O.Thetford, P.Gray German Aircraft of the First World War (Putnam)
Oertz W 8
After the Flugschoner, which was a tandem wing biplane, more normal wingtip floats were used and the wings themselves of conventional layout. The later aircraft were designed for the 260 h.p. Argus As IV engine, but this never materialised in time, and they were fitted with airship Maybachs of some 240 h.p. and still managed to give a performance in excess of the estimated figures, later in the war the firm was absorbed into the Hansa Brandenburg concern.
Engine, 240 h.p. Maybach Mb IV. Span, 19.6 m. (64 ft. 3 3/4 in.). Length 10.7 m. (35 ft. 1 1/4 in.). Height, 3.54 m. (11 ft. 7 1/8 in.). Area, 70 sq.m. (756 sq.ft.). Weights: Empty, 1,584 kg. (3,484 lb.). Loaded, 2,225 kg. (4,895 lb.). Speed, 136-140 km.hr. (85-87.5 m.p.h.). Climb, 2,000 m. (6,560 ft.) in 21 min.
J.Herris German Seaplanes of WWI (A Centennial Perspective on Great War Airplanes 15)
The last Oertz flying boat to be built was the W8. It was known as the Kruppboot because it was presented to the Navy by Krupp von Behlen und Halbach. The W8 was powered by a 240 hp Maybach Mb.IV and generally followed the configuration of earlier single-engine Oertz flying boats. However, it reverted to conventional wing-tip floats instead of the sprung boards used in many earlier designs, and additional bracing for the upper wing tips was added. Like the other single-engine Oertz boats, it had a crew of two seated side-by-side. Only one was built.
The photos show the W8 was built with the exceptional finish quality typical of Oertz, and its refined design enabled a top speed of 140 km/h, faster than any other Oertz design.
Oertz W8 Specifications
Engine: 240 hp Maybach Mb.IV
Wing: Span 19.6 m
Area 70.2 m2
General: Length 10.7 m
Height 3.55 m
Empty Weight 1,578 kg
Loaded Weight 2,224 kg
Maximum Speed: 140 km/h
Flight, October 9, 1919.
THE OERTZ FLYING BOATS
"Figs. 6 and 7 show an Oertz flying boat specially designed for the 240 h.p. Maybach engine. This machine was presented to the Navy by Messrs. Krupp von Bohlen and Halbach. All previous experience was taken advantage of in the design of this boat, and especially was the step question solved successfully. The wing-tip spring boards were replaced with small, low-resistance wing-tip floats. [So they had to come back to them after all, in spite of the previous remarks as to the danger caused by them. - ED., FLIGHT.] The actual performance of this boat exceeded the estimated figures, the speed being 87 m.p.h., as against the estimated speed of 80 m.p.h. This made the Oertz flying boat the fastest in the Navy.