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Aviation History
1920
1920 - 1269.PDF
DECEMBER 16, 1920 . The Do. Rs. Ha getting off : Note the absence of spray. slight alteration in the wing bracing, the tubular vee-struts being carried inwards to the top rails of the boat instead of forming, in front view, a Warren truss, as did those of the Do. Rs. I. The power plant consisted of four 240 hp Maybach engines, placed in the hull and driving three pusher air-screws. Whether because of transmission difficulties or on account of the extremely low e.g. in relation to the mono- plane wing is impossible to say, but the fact remains that after a few experiments this arrangement was discarded in favour ol direct drive, with the four engines placed on steel structures between the wing and the top of the boat. This model was we believe, known as the Do. Rs. Ha, as it was, generally the hull, their trailing edge being aft of the stern, and they are given a very pronounced dihedral angle. We regret that no data are available regarding the size and weights of this machines. The Do. Rs. Ill, 1916-17 The next machine in the series of Dornier flying boats was the Rs. Ill, in which the four 260 h.p. Maybach engines were again placed between the wing and the boat hull. The tail planes were, however, carried on a fuselage resting on the top of the monoplane wing, this fuselage being totally covered in. The tail, inci- dentally, was of the biplane form, and there were no lower wing roots. In their place lateral stability on the sea was ob- tained by making the boat hull very wide, although shallow. The wing bracing was also changed, strut bracing being discarded in favour of cable bracing. Possibly the adoption of the covered-in fuselage above the wings aimed at improving the lateral stability of the machine in the air, by providing lateral fin surface above the e.g. It might be mentioned that a similar arrangement was suggested either immediately before or during the first part of the War by Herr Ursinus, Editor of the German aviation journal Flugsport. The Do. C. I, 1917 During the year 1917 a break occurred in the series of monoplane flying boats designed by Herr Dornier. By way. SS The Do. Rs. Ill : In this machine the tail is carried on a fu s el age placed above the wing. speaking, similar to the Rs. II. The tail outriggers are, however, shorter and carry a monoplane tail plane, with a balanced elevator. There are also in this type two fixed vertical fins, the " above-and-below " rudders being balanced by small projections working in cut-out portions of the fins. The boat hull is, it will be seen, very wide, and appears to give very little spray, as shown in the photograph of the machine taking off. It is worthy of note that this hull has a vee-bottom in front of the step, while aft of the step the vee- bottom is broken in the centre by a box-like projection, not unlike those found on several French Nieuport seaplanes. The lower wing roots, it will be seen, are placed well aft on it is believed, of gaining some experience with metal fuselage covering to act at the same time as fuselage bracing, a land machine, known as the Do. C. I, was designed and con- structed. This was a single-engined tractor biplane with a 160 h.p. Mercedes engine. As the accompanying photograph will show, the Do. C. I was a very clean-looking job, and from a constructional point of view was chiefly remarkable as being the first instance of plain, smooth metal body covering acting at the same time as fuselage bracing. The wings were of ordinary construction, except for the metal spars shown in our diagram. As distinct from the majority of German machines it had a nose radiator, and altogether it looks much more like The Do. Rs. Ill : Front View. I27I
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