O.Thetford, P.Gray German Aircraft of the First World War (Putnam)
L.F.G. Roland D IX (first version)
The first of three D IX prototypes, No. 3001/18, was fitted with 160 h.p. Siemens-Halske Sh III geared rotary engine. It competed in the second D types Competition in the summer of 1918. Span, 8.92 m. (29 ft. 3 1/8 in.). Area, 18.48 sq.m. (199.5 sq.ft.). Weights: Empty, 534 kg. (1,175 lb.). Loaded, 754 kg. (1,658 lb.). Climb, 5,000 m. (16,400 ft.) in 16.4 min., 6,000 m. (16,680 ft.) in 23 min. Armament, twin Spandau machine-guns.
L.F.G. Roland D IX (second version)
Differing from the first prototype, this second machine had much larger tail surfaces and unbalanced ailerons. Engine now installed was 210 h.p. Siemens-Halske IIIa. Armament, twin Spandau machine-guns.
L.F.G. Roland D IX (third version)
This third, and final, D IX prototype differed from the second machine in having a large horn-balanced rudder and overhung, balanced ailerons as on the first prototype. Engine, 210 h.p. Siemens-Halske IIIa geared rotary. Armament, twin Spandau machine-guns.
L.F.G. Roland D XIV
Powered with the 170 h.p. Goebel Goe IIIa eleven-cylinder rotary engine, the D XIV (No. 3003/18) was a development of the D IX. Span, 9.0 m. (29 ft. 6 3/8 in.). Area, 23 sq.m. (248 sq.ft.). Armament, twin Spandau machine-guns.
W.Green, G.Swanborough The Complete Book of Fighters
LFG ROLAND D IX Germany
With the advent of more powerful rotary engines in the spring of 1918, Idflieg supported the development of compatible fighters, one such being the D IX powered by the new 160 hp Siemens-Halske Sh III rotary. The first D IX prototype demonstrated excellent performance at the 1st D-type contest in January 1918, before being destroyed as a result of a freak accident. While the D IX was in flight, the pilot’s seat collapsed, its occupant inadvertently pulling the aircraft into a tight loop in which the resultant g forces propelled him through the bottom of the fuselage before the aircraft broke up. At the time, two more prototypes were in assembly, the first of these being successfully load-tested in April prior to resumption of flight testing. The second D IX differed in having enlarged tail surfaces and unbalanced ailerons. Armament comprised twin synchronised 7,9-mm LMG 08/15 machine guns. It appeared in the 2nd D-type contest in May, but, according to the debriefing minutes, was considered unsuited for series production. The third D IX had been completed meanwhile with overhung, unbalanced ailerons and a larger horn-balanced rudder.
Max speed, 115 mph (185 km/h).
Time to 16,405 ft (5 000 m), 16.4 min.
Endurance, 1.5 hrs.
Empty weight, 1,177 lb (534 kg).
Loaded weight, 1,596 lb (724 kg).
Span, 29 ft 3 1/4 in (8,92m).
Length, 19 ft 4 1/4 in (5,90m).
Height, 9 ft 0 in (2,75 m).
Wing area, 198.92 sq ft (18,48 m2).
LFG ROLAND D XIV Germany
Essentially similar to the D XIII, the D XIV was ordered by Idflieg in April 1918 to evaluate the new Goebel Goe III 11-cylinder rotary engine of 160 hp. Fitted with the standard twin 7,9-mm LMG 08/15 gun armament, the prototype D XIV was completed in time to participate in the 2nd D-type contest in May 1918. Flying was strictly limited by the recalcitrant engine, and this, in accordance with competition protocol, eliminated the D XIV from further consideration as a production type. No data relating to the D XIV are available.