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.
Форум Breguet's Aircraft Challenge
The Oertz W 8 flying boat built by the Jachtwerft Max Oertz in 1917. This was actually the last in a series of flying boats built by Oertz that had the same appearence. The similarity had as its origin that the engine was buried in the fuselage driving a pusher propeller via a system of geared shafts. The W 8 was powered by a Maybach Mb 4 of 240 hp. The one-off W 8 could be distinguished from the other Oertz flying boats by the shorter lower wing.
This way of building the engine in the fuselage while driving the pusher propeller via a system of chains, was the princple on the earlier Beese-Boutard Wasserflugzeug, which incidentally was built by the Jachtwerft Max Oertz.
The W 8 was bought by the Firma Krupp and given as a present to the Marine where it got the number 1157. Because of this the machine was popularly known as the "Krupp-Boot". No particulars are known over the service history of this machine in the German Marine service.
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.