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Aviation History
1913
1913 - 0722.PDF
I/U GHT JULY 5, 1913. ANZANI ENGINES AND THE NEW 200 H.P. MODEL. THE rapid development of the Anzani aero engine has been both interesting and remarkable, starting as it did with the 3-cylinder motor with which Bleriot flew the Channel, on July 25th, 1909, and culminating in the latest production, which is a 20-cylinder engine rated at 200 h.p. Intermediate types have been produced in plenty, but the mere citation oi these two extremes is sufficient evidence of the adminis trative initiative at the Anzani works. The first of these 200 h.p. engines has been built and tested, and is already on its way to its 200 h.p. 20-cyl. type Anzani.—Rear view. purchaser in America, where it is to do work on a hydro-aeroplane. This engine consists of four groups of five radial cylinders, the groups being staggered so as to dispose all the cylinders at equal angular intervals round the axis of the crank-shaft. In a circle there are 360 degrees, consequently the angle between one cylinder and the next is 18 degree?. The cylinders have a bore and stroke of 105 mm. by 140 mm., and develop 200 h.p. at 1,200 r.p.m; A Zenith carburettor and Gibaud magneto form standard fittings. The weight of the engine complete is 572 lbs., which represents 2-86 lbs. per h.p. on a basis of 200 h.p. 70-80 and 100-110 h.p. 10-cyl. Anzani types.—Rear view. "> The cylinders are of cast iron, and are ribbed for air-cooling. Long bolts reaching to the cylinder-heads fatten the cylinders to the crank-chamber. The crank-chamber itself is in three parts, consisting of a central drum and two end p'ates. The valve-gear for the first and second groups of cylinders is fitted in front, while that for the third and fourth groups is arranged behind the engine. It is only the exhaust-valves that are operated mechanically, the inlet-valves work atmospherically, being opened by the suction of the engine and closed by the valve springs. Radial induction pipes communicate from the valve chambers in the cylinder heads to a central mixing If^Sv $if f,• p"*X» ^dr*Jk \X\^ iirti *\ V* \ ** jg • S»j ^HA. (f > - -m\ | . h4. \ -ty.** . *%Jm k3Pr » #/ _ **ifl-tiif *v* I § * t *> •'I "^^'B Iff: "Mffijw • m I in * •K: , 200 h.p. 20-cyl. type Anzani.—Side testing chassis. view, mounted on chamber cast in the crank chamber. There is a mixing chamber at each end of the engine, and each mixing chamber is supplied inde pendently by a separate carburettor. The throttle controls, however, are operated in unison. Two high-tension magnetos are similarly required for the ignition of the 20 cylinders. Lubrication is effected by a pump, which forces oil under pressure through the hollow crank-shaft. The other Anzani models now current include the 3-cyl. 30 h.p. motor, with a bore and stroke of 105 by 120 mm., which develops its full power at 1,300 r.p.m., and weighs 120 lbs. The new 6-cyl. 40-45 h.p., with a bore and stroke of 90 by 120 mm., which develops its full power at 1,300 r.p.m., and weighs 154 lbs. The 6-cyl. 50-60 h.p. engine, with a bore and stroke of 105 by 120 mm., which develops its full power at 1,300 r.p.m., and weighs 200 lbs. This engine is a composite group of two of the 3-cyl. 30 h.p. models, but designed, of course, as one engine. The new 10-cyl. 80 h.p. engine, with a bore and stroke of 90 by 130 mm., which develops its full power at 1,250 r.p.m., and weighs 238 lbs. This design has its ten radial cylinders all in one plane, like the 40-45 h p. 6-cyl model and the 30 h.p. 3-cyl. model. The 10-cyl. 100 h.p. engine, with a bore and stroke of 105 by 140 mm., which develops its full power at 1,200 r.p.m., and weighs 308 lbs. This engine is com posed of two groups of five cylinders, and when duplicated constitutes the basis of the design of the new 200 h.p. model already described. ® © ® ® Bonn's Propellers. WE have received a communication from Mr. C. C. Dutton, a member of the Paddington and District Model Aero Club, to the effect that the propellers used by him at the K. and M.A.A. trials on June 21st, when he secured the club's silver gilt medal, were not " Bonn Invincibles," as inadvertently advertised by them. It will be seen by their advertisement this week, Messrs. J. Bonn & Co., Ltd., acknowledge the error. 748
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