Fokker Eindecker fighters

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Eindecker
Captured Fokker E.III 210/16 in flight at Upavon, Wiltshire in 1916, and still in existence in the 21st century.
RoleFighter
ManufacturerFokker
First flight23 May 1915 (modified M.5 serving as a E.1 prototype)[1]
Number built416
 
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Eindecker
Captured Fokker E.III 210/16 in flight at Upavon, Wiltshire in 1916, and still in existence in the 21st century.
RoleFighter
ManufacturerFokker
First flight23 May 1915 (modified M.5 serving as a E.1 prototype)[1]
Number built416

The Fokker Eindecker fighters were a series of German World War I monoplane single-seat fighter aircraft designed by Dutch engineer Anthony Fokker.[2] Developed in April 1915, the first Eindecker ("Monoplane") was the first purpose-built German fighter aircraft and the first aircraft to be fitted with synchronisation gear, enabling the pilot to fire a machine gun through the arc of the propeller without striking the blades.[2] The Eindecker granted the German Air Service a degree of air superiority from July 1915 until early 1916. This period was known as the "Fokker Scourge," during which Allied aviators regarded their poorly armed aircraft as "Fokker Fodder".

Contents

Design and development

The Eindecker was based on Fokker's unarmed Fokker M.5K scout, also given the military designation Fokker A.III, itself following very closely the design of the French Morane-Saulnier H shoulder-wing monoplane but using chrome-molybdenum steel tubing for the basic fuselage structure instead of wooden components, which was fitted with a synchronizer mechanism controlling a single Parabellum MG14 machine gun. Anthony Fokker personally demonstrated the system on 23 May 1915, having towed the prototype aircraft behind his touring car to a military airfield near Berlin.[1]

A close-up photo of Otto Parschau's first Fokker monoplane, armed with a synchronized Parabellum MG14 machine gun in June 1915, which essentially became the "prototype" Fokker Eindecker.

The history of what ended up being the "prototype" Eindecker aircraft, which bore Fokker factory serial number 216, is closely associated with Leutnant Otto Parschau, who was given the "No.216" Fokker A-series monoplane at the beginning of World War I, which bore the Idflieg military serial number A.16/15. This initially unarmed monoplane had belonged to one Oberleutnant von Buttlar, and had been painted a shade of green, the color of von Buttlar's Marburg-based Jäger regiment.[3] Parschau eventually spent most of his first year's time in the war with this aircraft, which was marked with the words "Lt. Parschau" on the right upper side of the fuselage behind the cockpit, flying it on both fronts that the German Empire was involved in combat. A short time before the beginning of June 1915, while based at Douai with Feldflieger Abteilung 62, the Fokker factory outfitted Parschau's aircraft with the Fokker Stangensteuerung synchronizer and a Parabellum MG14 light machine gun for its armament, with which Parschau had tried some initial attempts in aerial combat during June 1915, when the Parabellum gun repeatedly jammed in action. Parschau's aircraft also had an aft-cockpit-located main fuel tank. The aircraft would later be taken back by Fokker for factory armament installation trials, which also allowed the wing location to be lowered to mid-fuselage, a position that would become standard for all regular production Eindeckers. The initial batch of five M.5K/MG production prototypes were completed by the Fokker factory with the shoulder-mount wing mounting location that the original M.5s had used.[4]

All the E.I to E.IV Eindeckers used a gravity fuel tank which had to be constantly filled by hand-pumping from the main fuel tank, which starting with the Fokker E.II was mounted behind the pilot; this task had to be performed up to eight times an hour. Both the rudder and elevator were aerodynamically balanced, and the type had no fixed tail surfaces. This combination rendered the Eindecker very responsive to pitch and yaw. For an inexperienced pilot, the extreme sensitivity of the elevators made level flight difficult; German ace Leutnant Kurt Wintgens, who along with Leutnant Parschau were the primary Luftstreitkräfte pilots responsible for bringing the first armed Fokker monoplanes into active service during the spring and summer of 1915, once stated "lightning is a straight line compared with the barogram of the first solo". The roll response of the Eindecker, on the other hand, was poor. This is often blamed on the use of wing-warping rather than ailerons - although monoplanes of the time, even when fitted with ailerons, often had unpredictable or unresponsive roll control due to the flexibility of their wings.

The main difference between the E.I and E.II was the engine - the former having the seven-cylinder 60 kW (80 hp) Oberursel U.0 rotary engine which was essentially a direct copy of the French-made 60 kW (80 hp) Gnome Lambda seven-cylinder rotary engine, while the latter had the nine-cylinder 75 kW (100 hp) Oberursel U I, a direct copy of the 75 kW (100 hp) Gnome Monosoupape rotary. Both the E.I and E.II versions used the M.5's original 1.88 meter (74 inch) wing chord dimension. Production of the types, built in parallel, depended on engine availability. Many E.IIs were either completed as E.IIIs or upgraded to E.III standard when returned for repair.

Profile view of an Eindecker at takeoff.

The definitive version of the Eindecker was the Fokker E.III, which used a slightly narrower-chord (1.80 meter, or 71 inch) wing than earlier versions. Boelcke's Feldflieger Abteilung 62 began operating the E.III towards the end of 1915. A few E.IIIs were experimentally armed with two 7.92 mm (.312 in) calibre LMG 08 "Spandau" machine guns, while most E.IIIs and the production E.I through E.III Eindecker models used only one of the same model. The final variant was the Fokker E.IV which received a 119 kW (160 hp) Oberursel U.III, 14 cylinder twin-row rotary engine (a copy of the Gnome Double Lambda rotary) and was fitted with twin machine guns as standard, after repeated failure of an experimental triple-gun installation, which was initially intended be standard for the E.IV.

Total production for the entire Fokker E.I through E.IV series was 416 aircraft (one aircraft's type is unknown).

Operational history

The actual Fokker M.5K/MG aircraft used by Leutnant Kurt Wintgens, in his pioneering aerial engagement on 1 July 1915

The first Eindecker victory, though unconfirmed, was achieved by Leutnant Wintgens on 1 July 1915 when, while flying one of the five M.5K/MG production prototype aircraft, numbered 'E.5/15', he forced down a French Morane-Saulnier L two seat "parasol" monoplane. By this time the first E.Is were arriving as supplementary equipment, one per unit as "attached" aircraft, for the ordinary Feldflieger Abteilung - initially to provide escort protection for their usual quantity of six two-seat reconnaissance biplanes per unit.

Three days after his "unconfirmed" victory, Wintgens downed another "Morane Parasol" with the same E.5/15 aircraft, and a full fortnight after his initial engagement, on 15 July 1915, he became the first Eindecker pilot to be credited with such an official victory.

The two most famous Eindecker pilots were Oswald Boelcke (initially flying M.5K/MG aircraft E.3/15) and Max Immelmann, both of Feldflieger Abteilung 62, who scored their first kills in E.Is in August 1915. Leutnant Otto Parschau, who was instrumental in the introduction of the Eindecker from the very start, flew the M.5K/MG aircraft numbered E.1/15, after the Fokker factory took back his worn-out A.16/15 aircraft.

Oswald Boelcke scored the most Eindecker victories - 19 out of his final tally of 40. His last victory in an Eindecker occurred on 27 June 1916. Max Immelmann had the second-highest Eindecker score. He achieved all of his 15 victories in the type before being killed when his E.III broke up in June 1916 after the synchronisation mechanism failed, causing at least 7 bullets to shoot through one propeller blade, which broke off. The resulting vibrations were so severe that the loads exceeded the structural limits of the aircraft. 11 pilots scored five or more victories in the Eindecker. Boelcke, Immelmann and Wintgens all received Germany's highest military decoration, the Pour le Mérite or "Blue Max", while flying the Eindecker, after each pilot passed the then-required eight victory total for each aviator.

The arrival in early 1916 of the Airco DH.2 and Royal Aircraft Factory F.E.2 and F.E.8 pusher aircraft, along with the French Nieuport 11, brought the dominance of the Eindecker to an end, and with it, the "Fokker Scourge". Wintgens flew the E.IV version of the Eindecker long enough to have been confronted by the much more advanced SPAD S.VII fighter of French flying ace Alfred Heurteaux on September 25, 1916, which resulted in Heurteaux fatally bringing down Wintgens, as Huerteaux's victory number eight.

Variants

Fokker M.5
Fokkers first monoplane unarmed scout, in effect the "airframe prototype" of all the early Fokker Eindeckers.
Fokker M.5K
K for Kleine - short span wings
Fokker M.5L
L for Lange - long span wings
Fokker M.5K/MG
Pre-production batch, with /MG suffix for maschinengewehr - machine gun, five built (see A.III).
Fokker A.II
Military designation for the M.5L unarmed scouting aircraft with three bracing cables per wing and powered by a 80hp Oberursel U.0 rotary engine; at least one was built.
Fokker A.III
Military designation for the M.5K unarmed scouting aircraft powered by a 80hp Oberursel U.0 rotary engine; 5 built (see M.5K/MG).
Fokker E.I
Production armed scout aircraft powered by a 80hp Oberursel U.0 rotary engine, 68 built
Fokker E.II
Improved production armed scout aircraft powered by a 100hp Oberursel U.I rotary engine, 49 built
Fokker E.III
The major production variant also powered by a 100hp Oberursel U.I rotary engine with improved structure and equipment, 249 built
Fokker E.IV
The final version of the early Eindeckers the E.IV was slightly enlarged, fitted with a 14-cyl. Oberursel U.III engine and two machine guns above the forward fuselage, 49 built

Note:The Fokker E.V bore no direct relation to the earlier Eindeckers, being a parasol aircraft, only built in small numbers before production switched to the improved Fokker D.VIII.

Survivors

Max Immelman Fokker EI

Only one original Eindecker remains. On 8 April 1916, a novice German pilot took off from Valenciennes with a new E.III (IdFlieg serial number 210/16) bound for Wasquehal but became lost in haze and landed at a British aerodrome east of St. Omer. He was forced to surrender before he realised his error and could destroy the aircraft. The E.III was test-flown against the Morane-Saulnier N and other Allied types at St. Omer before going to Upavon in Wiltshire for evaluation and finally going on museum display. It now resides at the Science Museum in London. Immelmann's original E.I, with IdFlieg-issued serial E.13/15, also survived the war and went on display in Dresden where it was destroyed by Allied bombing during World War II.

Specifications (E.III)

Data from German Aircraft of the First World War[5]

General characteristics

Performance

See also

References

Notes
  1. ^ a b Dierikx 1997, p. 31.
  2. ^ a b Boyne 1988
  3. ^ vanWyngarden 2006, p. 9.
  4. ^ Grosz 2002, pp. 6–8.
  5. ^ Gray, Peter; Owen Thetford (1970). German Aircraft of the First World War (2nd ed.). London: Putnam & Company Ltd.. pp. 109–112. ISBN 0-370-00103-6. 
Bibliography
  • 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.
  • Grosz, Peter M. Fokker E III (Windsock Datafile No. 15). Berkhamsted, Herts, UK: Albatros Publications, 1989. ISBN 0-948414-19-7.
  • 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 Publishing Ltd, 2006. ISBN 1-84176-997-5.

External links