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LFG Roland D.XIII/D.XV

Страна: Германия

Год: 1918

Fighter

LFG Roland - D.VII - 1918 - Германия<– –>LFG Roland - D.XVI - 1918 - Германия


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


L.F.G. Roland D XIII
  Next in the long series of Roland prototypes was the D XIII serialled 3002/18, there being no record of D X, XI or XII. This was little more than the second version of the D VII with a 195 h.p. Korting vee-eight engine with reduction gearing. Span, 9 0 m. (29 ft. 6 3/8 in.). Area, 23 sq.m. (248 sq.ft.). Armament, twin Spandau machine-guns.

L.F.G. Roland D XV (first version)
  As the first of four D XV prototypes, No. 3004/18 still perpetuated the use of clinker-built fuselage first used on the D IV. The wings had no bracing cables and considerably more stagger than any of the previous prototypes which probably improved forward and downward visibility from the cockpit, but omission of centre-section cut-out could not have given very good upward and forward field of view. Engine, 160 h.p. Mercedes D III. Span, 8.64 m. (28 ft. 4 1/4 in.). Area, 23.8 sq.m. (257 sq.ft.). Weights: Empty, 730 kg. (1,606 lb.). Loaded, 910 kg. (2,002 lb.). Armament, twin Spandau machine-guns.

L.F.G. Roland D XV (second version)
  The second D XV prototype. No. 3006/18, was basically a D VI airframe with a new wing cellule braced solely with single I-struts, no cables being used. The top wing was of greater chord while the chord of the lower wing was considerably reduced. This was the last of the Roland fighter series to feature the clinker-planked fuselage. Engine, 180 h.p. Mercedes D IIIa. Span, 9.0 m. (29 ft. 6 3/8 in.). Area, 23 sq.m. (248 sq.ft.). Armament, twin Spandau machine-guns.

L.F.G. Roland D XV (third version)
  The third and fourth versions of the D XV were alike except for engine installation. In construction they were very different to their precursors, slab-sided plywood-covered fuselages being used and the wings braced with tubular steel "N" struts. There were no flying or landing wires bracing the wing cellule. This model is said to have been a copy of the Fokker D VII, which may or may not be true. Certainly it was no slavish although a certain similarity of outline must be admitted. Engine, 185 h.p. B.M.W. III (third version), 200 h.p. Benz Bz IIIa V (fourth version). Armament, twin Spandau machine-guns.


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


LFG ROLAND D XIII Germany

In March 1918, after the experimental 195 hp Korting Kg III eight-cylinder water-cooled Vee-type engine had completed a 24-hour duration test, an example of this power plant fitted with reduction gear was delivered to the Luft-Fahrzeug Gesellschaft for installation in the prototype of a new single-seat fighter, the D XIII. Based on the D VII and ordered in April 1918, the D XIII entered flight test in May 1918, but crankshaft cooling proved inadequate and difficulties were experienced with the oil system. In July, the Kg III engine was removed from the prototype and returned to the manufacturer for modification. It was destined not to be re-installed, however, as the D XIII was one of 10 prototypes destroyed in a hangar fire on 25 July 1918. The D XIII was fitted with two synchronised LMG 08/15 machine guns. No performance data were recorded.

Span, 29 ft 6 1/3 in (9,00 m).
Wing area, 247.58 sq ft (23,00 m2).


LFG ROLAND D XV Germany

  Three prototypes of the D XV were ordered in April 1918, the original intention being to fit each aircraft with a different engine for comparison purposes. The D XV perpetuated the use of the Klinkerrumpf (clinker-built) fuselage first used on the D IV. The wing cellule was of the "wireless” type, having no bracing cables, and featured appreciably more stagger than that of any preceding LFG fighter. The first D XV was powered by a 160 hp Mercedes D IIIa engine and was completed before the end of April, but flight testing was interrupted in May by the decision to return the prototype to the factory for modifications. A second, similarly-powered, D XV appeared in June 1918, the principal changes being replacement of the paired interplane struts by single I-type struts and the introduction of overhanging ailerons on the upper wing. This prototype was flight tested with both the Mercedes engine and a 185 hp BMW IIIa, demonstrating a good turn of speed, but proving deficient in climb rate. In September 1918, Idflieg demanded further modifications in the light of the trials conducted with the first two prototypes. Instead, the LFG designed a completely new fighter which retained the D XV designation. The following data relate to the initial version of the D XV with the Mercedes D IIIa engine.

Empty weight, 1,609 lb (730 kg).
Loaded weight, 2,006 lb (910 kg).
Span, 28 ft 4 1/8 in (8,64 m).
Wing area, 256.19 sqft (23,80 m2).


LFG ROLAND D XV (II) Germany

  Rather than introduce the modifications in the D XV demanded by Idflieg, LFG produced an entirely new fighter bearing no relationship to its predecessor, but, nevertheless, retaining the D XV designation. Bearing a strong similarity to the Fokker D VII and claimed by some to be no more than an unauthorised copy of that fighter, the new D XV was of different construction. The clinker-built fuselage gave place to one of rectangular cross section with plywood skinning, tubular steel N-type interplane bracing struts were employed and two prototypes were built. The first of these appeared late in October 1918 with a 185 hp BMW IIIa engine, and the second was rolled out shortly afterwards with a 200 hp Benz Bz nia. Neither prototype participated in the 3rd D-type contest, and further development was halted by the Armistice. No data relating to the second D XV design are available.


J. Herris Roland Aircraft of WWI (A Centennial Perspective on Great War Airplanes 9)


Roland D.XIII

  The next Roland fighter built was the D.XIII, the D.X through D.XII remaining unbuilt projects. Based on the D.VII and ordered in April 1918, the D.XIII, 3002/18, used the prototype 195 hp Korting Kg.III V-8 engine. Armed with the standard two synchronized LMG 08/15 machine guns, the D.XIII entered flight testing in May 1918. The experimental engine was not sufficiently developed and problems resulted in its removal from the D.XIII in July 1918 and it was returned to the factory for modification. The engine was not reinstalled because the D.XIII prototype was one of ten prototypes destroyed in a hangar fire on 25 July 1918.

Roland D.XIII Specifications
Engine: 195 hp Korting Kg.III V-8
Wing: Span 9.00m
Area 23.00 m2


Roland D.XV

  Three Roland D.XV prototypes were ordered in April 1918 with the intention of fitting each with a different engine for comparison. Armament was the standard two synchronized LMG 08/15 machine guns and the first two prototypes used the familiar Klinkerrumpf fuselage construction. The wing cellule had no bracing cables and featured more stagger than previous Roland designs.
  The first prototype was powered by the 170 hp Mercedes D.IIIa engine and was completed before the end of April. In May flight testing was interrupted to return the prototype to LFG for modifications. A second prototype, similarly powered, appeared in July 1918; the major changes were replacement of the paired interplane struts by single I-struts and introduction of overhanging ailerons. This second prototype was tested with both the 170 hp Mercedes D.IIIa and 185 hp BMW.IIIa engines. With both engines the D.XV was fast but had a mediocre climb rate.
  Based on the results of trials of the first two prototypes, Idflieg demanded further modifications in September 1918. Rather than make the modifications, LFG designed and built a completely new fighter that retained the D.XV designation.
  The next prototype D.XV, actually a totally new design, had a very strong similarity to the Fokker D.VII. Considering the success of the Fokker D.VII, this should not have been surprising. The new design, two of which were built, abandoned the Klinkerrumpf fuselage construction for a rectangular fuselage skinned with plywood. N-struts were used for interplane bracing. The first 'new' D.XV flew in late October with a 185 hp BMW.IIIa engine. The second example appeared soon after with a 200 hp Benz Bz.IIIa. Neither was in time to participate in the Third Fighter Competition, and the Armistice halted further development.

Roland D.XV Specifications (First Prototype)
Engine: 170 hp Mercedes D.IIIa
Wing: Span 8.64 m
Area 23.80 m2
General: Empty Weight 730 kg
Loaded Weight 910 kg

W.Green, G.Swanborough - The Complete Book of Fighters
Based on the D VII, the single D XIII had the experimental Korting Vee-type engine.
J.Herris - Roland Aircraft of WWI /Centennial Perspective/
The Roland D.XIII fighter prototype was similar to the earlier D.VI, D.VII, and D.VIII prototypes, but used the experimental 195 hp Korting Kg.III V-8. Failure of this engine doomed the Roland D.XIII.
J.Herris - Roland Aircraft of WWI /Centennial Perspective/
The Roland D.XIII fighter prototype was similar to the earlier D.VI, D.VII, and D.VIII prototypes, but used a different engine, the experimental 195 hp Korting Kg.III V-8.This engine failed to reach production, dooming the D.XIII.
J.Herris - Roland Aircraft of WWI /Centennial Perspective/
O.Thetford, P.Gray - German Aircraft of the First World War /Putnam/
L.F.G. Roland D XIII
J.Herris - Roland Aircraft of WWI /Centennial Perspective/
The first Roland D.XV prototype, 3004/18, was powered by a production 170 hp Mercedes D.IIIa engine. It used the Klinkerrumpf fuselage construction, had parallel interplane struts, and was clearly related to the production D.VIa.
J.Herris - Roland Aircraft of WWI /Centennial Perspective/
Additional view of the first Roland D.XV prototype, 3004/18, which was powered by a production 170 hp Mercedes D.IIIa engine. Its Klinkerrumpf fuselage construction and overall design was clearly similar to the Roland D.VIa already in production; the key difference is that the D.XV eliminated bracing wires and their associated drag.
J.Herris - Roland Aircraft of WWI /Centennial Perspective/
L.F.G. Roland D XV (first version)
J.Herris - Roland Aircraft of WWI /Centennial Perspective/
L.F.G. Roland D XV (first version)
J.Herris - Roland Aircraft of WWI /Centennial Perspective/
The second Roland D.XV prototype, 3006/18, was the 2,000th aircraft built by Roland and was painted to celebrate this achievement. Appearing in June 1918, the second prototype had single-bay I-struts but was otherwise similar to the first prototype. It was tested with both a production 170 hp Mercedes D.IIIa engine and a 185 hp BMW.IIIa. It was fairly fast but had insufficient climb rate, and as a result, in September 1918 Idflieg demanded still further modifications to the prototypes.
J.Herris - Roland Aircraft of WWI /Centennial Perspective/
O.Thetford, P.Gray - German Aircraft of the First World War /Putnam/
L.F.G. Roland D XV (second version)
J.Herris - Roland Aircraft of WWI /Centennial Perspective/
Another view of the second Roland D.XV prototype, 3006/18. Tested with both a 170 hp Mercedes D.IIIa engine and a 185 hp BMW.IIIa engine, it was fairly fast but its climb rate was not sufficient. The distinctive radiator design and location differ from previous Roland practice.
J.Herris - Roland Aircraft of WWI /Centennial Perspective/
Jane's All The World Aircraft 1919 /Jane's/
An Experimental Roland Type D.XV Single-seater Biplane. (160 h.p. Mercedes engine.) This machine was the 2,000th aircraft turned out by the Roland factory.
J.Herris - Roland Aircraft of WWI /Centennial Perspective/
Retaining the D XV designation, a wholly new design was produced late in 1918.
J.Herris - Roland Aircraft of WWI /Centennial Perspective/
The third Roland D.XV prototype was a completely new design that abandoned Roland's Klinkerrumpf fuselage construction in favor of a plywood fuselage. It retained the distinctive radiator design and location introduced on the previous Roland D.XV prototypes; other than the radiator it closely resembled the reigning Fokker D.VII.
J.Herris - Roland Aircraft of WWI /Centennial Perspective/
The completely new third Roland D.XV prototype closely resembled the dominant Fokker D.VII, which was certainly not a coincidence. The fact that Roland ignored Idflieg demands to continue modifications to the first two D.XV prototypes may have been due to Roland's realization that neither prototype could compete with the Fokker D.VII regardless of modifications. Two new 'D.XV' aircraft were built, the first was rolled out in late October and was powered by a 185 hp BMW.IIIa.The second was completed soon after and was powered by a 200 hp Benz Bz.IIIa. Neither prototype was in time for the Third Fighter Competition and the Armistice halted further development.
Jane's All The World Aircraft 1919 /Jane's/
A Roland Single-seater "Wireless" Biplane. Type D.XV in third prototype form. (190 h.p. B.M.W. engine.)
J.Herris - Roland Aircraft of WWI /Centennial Perspective/
L.F.G. Roland D XV (fourth version)
J.Herris - Roland Aircraft of WWI /Centennial Perspective/
Roland D.XV/3
J.Herris - Roland Aircraft of WWI /Centennial Perspective/
Roland D.XV/3