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Fokker E.IV

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Fokker E.IV.
Type Fighter
Manufacturer Fokker
Designed by Anthony Fokker
Maiden flight September 1915
Introduced October 1915
Primary user Imperial German Army Air Service
Produced 1915-1916
Number built 49
Variants E.I - E.II - E.III

The Fokker E.IV was the final variant of the Fokker Eindecker fighter aircraft that was operated by Germany during the First World War.

Design and development

Given the Fokker designation of M.15, the E.IV was essentially a lengthened Fokker E.III powered by the 160 hp Oberursel U.III two-row, 14-cylinder rotary engine, a copy of the Gnome Double Lamba. The more powerful engine was intended to enable the Eindecker to carry two or three machine guns, thereby increasing its firepower and providing redundancy if one gun jammed — a common occurrence at the time. However, the E.IV was a troubled design that never achieved the success of its predecessor and was soon out-classed by French and British fighters.[citation needed]

The prototype E.IV was accepted for testing by the German Inspektion der Fliegertruppen in September 1915. It was fitted with three forward-firing Spandau LMG 08 machine guns, mounted to fire upwards at 15 degrees. Anthony Fokker demonstrated the E.IV at Essen but the complicated triple-synchronisation gear failed and the propeller was damaged. The third gun was removed and a simpler double-synchronisation system used which became the standard armament for production E.IVs and indeed for all subsequent German D-type biplane fighters. The angling of the guns was also abandoned.

Operational history

Fokker E.IV with three gun installation.

The modified prototype underwent combat evaluation on the Western Front by Oberleutnant Otto Parschau in October 1915, making it the first twin-gun fighter in service. Leading German ace Oswald Boelcke evaluated the E.IV at Fokker's Schwerin factory in November. The pilots discovered that mounting the much heavier Oberursel U.III onto the Eindecker airframe did not produce a better aircraft — one pilot described it as "practically a flying engine". The inertial and gyroscopic forces of the spinning mass made the E.IV less manoeuvrable than the E.III and any loss of efficiency from the notoriously unreliable engine made the aircraft virtually uncontrollable, requiring the engine to be switched off. Turning under such conditions was exceedingly difficult because the E.IV still used wing warping instead of ailerons. Furthermore, the engine worked well when new, but lost power after only a few hours of operation.

Only 49 E.IVs were built out of the total Eindecker production run of 416 aircraft. Over half of the E.IVs entered service in June 1916 and the last were delivered in December 1916 by which time they were obsolete.


Template:Country data German Empire

Specifications (E.IV)

General characteristics

  • Crew: one, pilot
  • Length: 7.5 m (24 ft 7 in)
  • Wingspan: 10 m (32 ft 9½ in)
  • Height: 2.7 m (9 ft 1 in)
  • Wing area: 15.9 m² (172.2 ft²)
  • Empty weight: 466 kg (1,027 lb)
  • Max takeoff weight: 724 kg (1,596 lb)
  • Powerplant:Oberursel U.III 14-cylinder two-row air-cooled rotary engine, 160 hp (119.3 kW)




See also

Related development
Fokker E.III

Related lists
List of military aircraft of Germany -

Template:Idflieg E-class designations Template:Fokker aircraft

it:Fokker E.IV no:Fokker E.IV

This article is licensed under the GNU Free Documentation License.
It uses material from the Wikipedia article "Fokker E.IV".