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The Junkers J.I (manufacturer's name J 4) was a German "J-class" armored sesquiplane of World War I, developed for low-level attack aircraft, observation and liaison aircraft. It is especially noteworthy as being the first all-metal aircraft to enter mass production; the aircraft's metal construction and heavy Vehicle armour was a shield against small arms fire over the battlefield.Taylor 1989, p. 538.
There was a significant size difference between the upper and lower wings – the upper wing had an area of , over double the area of the lower wing – . This is a form of biplane known as a sesquiplane.
The aircraft had two fuel tanks with a capacity of around . The main tank (divided in two for redundancy) was supplemented by a smaller, gravity tank. This was intended to supply fuel to the engine by gravity feed in the event of an engine fuel pump failure; it contained enough fuel for thirty minutes on full power. There was a manual fuel pump for use when the gravity tank was empty.
The aircraft could be separated into its main components: wings, fuselage, undercarriage and tail, to make it easier to transport by rail or road. A ground crew of six to eight could reassemble the aircraft and have it ready for flight within four to six hours. Flight 18 March 1920, p. 317. The wings were covered with aluminium skin which could be easily dented; great care had to be taken when handling the aircraft on the ground.
The aircraft could be fitted with two downward-firing machine guns for ground attack but they were found to be of limited use because of the difficulty of aiming them. The J-Is were mainly used for army co-operation and low-level reconnaissance. They were also used for dropping ammunition and rations on outposts that could not be easily supplied by other means.
The production at Junkers works was quite slow because of poor organization and only 227 J.Is were manufactured before production ceased in January 1919.Grosz 1993, pp. 6–7. At least one was lost to ground fire, shot down by a French anti-aircraft machine-gun firing armour-piercing rounds, although this was apparently an isolated event as some sources claim none were lost in combat. Flight February 1920, p. 229. Some were lost in landing accidents and other mishaps.Grey 1919, pp. 320a–321a.
A Junkers J.I fuselage exists at the Italian Air Force Museum in Bracciano. This aircraft was previously exhibited at the Leonardo da Vinci Museum at Milano and was restored at the Deutsche Technikmuseum Berlin between 2005 and 2010.
A flyable Junkers J.I replica is under construction in Hungary.
Operators
Surviving aircraft
Only one relatively complete aircraft survived, bearing German military serial number J.I 586/18. It is preserved at the Canada Aviation and Space Museum in Ottawa, Ontario, Canada. This aircraft, construction number 252, was manufactured in 1918 and was a war trophy that was sent to Canada in 1919. It was in the possession of the Canadian War Museum before being transferred to the Canada Aviation and Space Museum in 1969.
Specifications
See also
Notes
Bibliography
(1987). 9780851778099, Putnam. ISBN 9780851778099
(2025). 9781935881117, Aeronaut Books. ISBN 9781935881117
(2025). 9781935881650, Aeronaut Books. ISBN 9781935881650
Further reading
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