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Aviation History
1920
1920 - 0181.PDF
FEBRUARY 12, 1920 TWO SUNBEAMS : On the left the Manitou, and on theright the Matabele ' Flight " Copyright Rolls-Royce This famous British firm was represented at the Paris Show by one engine only, the Falcon in the Westland limousine. The Rolls-Royce engines are, however, so well known that there is no need to enter into detailed descriptions of them here, suffice it to point out that among the successes scored by these engines are the two famous flights of last year • the Transatlantic and the London-Australia. Salmson (Systeme Canton-Unne) Of the engines exhibited by this firm, perhaps the most interesting, from the point of view of novelty, were the large 18-cylindered 500 h.p. engine and the new air-cooled radial. Hitherto the Salmson engines have all been of the water- cooled type, and it therefore came somewhat as a surprise to many to find an air-cooled engine exhibited on this stand. The 300 h.p. engine, Type A Z 9, is also interesting, and for commercial aviation probably likely to be more useful than the 18-cylindered, Type 18 Z. The air-cooled engine, the Type 9 RA, is a nine-cylindered radial like the water-cooled models, and has a strong resem- blance to them apart from the feature of cooling. The cylin- ders are of steel, with aluminium jackets carrying the fins. There are two overhead valves, operated by push rods, in each cylinder, the valve springs being of the wire type. The crankshaft is of the single-throw type, there being one master connecting-rod to which attach the eight auxiliary rods, ball bearings being provided. The bore and stroke of this engine are 125 mm. and 170 mm. respectively, and the rated power of 200 h.p. is developed at 1,500 r.p.m. It is said that for short periods the engine may be revved up to 1,550 r.p.m.,- when the power is 245 h.p. Evidently there is some mistake here, for one can scarcely credit that another 50 r.p.m. would add 25 per cent, to the power deve- loped. Probably the figure should be 1,850 r.p.m. The fuel and oil consumption at 1,500 r.p.m. is given as -595 lb. per h.p. per hour. The weight of the engine complete with magnetos and carburettor is 230 kgs. (500 lbs.). The type A-Z 9 is also a radial 9-cylindered engine, but is provided with water cooling. Generally speaking, it resembles earlier models, but an innovation which will be appreciated for commercial work is that each cylinder is bolted to the outside of the crank-case instead of projecting into it. This greatly facilitates the removal of separate cylinders without disturbing the rest. The nine steel cylinders, with separate sheet steel water jackets welded on, have a bore of 140 mm., while the stroke is 170 mm. - The normal engine speed is 1,500 r.p.m., when the power is about 300 h.p. The weight of the engine is given as 300 kgs. (660 lbs.), magnetos and carburettors, but without water and radiator. The fuel and oil consumption are sa.id to total -56 lb. per h.p. per hour. As regards the durability of the engine, it is claimed that it will run for 1,000 hours without requiring any serious repairs, while the makers state that, normally and without special care, the A-Z 9 will run for 50 hours without stopping. If these claims can be made good, and we have no reason to doubt it, this engine should become very popular for commercial aviation. Finally, of novel types, the Salmson firm exhibited a 500-h.p. engine with 18 cylinders, which is, practically speak- ing, two groups of nine placed on a common crank case. Its detail features resemble those of the smaller models. Ad. Seghers. (Seja). A rotary engine of very unusual design was exhibited by this firm. The engine, which has been designed by M. Emile Schultz, Assistant Engineer of Bridges and Roads of Paris, has oscillating cylinders, mounted in trunnions on two sub- stantial rings which correspond, in a way, to the periphery of the ordinary crank case. Both cylinders and pistons are cut away at their inner ends in order to make the engine more compact. The pistons, at the inner end of the stroke, are '' Flight " Copyright. THE LARGEST AND THE SMALLEST SUNBEAM : On the left the Sikh, and on the rght the Dyak
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