Albatros J.I

{{Infobox aircraft |name= Albatros J.I |image= Albatros J.I.jpg |caption= |type= Ground-attack aircraft |manufacturer= [[Albatros Flugzeugwerke]] |designer= |first_flight= [[1917 in aviation|1917]] |introduction= [[1917 in aviation|1917]] |retired= [[1921 in aviation|1921]] |status= |primary_user= ''[[Luftstreitkräfte]]'' |more_users= [[Polish Air Force]] |produced= |number_built= ~240 |developed_from= [[Albatros C.XII]] |variants= }}

The '''Albatros J.I''' was an armored [[ground attack airplane]] designed and produced by the German aircraft manufacturer [[Albatros Flugzeugwerke]]. It saw active combat during the final months of the [[First World War]].

The J.I was a "[[Idflieg aircraft designation system|J-class]]" derivative of the [[Albatros C.XII]] [[reconnaissance]] aircraft; it shared both the wings and [[Empennage|tail]] of the C.XII while adopting a new semi-armoured [[fuselage]] to protect its occupants from the anticipated ground fire from conducting low-altitude [[air-to-ground|attack]] and reconnaissance missions over the battlefield. It was armed with three 7.92 mm (.312 in) [[machine gun]]s, two of which were fixed in a downwards position for [[strafing]] ground targets. The heavy armouring around the crew compartment negatively impacted its performance capabilities.

During April 1918, units of the ''[[Luftstreitkräfte]]'' began receiving the J.I; it was commonly well-received by its crews due to its protection and good visibility. While the newer [[Albatros J.II]] began to replace it in frontline use only months later, the aircraft continued to be operated through to the [[Armistice of 11 November 1918]] that ended the conflict. In addition to Germany, the J.I also was operated by [[Austria-Hungary]], [[Poland]], [[Norway]], and [[Ukraine]]. Poland, which had captured ten aircraft during the [[Greater Poland Uprising (1918–19)|Greater Poland Uprising]], deployed them into combat during the [[Polish–Soviet War]]; the [[Ukrainian People's Army]] also used J.Is against the [[Soviet Union]].

==Design and development== [[File:German ground attack plane on display in the US c1919.jpg|thumb|A captured German Albatros J.I on display in the United States, circa 1919]] The Albatros J.I was developed specifically as a "[[Idflieg aircraft designation system|J-class]]" aircraft, which had the purpose of conducting low-altitude battlefield [[reconnaissance]] and [[air-to-ground|ground-attack]] missions with the intended mission altitudes being around 50 meters (150 feet). Albatros' design team opted to develop the J.I as a derivative of the [[Albatros C.XII]] reconnaissance aircraft. In terms of its general configuration, the J.I shared both the wings and [[Empennage|tail]] of the C.XII while adopting a new slab-sided [[fuselage]], which was semi-armoured to protect its occupants from ground fire.<ref name="Grey and Thetford p. 53">Grey and Thetford 1962, p. 53.</ref> This [[steel]] plate armouring around the crew compartment, which weighed 490 kg (1,080 lb), came at a substantial cost in terms of performance. The poor climb performance was not deemed to be particularly impactful as the J.I was intended to continuously fly at a relatively low altitude throughout its entire mission profile.<ref name="Grey and Thetford p. 5354">Grey and Thetford 1962, pp. 53-54.</ref>

The overall design of the fuselage conformed to Albatros' established conventions, comprising multi-ply [[former]]s, six primary [[longeron]]s, and skinned using [[plywood]] that was both pinned and glued to the structure.<ref name="Grey and Thetford p. 53"/> While the bottom of the fuselage was flat, the top decking had an almost semi-circular curvature. Both the sides and bottom of the fuselage were covered by 5 mm thick [[Chrome plating|chrome]]-[[nickel]] steel plate, which was bolted directly onto the wooden frame.<ref name="Grey and Thetford p. 5455">Grey and Thetford 1962, pp. 54-55.</ref> Aft of the cockpit, the exterior was covered by plywood instead. To avoid compromising the armour, there was no cutaway on either side of the forward cockpit to facilitate the pilot's entry and egress; instead, an outwards-folding panel was present.<ref name="Grey and Thetford p. 54">Grey and Thetford 1962, p. 54.</ref>

Unlike the C.XII, which was powered by the [[Mercedes D.IVa]] engine, capable of up to {{convert|260|hp|kW|abbr=on|disp=flip}}, the J.I was instead equipped with the [[Benz Bz.IV]], which could produce up to {{convert|200|hp|kW|abbr=on|disp=flip}}; this choice in powerplant in combination with the considerably heavier fuselage was heavily responsible for the J.I's performance capabilities being marginal at best.<ref name="Grey and Thetford p. 3653">Grey and Thetford 1962, pp. 36, 53.</ref> While partially covered by rounded sheet metal, the nose of the aircraft was unarmoured and thus the engine was left relatively unprotected. As a consequence of the nose's downwards sloping, pilots of the J.I enjoyed relatively favourable forward visibility.<ref name="Grey and Thetford p. 5354"/>

As a ground-attack aircraft, the J.I was armed with a pair of fixed 7.92 mm (.312 in) Spandau [[LMG 08/15]] [[machine gun]]s that faced downwards for the purpose of [[strafing]] ground targets; the observer was also provided with a separate freely-moving 7.92 mm [[Parabellum MG14]] machine gun.<ref name="Grey and Thetford p. 55"/>

==Operational history== [[File:Albatros J.I - Ray Wagner Collection Image (21256885339).jpg|thumb|An Albatros J.I]] During April 1918, units of the ''[[Luftstreitkräfte]]'' began receiving the J.I. Shortly thereafter, the type saw its combat debut during the [[Battle of the Lys (1918)|Battle of the Lys]]. The J.I were typically issued to ''Flieger Abteilungen'' in support of the Army Corps or Army Headquarters; operationally, it was typically flown in flights comprising three to six aircraft at a time.<ref name="Grey and Thetford p. 55"/> The type was relatively popular amongst its crews, often due to the armor protection provided and the good visibility facilitated by its low set engine. It was commonly deemed to be an operational success, although a frequent criticism of the J.I was that its armour was still inadequate.

By June 1918, the new [[Albatros J.II]] had started to replace J.I at the front. Nevertheless, the older aircraft nevertheless served until the [[Armistice of 11 November 1918|end of the conflict]]. Two were bought by [[Austria-Hungary]]. After the conflict, J.Is remained in operation for a time with several nations, including [[Poland]], [[Norway]], and [[Ukraine]]. Poland was the largest post-war user of the type, operating 10 aircraft, which were captured during the [[Greater Poland Uprising (1918–19)|Greater Poland Uprising]].<ref name="morg 30">Morgała 1997, p. 30.</ref> These J.Is were used during the [[Polish–Soviet War]]. Additionally, between September 1920 and February 1921, four aircraft were lent by the Polish to an allied 1st ''Zaporizhska'' Aviation Escadrille of the [[Ukrainian People's Army]].<ref name="morg 30"/>

==Operators== ;{{flag|German Empire}} * ''[[Luftstreitkräfte]]'' ;{{POL}} * [[Polish Air Force]] operated 10 aircraft postwar until 1921 ;{{UKR}} * [[Ukrainian People's Army]] operated four aircraft, lent by the Polish

==Specifications (J.I)== [[File:Albatros J.I dwg.jpg|thumb|Albatros J.I drawing]] {{Aircraft specs |ref= ''German Aircraft of the First World War''<ref name="Grey and Thetford p. 55">Grey and Thetford 1962, p. 55.</ref> |prime units? = met |crew= two (pilot and observer) |length m= 8.80 |length ft= 28 |length in= 10 |span m= 14.14 |span ft= 46 |span in= 5 |height m= 3.37 |height ft= 11 |height in= 1 |wing area sqm= 43.0 |wing area sqft= 463 |empty weight kg= 1,398 |empty weight lb= 3,082 |gross weight kg= 1,808 |gross weight lb=3,986 |eng1 number= 1 |eng1 name= [[Benz Bz.IV]] |eng1 kw=150 |eng1 hp=200 |max speed kmh= 140 |max speed mph= 90 |range km= 350 |range miles= 220 |ceiling m= 4,500 |ceiling ft= 14,800 |climb rate ms= 2 |climb rate ftmin= 400 |armament = * 2 × 7.92 mm (.312 in) Spandau [[LMG 08/15]] machine guns, fixed downward * 1 × 7.92 mm (.312 in) [[Parabellum MG14]] machine gun for observer }}

==See also== {{aircontent  |related= * [[Albatros C.XII]] * [[Albatros J.II]] |similar aircraft= * [[AEG J.I]] * [[AEG J.II]] * [[Junkers J.I]] |lists= |see also= }}

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

===Bibliography=== * {{cite book |last1 = Grey |first1 = Peter |first2 = Owen |last2 = Thetford |title = German Aircraft of the First World War |publisher = Putnam |location = London, UK |year = 1970 |edition = Second |isbn = 0-370-00103-6}} *{{cite book |last1=Herris |first1=Jack |title=Albatros Aircraft of WWI: A Centennial Perspective on Great War Airplanes: Volume 3: Bombers, Seaplanes, J-Types |date=2017 |publisher=Aeronaut Books |location=Charleston, South Carolina |isbn=978-1-935881-49-0|series=Great War Aviation Centennial Series |volume=26}} * {{cite book |last = Morgała |first = Andrzej |date = 1997 |title = Samoloty wojskowe w Polsce 1918-1924 |trans-title = Military aircraft in Poland 1918-1924 |language = pl |location = Warsaw, Poland |publisher = Lampart |isbn = 83-86776-34-X }}

==Further reading== {{Commons category}} * {{cite book |last1 = Herris |first1 = Jack |title = German Armored Warplanes of WWI: A Centennial Perspective of Great War Airplanes |date = 2012 |publisher = Aeronaut Books |location = Charleston, South Carolina, US |isbn = 978-1-935881-11-7 |series = Great War Aviation Centennial Series |volume = 4}}

[[Category:Biplanes]] [[Category:Single-engined tractor aircraft]] [[Category:1910s German attack aircraft]] [[Category:Albatros aircraft|J.I]] [[Category:Aircraft first flown in 1917]]