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Aviation History
1919
1919 - 1086.PDF
geared designs. Only the former were built, however, as Sherbondy soon became convinced that the utilisation of the exhaust gas energy for driving the impeller was to be preferred, for reasons which have already been pointed out. Although neither Sherbondy's nor Moss's machine was ready for actual flight tests at the time the Armistice sur prised the world, the work had so far progressed that it remained only to alter certain of the mechanical details so as to overcome weaknesses which the extensive ground tests had brought to light, when either machine would un doubtedly have been ready for preliminary trial in the air. This is particularly true of the Moss supercharger, which has been subjected to gratifying altitude tests on a portable dynamometer at the summit of Pike's Peak—a little over 4,000 ft. above sea level. If the work of European experimenters had not already convinced the aeroplane engineering world that there is great advantage to be gained by maintaining a constant pressure before the carburettor regardless of the altitude— within limits, of course—these altitude tests of the Moss device would have proved it. The advantages being already fully appreciated, due to the earlier tests in England, France and Italy, the results obtained with the Moss apparatus served to further strengthen the validity of the theories back of the idea. The Sherbondy Superchargers Fig. 1 gives a very clear idea of the general arrangement of the apparatus of the Sherbondy turbo-compressors as laid out for the Liberty twelve-cylinder engine. The two carburettors are carried on the one induction pipe, which has air-tight joints to the carburettor air intakes, and also to the compressor discharge. The specially-designed exhaust manifolds which lead the exhaust gases to the turbine are also illustrated clearly. The compactness of the turbine and compressor unit proper is seen, this main part being designed to attach to the front of the engine without inter- feringjwith the normal position of the propeller. Installation 1088
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