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Aviation History
1919
1919 - 1189.PDF
SEPTEMBER 4, 1019 MAINTAINING CONSTANT PRESSURE BEFORE THE CARBURETTORS OF AERO ENGINES REGARDLESS OF THE ALTITUDE By LESLIE V. SPENCER, M.E. (formerly Editor of Technical Publications, Experimental Department. Aeroplane Engineering Division, Bureau of Aircraft Production at the McCook Field, Dayton) (Concluded front page 1090) The Moss Turbo-Supercharger IT has previously been brought out that the Sherbondy and Moss turbo-superchargers have few mechanical details in common, although both designs adhere to the same prin ciples of operation. This is to be expected, in that both engineers worked entirely independently of one another. Therefore, neither device has a monopoly of all the good features ; each has certain advantages that the other lacks, and in the final analysis it might be said that both are about on an equal footing as regards efficiency, when everything is taken into account. market as a commercial proposition. It will be appreciated, therefore, that Dr. Moss was not striking out blindly along a new engineering path in designing a small turbo-compressor unit, but the pew part was the producing of such a unit for the highly special service which it is called upon to perform NOZZLE BOX fXHAUST CHAMBER The supercharger developed by Dr. Moss of the General Electric Co. Dr. Moss, in his development work, had back of him his experience and that of the General Electric Co., Lynn, Mass., with which he is connected, whereas Mr. Sherbondy per formed his work independently. He was, however, assisted by the Fergus Motors of America, Newark, N.J., which concern did much of the accurate construction work under his direction, and by the De Laval Steam Turbine Co., Trenton, N.J., where prelimi nary steam tests of the Sherbondy outfit were made prior to any operative trials on the Liberty engine. On the other hand, all Moss experimental work was carried on by the General Electric, including steam testing. Like Mr. Sherbondy, Dr. Moss was specially fitted to conduct experimental and research work on exhaust gas turbines and direct- connected air compressors through wide ex perience with gas turbines in general. The General Electric Co. has carried on experi mentation for a number of years under Dr. Moss's direction along this line, but the difficult nature of the gas turbine problem is brought out forcibly by the fact that to date this concern has not been able to per fect its turbine and compressor units to the point where it cares to put them on the Cross-section of an exhaust turbine-driven super charger designed by Prof. Rateau in France in an aviation engine in connection with the Rateau system of supercharging. As the illustrations show/ the Moss turbo-supercharger incorporates the turbine rotor and the centrifugal com pressor air impeller on the same shaft, and is arranged so as to leave the Liberty engine carburettors in the centre of the V, connected to the air discharge of the compressor by an induction pipe of generous proportions which is rectangular in section. The engine exhausts are on the outside, and the The Moss supercharger installed on a Liberty Twelve 1191
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