing, skis, mailplane, and different engines. Several survive in various states of repair in museums, and a replica of the type was put back in production in the 2010s, taking flight once again nearly a century after the type first flew.

==Development==
[[File:1920 JunkersF13 Cockpit.jpg|thumb|left|F 13 cockpit]]
[[File:Musée de l'air - Junkers F.13.jpg|thumb|The Junkers F 13 viewed from above at the [[Musée de l’air et de l’espace]]]]
[[File:Junkers-f13.jpg|thumb|Deutsches Museum's F 13]]
What would become the F 13 originated in the work of Professor [[Hugo Junkers]] and his Research Institute in [[Dessau]], Germany throughout the 1910s. These efforts were responsible for producing multiple new ideas pertaining not only to [[aerodynamics]] but also the employment and working of lightweight metal construction in aviation.<ref name = "naca 1"/>

The F 13<ref>{{Harvnb|Turner|Nowarra|1971|pp=17–18}}</ref> was a very advanced aircraft when built, an aerodynamically clean all-metal low-wing cantilever  monoplane. It was the world's first all-metal passenger aircraft and Junkers' first commercial aircraft. The designation letter F stood for ''Flugzeug'' (aircraft); it was the first Junkers aeroplane to use this system. Earlier Junkers notation labelled it J 13. Russian-built aircraft used the designation Ju 13.{{Citation needed|date=May 2024}}

The F 13 first flew on 25 June 1919,<ref>{{cite web |last1=Swopes |first1=Bryan R |title=25 June 1919 |url=http://www.thisdayinaviation.com/25-june-1919/ |publisher=This Day in Aviation |access-date=26 June 2014}}</ref> powered by a 127&nbsp;kW (170&nbsp;hp) [[Mercedes D.III]]a inline upright water-cooled engine. The first production machines had a wing of greater span and area and was furnished with the more powerful 140&nbsp;kW (185&nbsp;hp) BMW IIIa upright inline water-cooled motor.

Many variants<ref>{{Harvnb|Turner|Nowarra|1971|p=19}}</ref> were built using Mercedes, BMW, Junkers, and [[Armstrong Siddeley]] [[Siddeley Puma|Puma]] liquid-cooled [[inline engine (aviation)|inline engines]], and [[Bristol Jupiter|Gnome-Rhône Jupiter]] and [[Pratt & Whitney R-1690|Pratt & Whitney Hornet]] air-cooled [[radial engine]]s. The variants were mostly distinguished by a two letter code, the first letter signifying the [[airframe]] and the second the engine. Junkers L5-engined variants all had the second letter -e, so type -fe was the long fuselage -f airframe with a L5 engine.

The F13 was the basis for developing the [[Junkers W 33]] and [[Junkers W 34]].<ref name=":1">{{Cite web |title=Canadian Junkers to Berlin Museum |url=https://www.key.aero/article/canadian-junkers-berlin-museum |access-date=21 December 2023 |website=www.key.aero |language=en}}</ref>

==Design==
The Junkers F 13 was an all-metal transport aircraft; its construction and several of its design features, such as its [[cantilever]] wing, were particularly noteworthy for the era. Unlike traditional wings of the era, which had to use external [[strut]]s and guywires out of necessity, the wing of the F 13 lacked any stay-wires; their elimination meant that a major source of [[Drag_(physics)#Aerodynamics|drag]] was entirely avoided.<ref name = "naca 1"/> Instead of exposing the supporting elements to the external air currents, all of the bracing was located within the wing itself, thus providing a neater solution from an aerodynamic perspective. As a consequence of this arrangement, the profile of the wing had to be considerable thicker to accommodate these supporting members; while orthodox attitudes of the era favoured thin profiles, the aerodynamic qualities of the F 13 was quite favourable, largely as a result of diligent experimentation.<ref name = "naca 1">NACA 1926, p. 1.</ref> Another advantage was that, while the polar curve for thin profile wings typically had a relatively restricted range of application, such as for high-speed flight or a rapid rate of climb, of a higher climb, the polar curve of thicker profile wings could perform more adequately across both circumstances.<ref name = "naca 12">NACA 1926, pp. 1-2.</ref>

In terms of its material composition, the F 13 had intentionally discarded traditional materials, such as wood and [[fabric]], in favour of an all-metal approach that had been pioneered by Junkers.<ref name = "naca 2">NACA 1926, p. 2.</ref> This switch eliminated concerns over the variable quality of available wood, and the procurement difficulties in obtaining high quality wood that would be well-suited for aeronautical purposes. It also dispensed with various other concerns, as it was perceived as more difficult to maintain the calibrated dimensions of wood due to [[Wood warping|warping]], the same factor also hindered interchangeability; metal posed less of a fire hazard as well.<ref name = "naca 23">NACA 1926, pp. 2-3.</ref> Unlike Junker's early metal aircraft, which was composed of [[steel]] and thus quite heavy, the F 13 was made of [[duralumin]], a light-weight [[alloy]] that would find widespread use in aeronautical circles. This metal has greater uniform strength to the aircraft, which made it easier to design; greater ease of calculation increased the economics of this choice as well.<ref name = "naca 3">NACA 1926, p. 3.</ref>

Somewhat offsetting the difficulties of developing a new arrangement to permit the installation of all supporting framework internally, the use of metal enabled a substantial number of new construction features to be adopted.<ref name = "naca 4">NACA 1926, p. 4.</ref> Although the specific gravity of duralumin is greater than that of wood, the weight of the Junkers F 13 was beneath that of all other airplanes, wood or metal, of the same class, as a result of thorough aerodynamic studies conducted by the company.<ref name = "naca 45">NACA 1926, pp. 4-5.</ref> Furthermore, it was also felt that the metal approach would increase structural safety and serviceability.<ref name = "naca 34">NACA 1926, pp. 3-4.</ref> In comparison to its wooden contemporaries, the F 13's all-metal approach was slower to [[fatigue]]; it was also less expensive to protect against [[humidity]] and most other atmospheric conditions. [[Termite]]s were unable to damage metal aircraft.<ref name = "naca 4"/> It was partially for this reason that use of the F 13 in various [[tropical]] countries, particularly those in [[South America]], quickly became commonplace. In general, the life of a metal aircraft was believed to be far greater than that of a wooden one.<ref name = "naca 4"/>

The supporting surface, which was the basis of the structure, comprises three parts, in order to facilitate transportation.<ref name = "naca 7"/> The outer portions of the wings were secured to the framework of the central wing section, whose spars consisted of nine duralumin tubes, in a manner that assured symmetry of the wings. These wings could be mounted and demounted by two men within a few minutes. A cantilever girder comprised the core of the wing's framework.<ref name = "naca 7"/> The external metal covering, which was [[Corrugated galvanised iron|corrugated]] for increased strength, helped to withstand the stress of [[Torsion (mechanics)|torsion]] while the overall structure was fairly resistant to dynamic overloading. In another departure from conventional practices of the time, the fuselage was placed on the wing; this permitted the framework of the wing's central section to form the base of both the fuselage and the cabin.<ref name = "naca 7"/> Accordingly, the aircraft had a relatively strong superstructure while also reducing its weight. One advantage of the position of the wing was that it afforded the best possible protection to the cabin and its occupants, in the event of a rough or emergency landing.<ref name = "naca 7">NACA 1926, p. 7.</ref>

The flight controls were fairly conventional, both the [[Elevator (aeronautics)|elevator]] and [[aileron]]s were actuated by the pilot via a column with a wheel while the [[rudder]] was operated using pedals.<ref name = "naca 78">NACA 1926, pp. 7-8.</ref> Various sliding doors were present for inspection and serviceability purposes for the various control cables, levers, and tubes. Provision was made for the installation of dual flight controls, a feature that was thought to be of particular importance during long-range flights.<ref name = "naca 8"/> All of the tail surfaces had fairly large areas that benefitted not only the aircraft's manoeuvrability but also its steadiness in flight. Another departure from convention was the means of adjusting the stabilizer to compensate for weight variations; a [[Trim tab|trimming tank]] positioned near the rear of the fuselage could offset nose-heaviness or tail-heaviness by means of a pump controlled by the pilot that would withdraw or add sufficient fuel to achieve equilibrium.<ref name = "naca 8">NACA 1926, p. 8.</ref>

The [[landing gear|undercarriage]] was largely composed of steel tubing; a total of four [[streamliner|streamlined]] supports functioned as spring struts.<ref name = "naca 8"/> A V-shaped strut arrangement assured sufficient rigidity while the distance between the wheels was thought to be sufficient to prevent the aircraft turning over even during an oblique landing. The tail skid was both jointed and [[shock absorber|shock-absorbing]]; it could be readily replaced and was sizable enough to protect the fuselage from sustaining serious damage. Furthermore, special connections were present for the installation of [[Float (nautical)|floats]], which could be rapidly substituted for the wheels, to convert the F 13 into a [[floatplane]].<ref name = "naca 9"/> These floats, which were made of duralumin, were each internally divided into six tight compartments. The aircraft could be similarly equipped for taking off or landing upon snow or ice via the removal of the wheels and substituting them for duralumin runners while a shoe would be attached to the tail skid.<ref name = "naca 9">NACA 1926, p. 9.</ref>

The aerodynamic efficiency of the F 13 meant that less engine power than had been anticipated could be used; various engines from a variety of suppliers could be installed.<ref name = "naca 910">NACA 1926, pp. 9-10.</ref> Easy access to all points of the engine was possible while various components could be exchanged within a short timeframe. The frontal [[Radiator (engine cooling)|radiator]] was specially designed by Junkers to possess a high level of efficiency as well as being relatively lightweight; the pilot was able to regulate the engine temperature via the adjustable shutters.<ref name = "naca 10">NACA 1926, p. 10.</ref> Those aircraft intended for use in a tropical country were typically provided with an additional radiator. Considerable attention was paid to the development of propellers, which was shaped by extensive research into aspects such as the pitch, blade section and diameter. The initial propellers used were composed of [[lamination|laminated]] wood that was protected by metal along their [[leading edge]]s and achieved a mechanical efficiency at least equal to that of wooden ones.<ref name = "naca 1011">NACA 1926, p. 10-11.</ref> Junkers also worked on metal propellers of its own make, the hollow sections of which diminishes in line with the laws of bodies of uniform resistance. Advantages presented by metal propellers include the ability to replace a single blade (instead of the whole propeller), a lack of sensitivity to climate influences, and the potential to shape the propeller hub to vary the propeller pitch for either speed or climb.<ref name = "naca 1011">NACA 1926, p. 10-11.</ref>

Behind the single engine was a semi-enclosed [[cockpit]] for the crew, roofed but without side glazing. There was an enclosed and heated cabin completed with both with windows and doors. Passenger seats were fitted with [[Seat belt#Airplanes|seat belts]], unusual for the time. The F 13 has a fixed conventional split [[landing gear]] with a rear skid, though some variants were fitted with floats or on skis. The cabin was relatively sizable and elegantly furnished for the era; in addition to the four passengers it accommodated,  room for another passenger or crew member was present alongside the pilot.<ref name = "naca 5">NACA 1926, p. 5.</ref>

==Operational history==
[[File:Bundesarchiv Bild 102-00007, Berlin, Start eines Junkers-Flugzeuges.jpg|thumb|right| F 13 fy ''D-190'' of Lloyd Ostflug then Junkers Luftverkehrs AG.]]
[[File:1919-10-10 JunkersF13 Kabine.jpg|thumb|The F13 cabin for passengers]]

Any manufacturer of civil aircraft immediately after [[World War I]] was faced with competition from the very large numbers of surplus warplanes that might be cheaply converted – for example, the [[Airco DH.9|DH.9C]]. German manufacturers had further problems with the restrictions imposed by the Inter-Allied Aeronautical Commission of Control, which banned the production of warplanes and of any aircraft in the period of 1921-22. Junkers<ref>{{Harvnb|Turner|Nowarra|1971|pp=18–20}}</ref> picked up orders abroad in 1919 in Austria, Poland and the USA and, in the following years with [[SCADTA]] (Colombia) and the [[United States Post Office Department]]. John Larsen Aircraft in the USA purchased a production licence, their machines being designated JL-6. In 1922 there were sales in England, France Italy and Japan.

The F13 was a very popular civilian aircraft, carrying it is estimated 40% of the world's air traffic in the early 1920s.<ref name=":1" />

In Bolivia, [[Lloyd Aéreo Boliviano|LAB's]] first airplane was a Junkers F 13; first flight took off from [[Cochabamba]] on September 23, 1925.

Junkers set up its own airline – [[Junkers Luftverkehr|Junkers Luftverkehr AG]] in 1921  to encourage the acquisition of the F 13 by German airlines and was flying 60 of them by 1923. It also established a branch of the airline in Iran. Other marketing techniques were used, providing F 13s on cheap leases and free loans, with such effect that some 16 operators across Europe were flying them. When Junkers Luftverkehr merged into [[Deutsche Luft Hansa|Luft Hansa]] in 1926, 9.5 million miles had been flown by them. ''Luft Hansa'' itself bought 55 aircraft and in 1928 waa using them on 43 domestic routes. Even in 1937, its F 13s were flying over 50 flights per week on four routes. They were finally withdrawn in 1938.

Most of the F 13s produced before production ended in 1932 were built at Junkers German base at [[Dessau]]. During the difficult 1921–23 period production was transferred to Junkers plants at [[Gdańsk|Danzig]] and [[Tallinn|Reval]]. In 1922–23, [[Hugo Junkers]] signed a contract with the [[Soviet Union]] to produce the aircraft in a Soviet factory at [[Fili (Moscow)|Fili]] near Moscow, which became known as "Plant no. 22". Some of these aircraft served Soviet airlines while others were used by the [[Red Army]].

There were some other military users. The [[Colombian Air Force]] used the F 13 (and the related W.33, W.34 and K.43) as bombers{{Citation needed|reason= the "as bombers" needs ref|date=December 2009}} in the [[Leticia Incident|Colombia–Peru War]] in 1932–23. The [[Republic of China (1912–1949)|Republic of China]] flew F 13s converted into [[Scout plane|scout]] [[bomber]]s until the [[January 28 Incident]] in 1932, when they were destroyed by the [[Japan]]ese along with the Shanghai Aircraft Factory. The Turkish Flying Forces flew a few.

A feature that made the F 13 popular internationally was the ease with which its landing gear could be converted to [[pontoon (boat)|floats]]. During the formative years of commercial aviation, bodies of water such as rivers, lakes, seas and oceans were more abundant than landing strips and civil airports in many parts of the world, so [[seaplanes]] were commonplace and even, in some places, more useful than regular aircraft. Aside from the obvious addition of floats, little modification was needed for this conversion; however, the different configuration could cause issues with directional control,{{fact|date=August 2024|reason=more likely to be directional stability than control}} and so some models had their [[rudder]] extended to compensate for this.

From their introduction in 1919 F 13s were in service for more than thirty years; the last commercial F 13 was retired in [[Brazil]] in 1951.

==Back in production 2009-2019==
[[File:EBACE 2019, Le Grand-Saconnex (EB190541).jpg|thumb|left|Replica F 13 nose, 2019]]
[[File:Replica Junkers F13 ‘HB-RIM’ (49790040611).jpg|thumb|One of the new Junkers F 13 replicas]]
A German-Swiss project to build a reconstruction of the F 13 was launched in 2009; the first flight was in September 2016. The reconstruction is equipped with radio and a transponder, and uses a 1930s [[Pratt & Whitney R-985 Wasp Junior]] engine, but is otherwise as close as possible to the original. Additional reconstructions are to be sold for $2.5 million each.<ref>{{cite news|title=Junkers F13 Makes a Triumphant Return to the Skies|url=http://www.flyingmag.com/junkers-f13-makes-triumphant-return-to-skies|access-date=25 September 2016|work=Flying Magazine|issue=20 September 2016}}</ref>

Junkers Flugzeugwerke (SD303) has resurrected the Junkers F 13 as an all-new airplane to honor Hugo Junkers’ achievements. The company completed the aircraft in 2016 and it is at EBACE commemorating the type's maiden flight 100 years ago. The model is available for purchase, and three others like it are currently under construction. Work was in progress on the second and third aircraft during 2019, with airframe number two's maiden flight planned for early that summer.<ref>{{cite web |url = https://www.ainonline.com/aviation-news/business-aviation/2019-05-23/centenary-celebrations-commercial-aviation-classic |title = Centenary Celebrations for a Commercial Aviation Classic |publisher = AIN Online |first =  Amy |last = Laboda |date = 23 May 2019}}</ref>

The replica F 13 made its maiden flight on 15 September 2016, the culmination of many of years of work on the part of supporters of the project. .<ref name=":0">{{Cite web |title=Official Maiden Flight of Rimowa Replica Junkers F13 |url=https://www.eaa.org/eaa/news-and-publications/eaa-news-and-aviation-news/news/09-22-2016-official-maiden-flight-of-rimowa-replica-junkers-f13 |access-date=2023-12-21 |website=www.eaa.org |language=en}}</ref> The replica was created from original blueprints and also a laser scan of the type at the Museum of Air and Space at Le Bourget, Paris. The replica has 2600 parts and tens of thousands of rivets and is powered by a Wasp radial engine.<ref name=":0" />

==Variants==
[[File:Junkers-Larsen JL-6 on floats at NAS Anacostia in 1920.jpeg|thumb|Junkers-Larsen JL-6 as a floatplane, 1920]]
[[File:FVMF.003785.jpg|thumb|F 13 with a radial engine and skis, 1940]]
;F 13: first prototype, smaller wings (span 14.47&nbsp;m/47&nbsp;ft 5.75&nbsp;in, area 38.9&nbsp;m<sup>2</sup> /419&nbsp;ft²) and less powerful engine 127&nbsp;kW (170&nbsp;hp) [[Mercedes D.III|Mercedes D IIIa]] inline than production models.
;F 13a: first production aircraft with 140&nbsp;kW (185&nbsp;hp) [[BMW IIIa]] engine.
;F 13ba, ca, da, fa: all with the 149&nbsp;kW (200&nbsp;hp) [[Junkers L2]] upright inline water-cooled engine and a series of structural modifications. The fa variant was about 1&nbsp;m (3&nbsp;ft) longer.
;F 13be, ce, de, fe: as the above but all with 230&nbsp;kW (310&nbsp;hp) [[Junkers L5]] upright inline water-cooled engines.
;F 13dle, fle, ge, he, ke: variants with the Junkers L5 above.
;F 13bi, ci, di, fi,: as ca to fa but all with the 186&nbsp;kW (250&nbsp;hp) [[BMW IV]] engine.
;F 13co, fo, ko: with the 230&nbsp;kW (310&nbsp;hp) [[BMW V|BMW Va]] engine.
;Junkers-Larsen JL-6:American version of the F 13 built by Junkers-Larsen. Eight built.
;Junkers-Larsen JL-12:Ground-attack derivative of the Junkers-Larsen JL-6, with 300&nbsp;kW (400&nbsp;hp) [[Liberty L-12]] engine, armored, and armed with a downward-pointing battery of 30 [[Thompson submachine gun]]s.<ref>{{cite journal |date=2 February 1922 |title=The 'J.L.-12' Attack 'Plane |url=https://www.flightglobal.com/pdfarchive/view/1922/1922%20-%200073.html |url-status=dead |journal=Flight |volume=XIV |issue=5 |page=73 |archive-url=https://web.archive.org/web/20120306172359/http://www.flightglobal.com/FlightPDFArchive/1922/1922%20-%200073.PDF |archive-date=6 March 2012 |access-date=5 September 2018 }}</ref>
;Rimowa Junkers F 13
:Modern replica first flown 15 September 2016.<ref>{{cite magazine |magazine=Air Britain Aviation World |publisher=[[Air-Britain]] |title=General Aviation News |year=2018 |issn=1742-996X |page=114}}</ref> With the approval of the Junkers heirs, [[Rimowa]] Junkers was renamed ''Junkers Flugzeugwerke [[Aktiengesellschaft|AG]]'', and moved to [[Altenrhein]]. Their models have modern features, like more and better instruments, while the outward appearance is the one of a Junkers-Larsen JL-6.<ref>{{Cite web |url=https://www.srf.ch/news/flugzeug-aus-der-ostschweiz-ein-fluggefuehl-wie-anno-1920-aber-mit-modernster-technik |title=Ein Fluggefühl wie anno 1920 – aber mit modernster Technik |date=17 October 2021 |website=Swiss Radio and Television SRF| language=de |trans-title=A feeling of flight like in 1920 - but with the most modern technology}}</ref>

==Operators==
[[File:Ad Astra Aero - JuF13CH91.jpg|thumb|Ad Astra F13 circa 1920]]
[[File:Aeron ensimmäinen konetyyppi (32618985153).jpg|thumb|Finnish F13 in the 1920s]]
[[File:Budai alsó rakpart a Szent Gellért térnél, hidroplán állomás. Fortepan 16369.jpg|thumb|F13 floatplanes<ref>{{cite web|url= https://anno.onb.ac.at/cgi-content/anno-plus?aid=itj&datum=1925&page=72&size=15 |title= Junkers F13 W |date=1925-08-05|publisher= Illustrierte Technik für Jedermann |access-date=2025-08-15}}</ref> in Budapest, Hungary]]
;{{flag|Emirate of Afghanistan|1919}} ({{flag|Kingdom of Afghanistan}} after 1926)
* [[Afghan Air Force]] acquired four aircraft from 1924 through 1928.
;{{flag|Argentina}}
* [[Argentine Air Force]] - three aircraft
;{{flag|Austria}}
* [[Austrian Air Force (1927-1938)]]
* [[Österreichische Luftverkehrs AG|Österreichische Luftverkehrs AG (ÖLAG)]] started flying with F 13 and operated 24 aircraft
;{{flag|Belgium}}
* [[SNETA]]
;{{flag|Bolivia}}
* [[Lloyd Aéreo Boliviano]] received the first F 13 as a gift from the German community on the occasion of the centennial of Bolivian independence.
;{{flag|Brazil}}
* [[Syndicato Condor|Syndicato Condor - Serviços Aéreos Condor]]
* [[Varig]]
;{{flag|Bulgaria}}
* [[Bulgarian Air Force]]
* [[Bunavad]] operated two aircraft between 1927 and 1928.
;{{CHL}}
* [[Chilean Air Force]]
;{{China as ROC}}
;{{COL}}:
* [[Avianca]] as [[SCADTA]]
* [[Colombian Air Force]]
;{{flagicon|Danzig}} [[Free City of Danzig]]
* [[Danziger Luftpost]]
* [[Lloyd Ostflug]]
;{{EST}}
* [[Aeronaut (company)|Aeronaut]] operated F 13 between 1922 and 1927.
;{{FIN}}
* [[Finnair|Aero Airways]]
* [[Kauhajoki Flying Club]]
* [[Finnish Air Force]]
* [[Finnish Border Guard]]
;{{FRA}}
;{{flag|Germany|Weimar}}
* ''[[Junkers Luftverkehr]]'', primary user until merger with [[Deutscher Aero Lloyd]] into Deutsche Luft Hansa
* ''[[Deutsche Luft Hansa]]'' operated about 110 aircraft, a large part taken over from Junkers Luftverkehr.
;{{flag|Hungary|1920}}
* Aero R.T. operated six aircraft between 1923 and 1927.
* [[Aeroexpress Rt.]] (1923−1930)
* Royal [[Hungarian Air Force]]
;{{flag|Iceland|}}
* [[Air Iceland]] operated three aircraft between 1928 and 1931.
;{{flag|Iran|1925}}
* [[Imperial Iranian Air Force]]
;{{flag|Italy|1861}}
;{{JPN}}
;{{flag|Latvia|1918}}
* ''[[Latvijas Gaisa Satiksmes Akciju Sabiedriba]]'' - national airline, operated three aircraft in 1922–1925.
[[File:Lithuania Air Mail 1921.jpg|thumb|First Lithuanian Air Mail stamp (1921) featured Junker F13.]]
;{{flag|Lithuania|1918}}
* [[Lithuanian Air Force]] for a short period operated single aircraft, which crash-landed in Lithuania after illegally passing its border in 1919.

{{Flag|Mexico}}

* [[Mexican Air Force]]<ref>{{Cite web |url=http://www.mexicanaviationhistory.com/articulos/articulo.php?id=18 |title=Mexican Aviation History |website=www.mexicanaviationhistory.com |access-date=31 January 2019 |archive-date=17 July 2009 |archive-url=https://web.archive.org/web/20090717221912/http://www.mexicanaviationhistory.com/articulos/articulo.php?id=18 |url-status=dead}}</ref>

;{{flag|Mongolia|1925}}
* [[Mongolian People's Army|Mongolian People's Army Air Force]] operated three aircraft between 1925 and 1931.
;{{POL}}
* [[Aero-Targ]] leased six aircraft from [[Danziger Luftpost]] in 1921.
* [[Aerolloyd]] (later renamed [[Aerolot]]) operated 16 aircraft between 1922 and 1929.
* [[LOT Polish Airlines]] took over 15 remaining aircraft from [[Aerolot]] and operated them between 1929 and 1936.
;{{POR}}
* ''[[Serviços Aéreos Portugueses]]'' operated one aircraft between 1929 and 1931.
;{{ROM}}
* [[TAROM#The beginnings|LARES]]
* [[Royal Romanian Air Force]]
;{{flag|Soviet Union|1924}}
* [[Deruluft]]
* [[Aviaarktika]] operated several aircraft.
* [[Soviet Air Force]]
;{{flag|South Africa|1928}}
* [[South African Airways]] operated four aircraft obtained from Union Airways.
* [[South African Air Force]]
;{{flag|Spain}}
* [[Union Aérea Española UAE]]
* [[Fuerzas Aéreas]]
* [[Cruz Roja Española]]
;{{SWE}}
* [[Swedish Air Force]]
* [[Aktiebolaget Aerotransport]]
;{{flag|Switzerland|1920}}
* [[Ad Astra Aero]] operated at least four F 13s (registered CH-91/92/93/94) between 1919 and probably 1930.
;{{TUR}}
* [[Turkish Air Force]] operated three aircraft between 1925 and 1933.
* [[Turkish Air Post]] operated two ex-military aircraft between 1933 and 1938.
* [[General Command of Mapping (Turkey)]] operated one ex-air force aircraft (serial no: 882) equipped with aerial photo system from 1933 to 1938.<ref>{{cite web |url = http://www.hgk.mil.tr/english/english.htm |title = General Command of Mapping in Turkey |website = hgk.mil.tr |archive-url=https://web.archive.org/web/20090830052206/http://hgk.mil.tr/english/english.htm |archive-date=30 August 2009 }}</ref>
;{{UK}}
* Civil register lists five F 13s during the 1930s<ref>{{cite book |title=British Civil Register |url=http://www.caa.co.uk/application.aspx?catid=60&pagetype=65&appid=1&mode=summary&aircrafttype=Junkers&dereg=true |access-date=24 March 2009 |archive-date = 16 December 2019 |archive-url=https://web.archive.org/web/20191216221627/http://www.caa.co.uk/application.aspx?catid=60&pagetype=65&appid=1&mode=summary&aircrafttype=Junkers&dereg=true |url-status=dead}}</ref>
;{{flag|United States|1912}}
* [[United States Post Office Department]]
* [[United States Navy]]

==Accidents and incidents==
[[File:H%C3%A4t%C3%A4laskun_tehnyt_Aero_Oy-n_lentokone_Junkers_D335_T%C3%B6%C3%B6l%C3%B6n_tavara-aseman_luona._-_N35451_(hkm.HKMS000005-km0024ye).jpg|thumb|Emergency landing of Finnish [[Finnair|Aero Oy]]'s D335 by the [[VR warehouses]], July 6, 1925, [[Helsinki]]]]
[[File:Lento-onnettomuus_-_N35452_(hkm.HKMS000005-km0023ya).jpg|thumb|Another angle of the damaged airplane]]
* On 1 September 1920, a Junkers-Larsen JL-6 caught fire and crashed in Morristown, NJ. Max Miller, the United States Air Mail Service's first pilot was at the controls and, along with his mechanic/crewman, Gustav Reierson, perished. They managed to eject all nine mail bags before the plane hit the ground.
* On 8 June 1924, a SCADTA F 13, registration A13, stalled and crashed into a tree on takeoff from Barranquilla, Colombia, killing all five on board.
* On 10 March 1926, a [[Latvijas Gaisa Satiksmes Akciju Sabiedriba|Latvijas Gaisa Satiksmes]] F 13, c/n 579, registration No. B-LATA, operating for [[Aero O/Y]], crashed on approach to [[Helsinki]]. No fatalities were registered.<ref>{{Cite web|title=10 Marz 1926|date=10 March 1926|url=https://www.junkers.de/blog/bruch-und-wiederaufbau-einer-junkers-f-13/|access-date=2021-05-18|archive-date=2020-04-07|archive-url=https://web.archive.org/web/20200407143211/https://www.junkers.de/blog/bruch-und-wiederaufbau-einer-junkers-f-13/|url-status=dead}}</ref>
* On 22 March 1925, a [[Zakavia]] F 13, registration R-RECA, crashed on takeoff from [[Tbilisi|Tiflis]], [[Georgia (country)|Georgia]], killing all five on board. This crash is particularly famous because three high ranking Soviet officials died in the crash. [[Solomon Mogilevsky]], [[Alexander Miasnikian|Alexander Myasnikov]], and [[Georgi Atarbekov]] who were flying to meet Trotsky who was in convalescence in [[Sukhum]].
* On 24 July 1926, a Deutsche Luft Hansa F 13, registration D-272, crashed at Juist, Germany due to weather, killing all four on board.
* On 3 September 1926, a SCADTA F 13, registration A-10, collided with cloud-obscured terrain between Honda and La Victoria, Colombia. The two crew and two passengers were injured, and the aircraft was a total loss.
* On 27 July 1927, a Deutsche Luft Hansa F 13, registration D-206, crashed at Amöneburg, Germany after attempting an emergency landing due to engine failure, killing all five on board.
* On 26 May 1928 at 08:15, a Deutsche Lufthansa Junkers F 13, registration D-583, crashed at Hahnenberg, Radevormwald, Germany due to pilot error, killing three of five on board.
* On 21 July 1930, a Croydon-based Walcot Air Line F 13, registration G-AAZK, [[Meopham air disaster|crashed]] at Meopham, near Gravesend, Kent, due to structural failure, killing all six on board including its second pilot, Lt Col George L P Henderson, a pilot with considerable skill and war-time experience.<ref>{{Cite web |url=https://ntrs.nasa.gov/citations/19930094747 |title = The German Investigation of the Accident at Meopham (England) |date = April 1932 |last1 = Blenk |first1 = Hermann}}</ref>
* On 12 July 1932, Czech industrialist [[Tomáš Baťa]] died, together with pilot Jindrich Broucek, when his Junkers J13, registration D-1608 crashed after taking off in heavy fog.
* On 2 November 1932 a Deutsche Luft Hansa F 13, registration D-724, crashed at Echterspfahl, Germany due to wing separation, killing all five on board.
* 23 July 1933, registration CF-ALX named "City of Prince George" crashed into a tree on takeoff in the Canadian wilderness. The wreck was later recovered in 1981 and used as the basis for restoration for museum piece. The aircraft was originally named the Königsgeier (King Vulture).<ref name=":1" />
* On 9 October 1935, an Aero O/Y F 13, registration OH-ALI, crashed into the Gulf of Finland in fog, killing all six on board.

==Survivors==
[[File:1923JunkersF13.jpg|thumb|right|Serial number 715 at Tekniska Museet in Sweden. It flew with [[Junkers Luftverkehr]] (D-343) until 1924 and [[AB Aerotransport]] (SE-AAC) until 1935 <ref>{{cite web |url=http://hugojunkers.pytalhost.com/ju_f13_m9.htm |title=Junkers Relics |access-date=5 April 2010 |url-status=dead |archive-url=https://web.archive.org/web/20110720125217/http://hugojunkers.pytalhost.com/ju_f13_m9.htm |archive-date=20 July 2011 }}</ref>]]There are five surviving F 13 airframes, all in museums.<ref name=":1" />
;Aircraft on display
* Reserve collection<ref>{{Cite web |url=http://pyperpote.tonsite.biz/pages/reservespag.html |title=Reserve collection, Museé de L'Air, Le Bourget |access-date=7 April 2010 |archive-date=6 July 2011 |archive-url=https://web.archive.org/web/20110706145925/http://pyperpote.tonsite.biz/pages/reservespag.html |url-status=dead }}</ref> [[Musée de l'Air et de l'Espace]], Le Bourget, Paris, France<ref>[http://www.aviationmuseum.eu/World/Europe/France/Paris-Le_Bourget/Musee_de_l_air.htm Museé de L'Air, Le Bourget]</ref>
* [[Deutsches Museum]] Munich, Germany<ref>{{Cite web |url=http://www.deutsches-museum.de/en/collections/transport/aeronautics/propeller-planes/from-1918-up-to-1945/junkers-f13/ |title=F 13 at Deutsches Museum, Munich |access-date=7 April 2010 |archive-date=20 July 2015 |archive-url=https://web.archive.org/web/20150720221027/http://www.deutsches-museum.de/en/collections/transport/aeronautics/propeller-planes/from-1918-up-to-1945/junkers-f13/ |url-status=dead }}</ref>
* [[Transport Museum of Budapest]], Hungary<ref>{{cite web |url = http://www.euro-t-guide.com/See_Coun/Hungary/Budapest/HU_See_Budapest_Aviation_Museum_1-1.htm |title = F 13 at the Budapest Aircraft Museum |website = euro-t-guide.com |access-date = 2010-04-07 |archive-date = 2010-05-01 |archive-url = https://web.archive.org/web/20100501134449/http://www.euro-t-guide.com/See_Coun/Hungary/Budapest/HU_See_Budapest_Aviation_Museum_1-1.htm |url-status = dead }}</ref>
* ''SE-AAC'', ex-''D-343'', [[Tekniska museet]], Stockholm, Sweden<ref>{{cite web |url = http://www.tekniskamuseet.se/1/612.html |title = F 13 at the Technical Museum, Stockholm |website = tekniskamuseet.se |archive-url=https://web.archive.org/web/20100920220546/http://www.tekniskamuseet.se/1/612.html |archive-date=20 September 2010 }}</ref>
* [[Tomas Bata Memorial]], Zlín, Czech Republic<ref>{{Cite web |url=https://pamatnikbata.eu/en/homepage/ |title=Uvodni stránka |website=Obnova památníku T.Bati |language=cs-CZ |access-date=25 September 2019}}</ref>

[[File:Junker F 13 wreck DTMB.jpg|thumb|left|F 13 remains from Canada in the Deutsches Technikmuseum Berlin]]
;In storage or under restoration
* [[Deutsches Technikmuseum Berlin]], Germany (this is a wrecked aircraft example)

==Specifications (F 13)==
[[File:Junkers F-13.svg|thumb|200px|Junkers F 13]]

{{Aircraft specs
|ref= ''Hugo Junkers Pionier der Luftfahrt - Seine Flugzeuge'',<ref>Wagner 1996, p. 155.</ref> ''Junkers: an aircraft album No.3''<ref>Turner 1971, p. 20.</ref>
|prime units?= met
<!--
        General characteristics
-->
|crew= two
|capacity= four passengers or {{convert|689|kg|lb|abbr=on|0}} payload
|length m= 9.59
|length note=<br/>
:::'''F 13fe:'''  {{convert|10.50|m|ft|abbr=on|0}}
|span m= 14.8
|span note=<br/>
:::'''F 13fe:'''  {{convert|17.75|m|ft|abbr=on|0}}
|height m= 3.50
|height note=<br/>
:::'''F 13fe:'''  {{convert|3.60|m|ft|abbr=on|0}}
|wing area sqm= 34.50
|wing area note=<br/>
:::'''F 13fe:'''  {{convert|44|m2|sqft|abbr=on|0}}
|empty weight kg= 951
|empty weight note=<br/>
:::'''F 13fe:'''  {{convert|1,480|kg|lb|abbr=on|0}}
|max takeoff weight kg= 1,640
|max takeoff weight note=<br/>
:::'''F 13fe:'''  {{convert|2,318|kg|lb|abbr=on|0}}

<!--
        Powerplant
-->
|eng1 number= 1
|eng1 name= [[Mercedes D.IIIa]]
|eng1 type= six-cylinder water-cooled in-line piston engine
|eng1 kw= 118
|eng1 note=<br/>
:::'''F 13fe:''' 1 x {{convert|228|kW|hp|abbr=on|0}} [[Junkers L5]] six-cylinder water-cooled in-line piston engine
<!--
        Performance
-->
|max speed kmh= 173
|max speed note=<br/>
:::'''F 13fe:''' {{convert|198|km/h|mph|abbr=on|0}}
|cruise speed kmh= 160
|cruise speed note=<br/>
:::'''F 13fe:''' {{convert|170|km/h|mph|abbr=on|0}}
|range km= 1,400
|ceiling m= 5,000
|ceiling note=<br/>
:::'''F 13fe:''' {{convert|5,090|m|ft|abbr=on|0}}
|climb rate ms= 2.40
|power/mass= 0.0712 kW/kg (0.0443 hp/lb)
}}

==See also==

===Related developments===
* [[Junkers W 33]]
* [[Junkers W 34]]
* [[Junkers K 43]]
* [[Junkers Ju 46]]

==References==
===Citations===
{{Reflist}}

===Bibliography===
* Andersson, Lennart. "Chinese 'Junks': Junkers Aircraft Exports to China 1925-1940". ''Air Enthusiast'', No. 55, Autumn 1994, pp.&nbsp;2–7. {{ISSN|0143-5450}}
* {{cite journal |last1=Andersson |first1=Lennart |title=Histoire de l'aéronautique persane, 1921–1941: La première aviation du Chah d'Iran |journal=Avions: Toute l'aéronautique et son histoire |date=July 1998 |issue=76 |pages=2–12 |trans-title=History of the Persian Air Force, 1921–1941: The First Aircraft of the Shah of Iran |language=French |issn=1243-8650}}
* Andersson, Lennart. "Talkback". ''[[Air Enthusiast]]'', No. 18, April – July 1982. p.&nbsp;80. {{ISSN|0143-5450}}.
* {{cite journal |last1=Andersson |first1=Lennart |title=Round-Out |journal=Air Enthusiast |date=March–April 1999 |issue=80 |page=80 |issn=0143-5450}}
* Dulaitis, David D. "Talkback". ''[[Air Enthusiast]]'', No. 18, April – July 1982. pp.&nbsp;79–80. {{ISSN|0143-5450}}.
* {{cite magazine |last=Emrich |first=Christian |title=Talkback |magazine=[[Air Enthusiast]] |date=December 1981 – March 1982 |issue=17 |pages=34–35 |issn=0143-5450}}
* {{cite journal |last1=Ferguson |first1=William Paul |title=The Canadian Junkers: An Arctic Journey |journal=Air Enthusiast |date=1977 |issue=3 |pages=109–112 |issn=0143-5450}}
* Gerdessen, F. "Estonian Air Power 1918 – 1945". ''[[Air Enthusiast]]'', No. 18, April – July 1982. pp.&nbsp;61–76. {{ISSN|0143-5450}}.
* {{cite magazine |last=Gerdesson |first=F. |title=Talkback |magazine=[[Air Enthusiast]] |date=December 1981 – March 1982 |issue=17 |page=34 |issn=0143-5450}}
* Guest, Carl-Fredrick. "Talkback". ''[[Air Enthusiast]]'', No. 18, April – July 1982. pp.&nbsp;78–79. {{ISSN|0143-5450}}.
* {{cite magazine |last=Terry |first=Gerard |title=Talkback |magazine=[[Air Enthusiast]] |date=December 1981 – March 1982 |issue=17 |page=35 |issn=0143-5450}}
* {{cite book |title= Junkers: an aircraft album No.3 |last1=Turner |first1=P. St. John |year=1971 |name-list-style=amp |last2=Nowarra |first2=Heinz J. |publisher=Airco Publishing Co. |location=New York, US |pages=17–20 |isbn=0-668-02506-9 }}
* {{cite book |last = Wagner |first = Wolfgang |title = ''Hugo Junkers'' Pionier der Luftfahrt - Seine Flugzeuge |publisher = Bernard & Graefe Verlag |location = Bonn, Germany |date = 1996 |language = de |ISBN = 3-7637-6112-8}}
* [https://ntrs.nasa.gov/citations/19930085313 "All-metal Junkers airplane, type F 13"] ''[[National Advisory Committee for Aeronautics]]'', 1 May 1926. NACA-AC-6, 93R14603.

== Further reading ==
* {{Cite book |last1=Cicalesi |first1=Juan Carlos |last2=Rivas |first2=Santiago |title=Junkers F13 / W34 / K43 / Ju52 |year=2009 |editor-first=Jorge Felix |editor-last=Núñez Padin |publisher=Fuerzas Aeronavales |series=Serie en Argentina |volume=3 |language=es |isbn=978-987-20557-7-6 |location=Bahía Blanca, Argentina |url=http://www.fuerzasaeronavales.com/?product=libro-junkers-f13-w34k43-y-ju-52-serie-en-argentina-no3 |access-date=24 August 2015 |archive-url=https://web.archive.org/web/20150924015924/http://www.fuerzasaeronavales.com/?product=libro-junkers-f13-w34k43-y-ju-52-serie-en-argentina-no3 |archive-date=24 September 2015 |url-status=dead }}
* Endres: The Junkers F13 in Poland (Air Pictorial)
* {{cite journal |title=The Junkers All-metal Monoplane |journal=Flight |date=18 January 1923 |volume=XV |issue=3 |pages=35–38 |url=https://www.flightglobal.com/pdfarchive/view/1923/1923%20-%200035.html}}
* Pohlmann: Prof. Junkers nannte es "Die Fliege" ({{ISBN|3-87943-982-6}})
* Stroud: Wings of Peace: The Junkers F13 (Aeroplane Monthly)
* Vagvolgyi: Junkers F-13 : a Junkers repulogepek tortenete 1909-tol 1932-ig"
* Waernberg: Junkers F-13 det forsta trafikflygplanet i Sverige (Karlskrona 1992) {{oclc|186409952}}
* Wagner: Junkers F13 und ihre Vorlaeufer ({{ISBN|3-88064-015-7}})
* {{cite book |last = Zuerl |first = Walter |title = Deutsche Flugzeug Konstrukteure |location = München, Germany |publisher = Curt Pechstein Verlag |year = 1941 }}

==External links==
{{commons category|Junkers F 13}}
* [http://hugojunkers.bplaced.net/junkers-f13.html Junkers F13] on the Hugo Junkers Homepage.
* [http://www.idflieg.com/junkers-f13.htm Junkers F 13 photos from the Budapest Aviation Museum]

{{Junkers aircraft}}
{{Swedish military aircraft designations}}

{{Authority control}}

[[Category:1910s German airliners]]
[[Category:Junkers aircraft|F 13]]
[[Category:Aircraft first flown in 1919]]