O.Thetford, P.Gray German Aircraft of the First World War (Putnam)
Siemens-Schuckert L I (G III)
Of unusual twin-fuselage format, the design of this machine was commissioned by Idflieg early in 1918 to be based upon the successful designs of the Italian Caproni bombers. Originally the designation was G III (G I and G II were projects only), but was later changed to L I, a completely new classification falling between the G and R categories. Three machines were completed, but saw no operational service. Two engines were mounted tractor fashion in the twin fuselages, the third engine driving a pusher airscrew at the rear of the central nacelle. There were gun positions in both fuselages aft of the wings and another position in the nose of the nacelle. Engines, three 240 h.p. Maybach Mb IV. Span, 32 m. (105 ft. 0 in.). Length, 14.65 m. (47 ft. 2 3/4 in.). Area, 169 sq.m. (1,825 sq.ft.). Weights: Empty, 4,400 kg. (9,680 lb.). Loaded, 6,400 kg. (14,080 lb.). Speed, 125 km.hr. (78.125 m.p.h.). Duration, 5 1/2 hr. Armament, three Parabellum machine-guns.