The Fokker E.II was the second variant of the GermanFokker Eindecker single-seat monoplane fighter aircraft of World War I. The E.II was essentially a Fokker E.I with the 75 kW (100 hp) Oberursel U.I 9-cylinder rotary engine, a close copy of the French Gnôme Monosoupape rotary of the same power output, in place of the E.I's 60 kW (80 hp) Oberursel U.0, but whereas the E.I was simply a M.5K with a 7.92 mm (.312 in) machine gun bolted to it, the E.II was designed with the weapon system integrated with its airframe.
Fokker E.II/35 from Feldflieger Abteilung 14 preparing to land on the Eastern Front.
On 13 June 1915, Anthony Fokker demonstrated the first E.II to an audience of German commanders, including Crown Prince Wilhelm of Germany, at a German Fifth Army airfield. On 23 and 24 June he demonstrated the aircraft at Douai to the German Sixth Army. It was during these demonstrations, only one week before any kills would be achieved in the Eindecker type, that Fokker himself attempted to engage an enemy aircraft but he was unable to find a target.
The major difference between the types was a reduced wingspan on the E.II, intended to increase speed, but handling and climbing performance suffered. The type was therefore quickly superseded by the E.III. The E.II also had a larger fuel capacity of 90 litres (23.75 US gallons) to supply the Oberursel U.I's 54 litres/hour fuel consumption, as compared to the E.I's 69 litres (18.2 US gallons) capacity to feed its earlier U.0 rotary, which used 37 litres/hour of fuel.[1] As with the M.5K/MG quintet of production prototype Eindeckers, the pilot was provided with a head support to help him resist the airstream when he had to raise his head to use the gun sights.
Max Immelmann's Fokker E.II in late October 1915, showing the initial form of soffit surface that the larger Oberursel U.I nine-cylinder rotary engine and larger diameter cowl required.
The heavier weight of the 75 kW (100 hp) Oberursel U.I rotary engine used to power the E.II necessitated both a somewhat lengthened rear fuselage structure, in comparison to the E.I version to achieve proper balance, with the U.I engine's larger diameter requiring a larger radius "horseshoe" pattern cowl to enclose it, and the aluminum upper deck of the nose was raised along with it - resulting in metal soffits having to be fitted where the upper deck met the upper longerons, with additional structural metal tubing additions to the forward ends of the upper longerons immediately behind the firewall to support the "soffits" and sides of the raised upper nose panel. This format was continued with the E.III.
The E.II was built in parallel with the E.I and the choice of whether an airframe became an E.I or E.II depended on the availability of engines. In total, Fokker production figures state that 49 E.IIs were built and 45 of these had been delivered to the Western FrontFliegertruppe by December 1915 (Luftstreitkräfte from October 1916 onwards) at which time production switched to the main Eindecker variant, the Fokker E.III, which used the same 75 kW (100 hp) Oberursel U.I engine. Some E.IIs under production were completed as E.IIIs and numerous E.IIs returned to Fokker's factory for repair were upgraded to E.III specification.
Grosz, Peter M. Fokker E I/II (Windsock Datafile No. 91). Berkhamsted, Herts, UK: Albatros Publications, 2002. ISBN1-902207-46-7.
Jarrett, Philip. "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. ISBN978-1-84176-997-4.
Winchester, Jim. Fighter: The World's Finest Combat Aircraft - 1913 to the Present Day. New York: Barnes & Noble Publishing, Inc. and Parragon Publishing, 2006. ISBN0-7607-7957-0.
May 03, 2024
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The Fokker E II was the second variant of the German Fokker Eindecker single seat monoplane fighter aircraft of World War I The E II was essentially a Fokker E I with the 75 kW 100 hp Oberursel U I 9 cylinder rotary engine a close copy of the French Gnome Monosoupape rotary of the same power output in place of the E I s 60 kW 80 hp Oberursel U 0 but whereas the E I was simply a M 5K with a 7 92 mm 312 in machine gun bolted to it the E II was designed with the weapon system integrated with its airframe E II Role Fighter Manufacturer Fokker Flugzeugwerke Designer Anthony Fokker First flight 13 June 1915 Introduction June 1915 Primary user Luftstreitkrafte Produced 1915 Number built 49 Variants Fokker E I Fokker E III Contents 1 Design and development 2 Operators 3 Specifications E II 4 See also 5 Citations 6 BibliographyDesign and development edit nbsp nbsp Fokker E II 35 from Feldflieger Abteilung 14 preparing to land on the Eastern Front On 13 June 1915 Anthony Fokker demonstrated the first E II to an audience of German commanders including Crown Prince Wilhelm of Germany at a German Fifth Army airfield On 23 and 24 June he demonstrated the aircraft at Douai to the German Sixth Army It was during these demonstrations only one week before any kills would be achieved in the Eindecker type that Fokker himself attempted to engage an enemy aircraft but he was unable to find a target The major difference between the types was a reduced wingspan on the E II intended to increase speed but handling and climbing performance suffered The type was therefore quickly superseded by the E III The E II also had a larger fuel capacity of 90 litres 23 75 US gallons to supply the Oberursel U I s 54 litres hour fuel consumption as compared to the E I s 69 litres 18 2 US gallons capacity to feed its earlier U 0 rotary which used 37 litres hour of fuel 1 As with the M 5K MG quintet of production prototype Eindeckers the pilot was provided with a head support to help him resist the airstream when he had to raise his head to use the gun sights nbsp Max Immelmann s Fokker E II in late October 1915 showing the initial form of soffit surface that the larger Oberursel U I nine cylinder rotary engine and larger diameter cowl required The heavier weight of the 75 kW 100 hp Oberursel U I rotary engine used to power the E II necessitated both a somewhat lengthened rear fuselage structure in comparison to the E I version to achieve proper balance with the U I engine s larger diameter requiring a larger radius horseshoe pattern cowl to enclose it and the aluminum upper deck of the nose was raised along with it resulting in metal soffits having to be fitted where the upper deck met the upper longerons with additional structural metal tubing additions to the forward ends of the upper longerons immediately behind the firewall to support the soffits and sides of the raised upper nose panel This format was continued with the E III The E II was built in parallel with the E I and the choice of whether an airframe became an E I or E II depended on the availability of engines In total Fokker production figures state that 49 E IIs were built and 45 of these had been delivered to the Western Front Fliegertruppe by December 1915 Luftstreitkrafte from October 1916 onwards at which time production switched to the main Eindecker variant the Fokker E III which used the same 75 kW 100 hp Oberursel U I engine Some E IIs under production were completed as E IIIs and numerous E IIs returned to Fokker s factory for repair were upgraded to E III specification Operators edit nbsp German EmpireSpecifications E II editGeneral characteristics Crew 1 Length 7 2 m 23 ft 7 in Wingspan 9 7 m 31 ft 10 in Height 2 8 m 9 ft 2 in Wing area 16 m2 170 sq ft Empty weight 340 kg 750 lb Gross weight 500 kg 1 102 lb Powerplant 1 Oberursel U I 9 cyl air cooled rotary engine 75 kW 101 hp Performance Maximum speed 140 km h 87 mph 76 kn Armament Guns 1 forward firing 7 92 mm 312 in Maschinengewehr 08 machine gunSee also editRelated development Fokker E I Fokker E III Related lists List of military aircraft of GermanyCitations edit Grosz Peter M Windsock Datafile No 91 Fokker E I II Albatros Publications Ltd 2002 pg 21 ISBN No 1 902207 46 7 Bibliography edit nbsp Wikimedia Commons has media related to Fokker E II 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 Philip 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 amp Noble Publishing Inc and Parragon Publishing 2006 ISBN 0 7607 7957 0 Retrieved from https en wikipedia org w index php title Fokker E II amp oldid 1198458527, wikipedia, wiki, book, books, library,
