|Max Immelmann of Feldflieger Abteilung 62 in the cockpit of his Fokker E.I., bearing IdFlieg serial E.13/15|
|Designer||Anthony Fokker & Martin Kreutzer|
|First flight||Early 1915|
The Fokker E.I was the first fighter aircraft to enter service with the Deutsches Heer's Fliegertruppe air service in World War I. Its arrival at the front in mid-1915 marked the start of a period known as the "Fokker Scourge" during which the E.I and its fellow Eindecker successors achieved a measure of air superiority over the Western Front.
Design and development
The E.I was essentially an armed version of the Fokker M.5K single-seat reconnaissance aircraft(military designation A.III), which was in turn very closely based on the design of the 1913 French Morane-Saulnier Type H. Like the Morane, the Fokker was an externally braced mid-winged monoplane with a vertically tapered box section fuselage, with fully movable horizontal and vertical stabilizing surfaces, also known as "flying" surfaces, giving the pilot the usual tail control functions; roll control was achieved through controlled wing warping, as was conventional in contemporary monoplanes. Wing warping was achieved through external cables attached to the surface and running through a king post located in the front of the cockpit. The fuselage structure was fabric covered welded steel tubing, the biggest difference between the Fokker and the Morane, which had an entirely wooden framework. Welded steel tube provided the basis for the structure of all Fokker fuselages for many years.
This unremarkable and derivative design was, however, transformed into a formidable fighter when it was fitted with the newly developed synchronizer gear, the Fokker Stangensteuerung system, firing a single 7.92 mm (.312 in) Parabellum LMG 14 or Spandau lMG 08 machine gun through the spinning propeller. Indeed the five production prototype airframes for the E.I design had been ordered and were under construction as A.IIIs but were completed as M.5K/MG aircraft, retaining the earlier "shoulder-wing" placement of the A.III type. Subsequent production E.Is had their wings lowered slightly – as Leutnant Otto Parschau's E.1/15 had later in its career during 1915 – from the M.5's shoulder configuration, which improved pilot visibility. (These were designated by Fokker as the M.14, which was also used for the following two Eindecker variants.)
All Fokker E.I aircraft had a 68.5 l (18.1 US gal) capacity, single gravity fuel tank, located forward of the cockpit, with a fuel gauge protruding from the sheet metal upper nose paneling, usually offset slightly to port.
Two German pilots, Leutnants Otto Parschau and Kurt Wintgens, worked closely with Anthony Fokker in early 1915 during evaluation of the M.5K/MG. Wintgens is known to have downed a two-seat Morane-Saulnier Type L parasol monoplane on 1 July 1915 while flying his M.5K/MG, but as the victory occurred in the airspace behind Allied lines, over the Fôret de Parroy near Luneville, this could not be confirmed at the time. A similar victory over another Morane "Parasol" two-seater, again unconfirmed, was scored by Wintgens three days later. On the 15th, Wintgens scored his first confirmed victory over a third Morane Parasol, the earliest known confirmed aerial victory for anyone flying a Fokker E-series monoplane in combat.
The M.5K/MG usually used the Parabellum MG14 machine gun for the synchronized armament, which could prove to be a troublesome arrangement, and the five M.5K/MGs built by the Fokker factory in Schwerin/Gorries retained the "shoulder-wing" position of the M.5k for the monoplane wing. Parschau's E.1/15 later had its wing lowered to the "mid-wing" position of the production E.Is, while the remaining four were not known to have been changed. Oswald Boelcke, future German aerial tactician, was issued the third production M.5K/MG, which he flew during July 1915 with Feldflieger Abteiling 62, based near Douai and shared flying time with Max Immelmann After Boelcke achieved his own first aerial victory on July 4 with an Albatros C.I armed two-seat observation aircraft, Boelcke would score his first single-seater victory with E.3/15, over a B.E.2c British two-seater near Arras on 19 August 1915. Immelmann would very soon receive his own lMG 08-armed E.I, serialed E.13/15 for his own use.
E.Is were mainly flown by regular pilots of the Fliegertruppen des deutschen Kaiserreiches, with one Eindecker attached to each six-aircraft Feldflieger Abteilung aerial observation/reconnaissance unit. The first step towards specialist fighter-only aviation units within the German military was the establishment of the so-called Kampfeinsitzer Kommando (single-seat battle unit, abbreviated as "KEK") formations by Inspektor-Major Friedrich Stempel in February 1916, as the E.Is started to leave front-line service. 
Following the era of the "KEK" units through the summer of 1916, the Fliegertruppen forces were renamed the Luftstreitkräfte in October 1916, with both units directly serving the German Army; the formation of specialised Jastas (fighter squadrons) in the German air service was still to come. Two E.Is were supplied to the Austro-Hungarian air force and five to the Kaiserliche Marine in April 1916. The E.I was soon joined by the improved Fokker E.II and, as the first E.Is were entering service in June 1915, the first of the E.II type was being demonstrated by Anthony Fokker. Nevertheless E.I production continued in parallel with the E.II, depending on the availability of the Oberursel engines. By 1916, a total of 54 had been manufactured and delivered to the German Army, Navy and the Austro-Hungarian army.
- Crew: one, pilot
- Length: 7.22 m (23 ft 7 in)
- Wingspan: 8.85 m (29 ft 0 in)
- Height: 2.9 m (9 ft 5½ in)
- Wing area: 15.9 m² (172.2 ft²)
- Empty weight: 360 kg (789 lb)
- Loaded weight: 563 kg (1,241 lb)
- Powerplant: 1 × Oberursel U.0 7-cylinder air-cooled rotary engine (clone of Gnome Lambda engine) using various makes of 2-blade propellers, from 2.3 to 2.5 meters (7.55 to 8.20 ft) diameter, 80 hp (60 kW)
- Maximum speed: 130 km/h (81 mph)
- Range: 198 km at 110 km/h (123 mi at 68 mph)
- Service ceiling: 3,000 m (9,840 ft)
- Rate of climb: 20 min to 2,000 m (6,560 ft)
- 1 × forward-firing 7.92 mm (.312 in) Spandau lMG 08 machine gun (one Parabellum MG14 M/G on prototypes)
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- Winchester 2006, p. 15.
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- Grosz 2002
- vanWyngarden 2006, p. 12.
- vanWyngarden 2006, pp. 13–14.
- vanWyngarden 2006, p. 16.
- Guttman, Jon (Summer 2009). "Verdun: The First Air Battle for the Fighter: Part I - Prelude and Opening" (PDF). http://www.worldwar1.com. The Great War Society. p. 9. Retrieved May 26, 2014.
- Winchester 2006, p. 16.
- Boyne, Walter J. The Smithsonian Book of Flight for Young People. Washington, DC: Smithsonian Institution, 1988. ISBN 0-689-31422-1.
- Dierikx, Marc. Fokker: A Transatlantic Biography. Washington, DC: Smithsonian Institution Press, 1997. ISBN 1-56098-735-9.
- Grosz, Peter M. Fokker E I/II (Windsock Datafile No. 91). Berkhamsted, Herts, UK: Albatros Publications, 2002. ISBN 1-902207-46-7.
- Jarrett, Phillip. "Database: The Fokker Eindeckers". Aeroplane Monthly, December 2004.
- vanWyngarden, Greg. Early German Aces of World War I (Osprey Aircraft of the Aces 73). Botley, Oxfordshire, UK: Osprey, 2006. ISBN 978-1-84176-997-4.
- Winchester, Jim. Fighter: The World's Finest Combat Aircraft - 1913 to the Present Day. New York: Barnes & Noble Publishing, Inc. and Parragon Publishing, 2006. ISBN 0-7607-7957-0.