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

Gotha WD 9
  Appearing in February 1916, the WD 9 was largely a development of the WD 5. Only a single machine (fitted with a 160 h.p. Mercedes D III) was supplied to the German Navy. However, several aircraft (with the 150 h.p. Benz) were supplied to the Turkish Government. Engine, 160 h.p. Mercedes D III. Span, 15.0 m. (49 ft. 2 5/8 in.). Length, 9.8 m. (32 ft. 1 7/8 in.) Height, 3.8 m. (12 ft. 5 5/8 in.). Area, 51.3 sq.m. (554 sq.ft.). Weights: Empty, 1,040 kg. (2,288 lb.). Loaded, 1,490 kg. (3,278 lb.). Speed, 136 km.hr. (85 m.p.h.). Climb, 1,000 m. (3,280 ft.) in 10 min. Duration, 3 1/2 hr. Armament, one manually operated Parabellum machine-gun in rear cockpit.