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Aviation History
1920
1920 - 0180.PDF
••"*• FEBRUARY 12, 1920 TWO SALMSON ENGINES " Flight " Copyright. On the left the type AZ 9, nine-cylindered engine, and on the right the type Z 18 well known, this lirm commenced their career with air-cooledengines of the Vee type, best known of which is, perhaps, the old 70 h.p. engine familiarised in this country by theM. Farman biplanes. As the call for greater and still greater power was raised by War conditions, the Renault firm turnedtheir attention to the production of water-cooled engines, still, however, adhering to the Vee type. The 300 and 450 h.p.engines are already familiar from their extensive use in War machines, and there is, therefore, no need to go into theirdetails here. As regards the new 600 h.p. engine, however, this was only being completed at the cessation of hostilities,and has not, therefore, had the opportunity of proving itself to the same extent as the other models, nor is it so generallyknown as the earlier types of which it is a development. Generally speaking, the new 600 h.p. Renault follows on thelines of previous types, but a very noticeable " cleaning up " has been effected, as the accompanying photograph willshow. The bore and stroke of the 600 h.p. are 150 mm. and 175 mm. respectively, and the normal speed at which thispower is developed is 1,600 r.p.m. The 12 cylinders, each in its separate sheet-steel welded water-jacket, are arranged " Flight " Copyright THE SEJA ENGINE : This engine is of most unusual design, the cylinders being mounted in trunnions, while the connecting-rods are rigidly attached to the pistons in two banks of six, placed at an angle of 6o°. As in previous models overhead valves and overhead camshafts are em- ployed, the camshaft and valve-housing being one of the features that have been subjected to the " cleaning up " process. These covers now totally enclose the valve gear, and the result is a very neat appearance of the top of the cylinder banks. The carburettors—two double Zeniths— are placed on the outside, each supplying two groups of three cylinders. The exhaust valves and pipes are on the inside of the Vee. Ignition is by two SEV 12-cylindered magnetos mounted on the rear end of the engine, and supplying the two plugs in each cylinder. The weight of the 600 h.p. Renault is given as 530 kgs. (1,165 !bs.). The fuel and oil consumption at full throttle are stated to be -55 and -055 lb./h.p./hour respectively. " Flight" Copyright The two-cylindered air-cooled Siddeley 40 h.p. engine, installed in the Bristol Babe
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