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Aviation History
1924
1924 - 0755.PDF
DECEMBER 4, 1924 Both these engines are of the radial air-cooled type, and each has given exceptionally good results in actual practice. The "Jaguar" has 14 cylinders arranged in two radial banks, the cylinders of one bank being staggered in relation to those of the other bank. It develops a b.h.p. of 385-425, the normal b.h.p. being 410 at 1,700 r.p.m. The cylinders have a bore of 5 ins. (127 mm.) and a stroke of 5-5 ins. (140 mm.). Inlet and exhaust valves, which are interchangeable, are mounted in the cylinder head and are operated by light and stiff rocker arms through push-rods from two cam rings (one for inlet and one for exhaust) located in the front portion of the crankcase and rotating at one-sixt)i| engine speed in an opposite direction to that of the crankshaft The mixture is supplied from a dual carburettor by way of a fan arrangement located in the rear portion of the crankcase and driven at engine speed. The crankshaft is of the two-throw type with a common split- ring big end to which is connected the master connecting rod and the other six rods. The connecting rods (steel) are machined all over to ensure perfect balance, the master rods being of channel section and the others of circular section. Pistons are aluminium alloy, and the cylinder barrels are of steel with aluminium alloy heads, while the crankcase, which is in three parts, carries a pressed-steel cone forming the engine bearer which is to be bolted to the plate attached to the nose oyfthe aeroplane fuselage for that purpose. The weight of the " Jaguar " dry is 775 lb. (345 kgs.), and the petrol consumption is 0 • 56 pint (0-298-0-312 litre) per b.h.p.-hour ; the oil consumption is 0-03 pint (0-017 litre) per b.h.p.-hour. The overall diameter of the " Jaguar " is approximately 44 ins. (1,180 mm.) and the total length is 43 in. (1,080 mm.). The Armstrong-Siddeley " Lynx " is a 7-cylinder engine, giving 185 b.h.p. at a normal engine speed of 1,620 r.p.m. The cylinders have a bore and stroke of 5 ins. (127 mm.) and 5-5 ins. (140 mm.) respectively. Most of the constructional features of the " Lynx "—cylinders, valve gear, connecting rods, etc.—are identical to those of the " Jaguar," differences occurring only where difference of type of engine calls for this. The crankshaft is, of course, of the single-throw type, but the common split-ring big-end arrangement is the same as that in the " Jaguar." As in the " Jaguar," the " Lynx " is provided with the conical steel mounting plate, bolted to the rear end of the crankcase. The weight of the "Lynx" is 480 lb. (209 kgs.). The petrol and oil consumption per b.h.p.-hour are 0-56 pint (0-298-0-312 litre) and 0-03 pint (0-017 litre) respectively. As previously stated, both the " Jaguar " and the " Lynx " have successfully passed their type tests, and both have given every satisfaction in practice. THE BRISTOL AEROPLANE CO., LTD., FILTON, BRISTOL THE Bristol Aeroplane Co., although not showing any aeroplanes at this year's Paris Aero Show, will have a repre sentative exhibit as regards aero engines. The entire Bristol family of this branch will be there, consisting of the Bristol " Jupiter," the Bristol " Lynx," the Bristol " Cherub," and the Bristol gas starter. The Bristol " Jupiter " is too well known to need anv extensive introduction here, for it has not only given a good account of itself, both on the bench and in the air, in its native land, but in France as well. It is a nine- cylinder radial air-cooled engine, developing 400 h.p. at 1,575 r.p.m., which is the normal engine speed. The " Jupiter " possesses many unusual and important features, the outstanding one of which—and this applies •equally to the other two engines—is the extreme simplicity andjcleanliness of the'design. The external appearance of the engine, as may be seen from the accompanying illustration, presents a remarkable absence of " gadgets," external components having been reduced to a minimum. Another noteworthy feature of the " Jupiter " consists of the special spiral induction manifold, embodied within the crank-case, by means of which each of the three carburettors fitted supplies three cylinders, thereby giving an even and uniform distri bution of mixture. The cylinders have a bore and stroke of 5 -75 ins. (146 mm.) and 7-5 ins. (190 mm.) respectively. A maximum horse power of 425, at full throttle, is developed at a speed of 1,700 r.p.m. The weight of the engine comes out at 730 lbs. (332 kgs.), and the petrol and oil consumption per brake horse-power-hour are 0 • 594 pint (0 • 339 litre) and 0 • 049 pint (0-028 litre) respectively. ONE MEMBER OF THE BRISTOL FAMILY AT THE PARIS SHOW: Front and side views of the 3-cylinder 100 h.p. " Lucifer." 755
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