Junkers J 11 / CLS I

O.Thetford, P.Gray German Aircraft of the First World War (Putnam)
J.Herris German Seaplane Fighters of WWI (A Centennial Perspective on Great War Airplanes 2)

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

Junkers J 11 (CLS I)
Three machines (Nos. 7501-7503) which were literally seaplane versions of the CL I were delivered to the German Navy during 1918. Apart from the addition of a vertical fin to compensate the additional side area of the floats, the aircraft differed little from its landplane counterpart (apart from the obvious float chassis), although it was marginally larger in dimension. The tail surfaces were never really satisfactory, and after the war a completely new empennage was designed, when the type was used for civil purposes. Engine, 200 h.p. Benz. Span, 12.75 m. (41 ft. 10 in.). Length, 8.95 m. (29 ft. 4 3/8 in.). Height, 2.95 m. (9 ft. 8 1/8 in.). Weights: Empty, 914 kg. (2,011 lb.). Loaded, 1,420 kg. (3,124 lb.). Speed, 180 km.hr. (112.5 m.p.h.). Armament, twin Spandau and one Parabellum machineguns.

J.Herris German Seaplane Fighters of WWI (A Centennial Perspective on Great War Airplanes 2)

Junkers CLS.I

A more serious competitor was the all-metal Junkers with factory designation J11, military designation CLS.I, a floatplane development of the Junkers CL.I two-seat fighter. A fixed fin was added to compensate for the side area of the floats in front of the center of gravity, but insufficient stability required modifications that continued even after the war, when the type was modified for civil use. The all-metal structure resisted the maritime environment better than did wood structures like those of the Brandenburgs, but the type was too late for wartime service.

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	J.Herris - German Seaplane Fighters of WWI /Centennial Perspective/ (2)
	The Junkers J11 was an all-metal two-seat floatplane fighter prototype competing with the Dornier Cs.I and the Brandenburg monoplanes. Powered by a 200 hp Benz Bz.IV, it had a maximum speed of 180 kmh, faster than the Brandenburg W29. Sturdy and durable, it would have been welcomed by maintenance crews. Both Dornier and Junkers were building all-metal monoplanes by the end of the war. There were no Allied all-metal warplanes; Germany clearly led the field in structural design. The all-metal Junkers CLS.I was a floatplane development of the CL.I two-seat fighter. The CL.I was produced for the army and used postwar. The CLS.I was powered by a 200 hp Benz Bz.IV engine.The CLS.I had a top speed of 180 km/h, which was somewhat faster than the W29. The corrugated metal skin was characteristic of early Junkers designs.
	J.Herris - German Seaplane Fighters of WWI /Centennial Perspective/ (2)
	Marine #7501 was a floatplane adaption of the all-metal Junkers CL.I two-seat fighter. The CL.I landplane had no fixed fin, but one was required on the CLS.I due to the destabilizing effect of the floats. The CLS.I tail surfaces underwent extensive modifications to achieve good flying characteristics, but the type arrived too late for wartime service.
	M.Schmeelke - Zeppelin-Lindau Aircraft of WW1 /Centennial Perspective/ (42)
	The Junkers J11 competed with the Zeppelin Cs.I. It used corrugated duralumin panels and was not the more advanced stressed skin structure of the Zeppelin Cs.I.