O.Thetford, P.Gray German Aircraft of the First World War (Putnam)
L.F.G. Roland D IV
Built in 1917, this elegant triplane was the first L.F.G. single-seater to feature the clinker-built fuselage which is described in the main text under L.F.G. D VIb. All control surfaces were unbalanced, and ailerons were fitted to both upper and lower wings. The tailplane was adjustable for incidence, but not during flight. Engine, 160 h.p. Mercedes D III.
W.Green, G.Swanborough The Complete Book of Fighters
LFG ROLAND D IV (DR I) Germany
The DIV single-seat fighter triplane of mid-1917 marked a noteworthy departure from previous LFG structural methods in that the Wickelrumpf that had characterised all previous aircraft gave place to the so-called Klinkeirumpf - clinker-built or lapstrake construction utilising the planking methods commonly employed in the construction of small boat hulls. Strips of spruce overlapped one another by some two-thirds over a light framework of stringers and formers. This method of construction was less time-consuming than the Wickelrumpf and comparably robust. The D IV - later to be redesignated Dr I when the "Dr” prefix was adopted for triplanes - was powered by a 160 hp Mercedes D III water-cooled engine and carried the usual armament of twin synchronised 7,9-mm LMG 08/15 machine guns. A single prototype was ordered by the Idflieg for evaluation, but this crashed at the end of September 1917. It was promptly rebuilt utilising a D VI fuselage, but subsequent testing revealed no particularly outstanding characteristics and further development was discontinued.
Max speed, 96 mph (155 km/h).
Service ceiling, 19,685 ft (6 000 m).
Empty weight, 2,050 lb (930 kg).
Loaded weight, 2,665 lb (1208 kg).
Span, 31ft 0 in (9,45 m).
Length, 24 ft 0 in (7,32 m).