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Aviation History
1928
1928 - 0947.PDF
OCTOBER 11, 1928 BRISTOL " JUPITERS " AT BERLIN: The Series VII, or supercharged model, giving 440 h.p. at 1,950 r.p.m. detail each type exhibited—evan if we had the space to do so. We will, however, briefly run over the special features of each, and give the more important items from their specifications. Generally speaking, all these engines are of similar con- struction, varying mainly in certain details according to the purpose for which each type is intended—whether direct drive, geared, or supercharged, etc. There are, however, certain refinements on these exhibition engines, and it is to these features we intend to refer, assuming that the reader is familiar with the general Bristol construction. All the " Jupiters " are, of course, 9-cyl. air-cooled radial eng'nes the " Titan "—in which a large number of standard ' Jupiter" parts are employed in its construction—being a 5-cyI. radial. The " Jupiter VIA " is a high-compression version of the well-known series VI direct-drive engine. In the " Jupiter VII," we have a supercharged engine, or one fitted with a mechanically-driven blower or " booster," which provides a certain degree of supercharging enabling the engine to produce its full power at 12,000 ft. The series VIII—a comparatively recent member of the family—is a geared engine. Turning now to the refinements. For instance, in the Series VIA and the " Titan," the arrangement of the auxi- liaries on the back of the engine have been altered. The magnetos are now located at right angles 4.o the crankshaft— as are also the petrol pumps—instead of being placed at an angle diagonally. As a result of this arrangement, a space i- obtained in the centre of the engine for the fitting of an BRISTOL "JUPITERS " AT BERLIN The Geared " Jupiter VIII," which develops 480 h.p. at 2,200 r.p.m. 877 . . . . - = • -. j...r.
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