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Aviation History
1928
1928 - 0630.PDF
As already mentioned, the Bristol " Titan " is a five-cvlinder radial employing in the main standard " Jupiter parts. Obviously the crankcase is different, while the masterconnecting rod is also of necessity different from that of the 9-cylinder engines. But all main parts such ascylinders, pistons, articulated connecting rods, crankshaft, etc., are interchangeable with those of the ' Jupiter," a factwhich may often be of great advantage from the point of view of spares. The famous Bristol three-start spiralinduction system cannot, of course, be employed on a 5-cylinder engine, and therefore an engine-driven mixturedistributor fan has been embodied. This is not a super- charger in the sense that it forces a greater quantity offuel in than would be naturally aspirated, while the JULY 5, 1928 " booster " of the series VII, being run at many times theengine speed, does do so. In the " Titan " the fan runs at engine speed and merely ensures good mixture and a fullcylinder charge. The main particulars of the Bristol " Titan " are asfollows : Bore, 5-75in. (146 mm.) ; stroke, 6-5 in. (165 mm.) total swept volume, 842 cub. in. (13-8 litres) ; compressionratio, 5 to 1 ; rated normal power, 200 b.h.p. at 1,700 r.p.m. ; maximum power, 220 b.h.p. at 1,870 r.p.m. ; weight dry,500 lbs. (227 kgs.) ; fuel consumption, 13 galls, per hour; oil consumption, 2 pints per hour. A service type withhigher compression ratio (5-3 to 1) is also produced, developing 220 h.p. at 1,700 r.p.m. and a maximum of240 h.p. at 1,870 r.p.m. THE ARMSTRONG-SIDDELEY ENGINES ARMSTRONG-SIDDELEY MOTORS, LTD., are exhibiting theircomplete range of radial air-cooled engines, i.e., the " Genet," the " Mongoose," the " Lynx " and the " jaguar." Mountedon exhibition stands and with their " show finish," the four engines look remarkably well, and compare well withthose of other firms in the matter of finish and workmanship. The position in the show is quite a good one, although underthe gallery ; and the four engines, forming a whole "family" as it were, never fail to attract the visitors. In view of the prominence which the two " elder members "of the family have attained, it is scarcely necessary to describe them in detail. It will suffice if we recall that the *GENET "LYNX 'JAGUAR" THE FOUR ARMSTRONG-SIDDELEY ENGINES AT THE PARIS SHOW : Covering a range from 80 b.h.p. to more than 400 b.h.p., these four power units should supply the requirements of any imaginable type of aircraft. 578
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