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Aviation History
1914
1914 - 0443.PDF
APRIL 25, 1914, supplied to various entrants in this competition and to others interested in the erection and the equipment of similar testing plants. Two longitudinal channel girders are grouted into the floor, and carry the water dynamometer at one end and two H section cross girders at the other. These latter are attached to the fixed girders by means of sliding clamps; and, with the short 1/PCHTl Fig- 3- The exhaust gases from the engine are carried away by means of a flexible metallic tubing having a diameter of 4 ins., connected at one end to the engine exhaust pipe, and at the other to a pipe which passes through the wail to the outside of the building (see Fig. 4). The latter pipe terminates in an expansion chamber having a capacity of about 130 cubic feet, tnrough which the ga»es have a perfectly free passage as there are no baffles to cause any restriction in the flow. Flap Fig, 3.—Arrangement and details of the transmission and fan shafts. beams placed above them, may be secured in any desired position, thus rendering it possible to readily mount an engine of any size and type upon the bed. Any manufacturer, however, is at liberty to supply his own supports for attachment to the lower fixed girder, should he wish to do so. The tilting beds are similarly provided with adjustable girders to facilitate the mounting of the engines. It will be seen from Fig. 1 that the engine is not rigidly attached to the brake, but that the power is transmitted through a short doors are, however, provided in order to quickly release the pres sure generated in the event of an unexploded charge becoming fired within this chamber or in the piping communicating with it. A tachometer is driven from the extreme end of the brake rotor shaft by means of flexible shafting, and a revolution counter, for recording the exact number of revolutions made by the engine, is also fitted, as the tachometer merely indicates the revolutions per minute at any Fig. 4.—Arrangement of oil, water and exhaust piping. The air casings are also shown in position. cardan shaft fitted with universal joints at both ends, and similar in design to those used in automobile practice, so that the slightest defect in the alignment of the engine shafting with the brake shafting will not introduce any inaccuracy in the measurement of the power, neither will there be any thrust or pull on the engine or brake shafts. The details of this shafting are clearly shown in instant, and does not register the revolutions made during an interva of time, which is the important factor in determining power. The dynamometers used are of the type which is manufactured by Messrs. Heenan and Froude, of Worcester, and in view of the fact that Osborne Reynolds, when carrying out his experiments in connection with the Mechanical Equivalent of Heat, employed a 443
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