O.Thetford, P.Gray German Aircraft of the First World War (Putnam)
Gotha WD 22
To pursue investigation into long-range reconnaissance and patrol duties, two Gotha WD 22s were built during 1918, Nos. 2133 and 2134. They were powered by four engines tandem mounted in twin nacelles; the forward engines driving tractor airscrews were 160 h.p. Mercedes D IIIs, and the rear engines driving pusher airscrews were 100 h.p. Mercedes D I. They were generally similar to the WD 14s. Span, 26.0 m. (85 ft. 3 3/4 in.) Length, 14.4 m. (47 ft. 3 in.). Area, 147 sq.m. (1,588 sq.ft.). Weights. Empty, 3,800 kg. (8,360 lb.). Loaded, 5,170 kg. (11,374 lb.). Speed. 131 km.hr. (82.19 m.p.h.). Armament, manually operated Parabellum machine-guns fore and aft.