O.Thetford, P.Gray German Aircraft of the First World War (Putnam)
Gotha WD 27
Designed for long-range patrol and bombing duties, three of these colossal machines were built during 1918, Nos. 4326-4328. They truly came into the Rs category (Riesen-Seeflugzeug, Giant Seaplane), and were powered by four 160 h.p. Mercedes D III engines mounted tandem fashion in twin nacelles, driving neatly spinnered tractor and pusher airscrews. Span, 31.0 m. (101 ft. 8 5/8 in.). Length, 17.6 m. (57 ft. 9 in.). Area, 193 sq.m. (2,084 sq.ft.). Weights: Empty, 4,500 kg. (9,900 lb.). Loaded, 6,690 kg. (14,718 lb.). Speed, 135 km.hr. (84.35 m.p.h.).