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Zeppelin-Lindau (Dornier) D.I

Страна: Германия

Год: 1918


Zeppelin-Lindau (Dornier) - CS.I - 1918 - Германия<– –>Zeppelin-Lindau (Dornier) - R-projects - 1918 - Германия

O.Thetford, P.Gray German Aircraft of the First World War (Putnam)

Zeppelin-Lindau (Dornier) D I
  This single-seat fighter was another of Claude Dornier's research essays, this time into the realm of cantilever-wing construction. About two-thirds of the wings were aluminium sheet-covered, over alloy ribs and spars, forming a torsion-box structure. The remainder of the wings, from the rear spar to trailing edge, were fabric-covered, as were also the unbalanced ailerons. The fuselage was an all-metal, stressed-skin assembly, incorporating the vertical fin, all other tail surfaces being fabric-covered. Other unique features were the - apparent - single-leg undercarriage and the streamlined jettisonable fuel tank slung underneath the fuselage.
  Although not listed in the official list of types participating in the second D types Competition at Adlershof in the summer of 1918, the Zeppelin D I was among several other types submitted for evaluation by Front Line pilots, as an adjunct to the D Competition. The machine was then fitted with Mercedes D III engine, and when being flown by Oblt. Reinhard in July 1918 it shed a top wing with fatal results. Another aircraft, with B.M.W. engine installed, competed in the third D types Competition (which was for B.M.W.-powered aircraft only). Performance was disappointing, and in speed the Zeppelin fighter was surpassed by seven other types. Bongartz' succinct report said: "Does not possess characteristics of a modern fighter. Ailerons too heavy."
  Engine: 185 h.p. B.M.W. IIIa. Span, 7.8 m. (25 ft. 7 1/8 in.). Length, 6.37 m. (20 ft. 11 in.). Area, 18.7 sq.m. (202 sq.ft.). Weights: Empty, 710 kg. (1,562 lb.). Loaded, 890 kg. (1,958 lb.). Armament, twin Spandau machine-guns.
  N.B. Two Zeppelin D Is were taken to the U.S.A. after the war and evaluated by the Army and Navy respectively.

W.Green, G.Swanborough The Complete Book of Fighters


  The D I single-seat fighter biplane created by the Abteilung ‘‘Dornier” in 1918 at the Lindau-Reutin plant was of all-metal construction with stressed fuselage skinning and cantilever wings of torsion-box construction, and carried a jettisonable fuel tank beneath the fuselage - features well ahead of the contemporary state of the art. Powered by a 160 hp Mercedes D IIIa engine, the first prototype flew on 4 June 1918, but shed the upper wing during flight testing in the following month, apparently justifying the caution with which the innovatory Dornier fighter was viewed by the Inspektion der Fliegertruppen (Idflieg). Nevertheless, two further prototypes powered by the 185 hp BMW IIIa engine were completed, with strengthened wing bracing and attachments. One of these participated in the third D-Type contest, but displayed a disappointing performance. The D I carried twin synchronised 7,92-mm machine guns. Although no production was ordered, three additional examples were completed (two with the Mercedes and one with the BMW engine), two of these being taken to the USA for evaluation after the Armistice. The data relate to the BMW IIIa-engined model.

Max speed, 124 mph (200 km/h) at sea level.
Time to 3,280 ft (1000 m), 2.6 min.
Range, 168 mis (270 km).
Empty weight, 1,598 lb (725 kg).
Loaded weight, 1,947 lb (883 kg).
Span, 25 ft 7 in (7.80 m).
Length, 20 ft 11 9/10 in (6,40 m).
Height, 8 ft 6 1/3 in (2,60 m).
Wing area, 200.86 sq ft (18,66 m2).

R.Kosin - The German Fighter since 1915 /Putnam/
Despite carrying the Zeppelin-Lindau name, the division headed by Claudius Dornier the D.I, first flown on 4 June 1918, was designed by Adolph Rohrbach, head of the Zeppelin-Staaken division. Like its few Zeppelin-Lindau forebears, this latest single seat, biplane fighter used light alloy as its primary structural material. Externally, the 185hp BMW IIIa powered D.I was an exceptionally clean design, with fully cantilevered wings and tail unit, bereft of any external and, hence, drag-producing bracing struts or wires. Rushed through the design and assembly phases in order to compete in the second 1918 Adlershof fighter competitions, the disassembled D.I was dispatched by train immediately after its maiden flight. Reportedly, while still in transit, someone re-checking at the factory discovered that the upper wing attachment fittings were too weak and alerted Adlershof not to fly the aircraft until strengthened fittings could be rushed to them. Sadly, whether the information was not received, or simply ignored, the D.I was flown twice after re-assembly, Hermann Goring being the first service pilot to fly it, followed by Hptm Wilhelm Reinhardt, who lost his life after the upper wing detached in mid-air. At least two other D.Is were built, as two found their way to the US soon after the war, to be tested by the US Army and Navy, respectively. Earlier German testing had been critical of the aircraft's lack of speed, said to be 124mph at sea level, and general heaviness of the controls.
O.Thetford, P.Gray - German Aircraft of the First World War /Putnam/
A 1918 Zeppelin D.I All-metal Wireless Scout. One 185 h.p. BMW IIIa engine.
J.Herris - Development of German Warplanes in WWI /Centennial Perspective/
An all-metal Zeppelin D.I is shown during evaluation in the US after the war. The aircraft is very streamlined; the shape under the fuselage is the fuel tank. During evaluation of a prototype in July 1918, Lt. Reinhard, an ace with JG I, was killed when the upper wing tore off the aircraft during high-G maneuvers.
R.Kosin - The German Fighter since 1915 /Putnam/
Zeppelin (Dornier) D I fuselage structure.
R.Kosin - The German Fighter since 1915 /Putnam/
Zeppelin (Dornier) D I upper wing structure.
W.Green, G.Swanborough - The Complete Book of Fighters
Two of the four examples of the D I were taken to the USA for evaluation.
R.Kosin - The German Fighter since 1915 /Putnam/
Dornier Do D.I