O.Thetford, P.Gray German Aircraft of the First World War (Putnam)
This two-seat machine was designed by Steffen and built during 1915 for unarmed tactical reconnaissance. A novel feature in construction was the use of tubular steel wing spars. The aircraft was delivered to the Brieftauben Abteilungen at Ostend at the express request of the Commanding Officer, where it crashed. Usable parts were shipped back to the S.S.W. factory and subsequently used in construction of the E II. Engine, 100 h.p. Siemens-Halske Sh I. Span, 12.4 m. (40 ft. 8 1/4 in.). Length, 6.2 m. (20 ft. 4 3/8 in.). Speed achieved on test, 153 km.hr. (95.625 m.p.h.).