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Aviation History
1928
1928 - 0979.PDF
OCTOBER 18, 1928 The Dornier Sup e r - W a 1 " B 1 a u wal " : This photograph shows the cowl- ing of the aft en- gines, the shape of the wing- stump floats, and the narrow-beam aft step with water rudder. 5 B5 m short span. The streamline wing float, on the other hand, does not give any lift in return for its drag, but we imagine that the drag itself is probably smaller, partly because of the shape, and partly on account of the smaller volume which a farther outboard position makes possible. As regards the internal equipment of the " Super Wal," this is very comfortable for the 19 passengers, the portholes being large and giving a reasonably well-lighted cabin. The actual cabin space is divided into two separate saloons by a smaller compartment, seating accommodation being provided for 11 passengers in the forward saloon and for eight in the aft saloon. The " Super Wal " is very fully provided with navigation and wireless equipment, and the hull contains, in addition to the two saloons, goods and luggage compartments, as well as a wireless and navigator's cabin. The pilots' cockpit is ahead of the wing, and has a " coach roof " over it for the protection of the occupants. The normal quantity of petrol carried is 3,800 litres (836 gallons), and the oil 300"litres (66 gallons). The main dimensions and weights of the " Super Wal are as follows:—Length overall, 24-6 m. (80-6 ft.); wing span, 28-6 m. (93-8 ft.) ; wing area, 143-8 sq. m. (1,547 sq. ft.) Weight empty, 7,800 kg. (17,150 lb.) ; normal loaded weight, 12,600 kg. (27,700 lb.) ; wing loading, 17-9 lb./ sq. ft; power loading (on 2,000 h.p.), 13-88 lb./h.p. ; maximum speed, 220 km. h. (136-5 m.p.h.) ; cruising speed, 180 km./h. (112 m.p.h.). Exhibited in the open, between Halls II and III, is a Dornier Dolphin III with B.M.W. engine. Designed for use over fairly sheltered waters such as for coastwise flying or operating from inland lakes, this machine is, strictly speak- ing, neither flying-boat nor seaplane, but something in between the two types. A single flying-boat hull, of small size, has been built on to the floor of what may be regarded as a fairly orthodox aeroplane fuselage, and lateral stability on the water is obtained as in the large Dornier flying-boats, by wing stumps growing out of the sides of the hull. The monoplane wing is braced by struts as in the large flying- boats, and the engine is mounted high above the forward part of the fuselage so as to give clearance between the propeller tips and the forward deck of the hull. The pilot is situated in a forward part of the cabin, where ffi & £ a K The Dornier "Dolphin": De- veloped from the "Komet" type of landplane, this K machine has a i£ central hull added „. to a normal fuse- lage, but with an unusual engine ffi placing. 8 •s •-• 909
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