Fokker Dr.I

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Fokker Dr. I

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Single-seat fighter and reconnaissance plane

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Powerplant

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One Oberursel Ur. II rotary piston engine

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Dimensions

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Length5.77 m

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Wingspan7.20 m

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Height2.95 m

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Wing area18.70 m²

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Weights

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Empty406 kg

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Maximum take-off585 kg

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Performance

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Maximum speed165 km/h

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Operative rangeunknown

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Service ceiling6095 m

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Armament

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Machine gunstwo, fixed

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The Fokker Dr.I Dreidecker was a World War I fighter aircraft built by the company of Anthony Fokker, used by Germany. It became most famous as the plane of the Red Baron, Manfred von Richthofen. Although classified as a triplane, it had another wing in between the wheels to increase lift

Related Topics:
World War I - Fighter aircraft - Anthony Fokker - Germany - Manfred von Richthofen

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The Dr.I was mainly designed by Anthony Fokker and Reinhold Platz (although Chefingenieur Möser has been credited with a role), who had been working on a series of experimental planes, the V-series, since 1916. They shared one feature in common, the use of cantilever wings instead of external wire bracing. This led to significantly lower drag, but it also required stronger internal structures in the wing, reducing the advantage. In order to address this, his V.3 design had used three shorter wings instead of two wider ones, so that the loads on any particular wing were reduced and would require less internal structure. In testing, the wings tended to vibrate, so the design was modified with single struts between the wings at the tips, leading to the V.4.

Related Topics:
Anthony Fokker - Reinhold Platz - 1916 - Cantilever

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In testing the V.4?which had a doped fabric-covered tubular steel fuselage and tail and wooden wings?proved to be something of a disappointment. Although the handling was fairly good due to the low angular momentum of the short wings, several modifications were made to improve it, notably the control feel. The main concern was the speed, however: the added wing made the drag high enough that the puny 110hp Oberursel UR.II engine could not drive it to the speeds of then-current Allied aircraft, and Platz introduced a number of V planes with larger engines in an attempt to address this. Platz later turned back to biplane designs for further developments in the V series.

Related Topics:
Angular momentum - Oberursel UR.II - Allied - Biplane

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In April 1917 the Royal Naval Air Service (RNAS) started flying their Sopwith Triplanes on the front-line in force for the first time. Their debut was sensational, for the first time turning the tables completely on the Germans and proving to be almost untouchable in combat. Soon the German pilots were clamouring for a triplane of their own. The majority of the German aircraft manufacturers responded with new triplane designs, but most, like the Albatros Dr.I, were nothing more than biplanes with a new wing added. The V.4 however was a purpose-built triplane, well tested and ready for production. Fokker had another advantage?he had arranged for the first Sopwith to be brought down to be shipped to his factory. Unsurprisingly, Fokker's design won the contract. The first pre-production examples (F.Is) were ready by the middle of August 1917 and production machines (Dr.Is) were delivered in October of the same year.

Related Topics:
1917 - Royal Naval Air Service - Sopwith - Triplanes - Triplane - Albatros Dr.I

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Two of the first three F.Is (103/17 and 102/17) were shipped to Werner Voss and Manfred von Richthofen on August 28th, 1917 at Marcke in Belgium. Soon both were flying them in combat and racking up successes, exploiting the aircraft's unique ability to perform flat slip-turns, thanks to the absence of a fixed vertical stabiliser. Triplane 102/17 was shot down whilst being flown by Kurt Wolff on 15 September, and 103/17 flown by Werner Voss on 23 September. However, many of the other pilots were less impressed with the aircraft?while it had good manoeuvrability and an impressive rate of climb, the plane was still slower than most contemporary Allied fighters.

Related Topics:
Werner Voss - Manfred von Richthofen - August 28th - 1917 - Marcke - Belgium - Slip-turn - Kurt Wolff - 15 September - 23 September

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In late October 1917 Leutnants Heinrich Gontermann and Günther Pastor were killed when their Dr.Is broke up in the air at the end of October, and the planes were withdrawn from service. Modifications were then made to the wings for added strength, but the failures continued in service and the triplane never recovered in the eyes of the pilots, and was not supplied to many Jagdstaffeln.

Related Topics:
Heinrich Gontermann - Günther Pastor

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The cause of the wing failures was said to be from poor quality control rather than deficiencies in design. However, the failures always occurred in the upper wing of the aircraft. In 1929, National Advisory Committee for Aeronautics (NACA) investigations found that the upper wing carried a higher wing loading than the lower wing?at high speeds it could be 2.55 times as much.

Related Topics:
1929 - National Advisory Committee for Aeronautics

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Manfred von Richthofen flew a variety of Dr.Is, at least one of which (425/17) was completely red, whilst another (152/17) survived until World War II in Berlin.

Related Topics:
Manfred von Richthofen - World War II - Berlin

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Production eventually ended in May 1918, by which time only 320 had been manufactured.

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