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Aviation History
1926
1926 - 0956.PDF
DECEMBER 9, 1926 more like a rotary, with its wasp-like buzz instead of themore staccato notes of the majority of radials. It has a bore of 70 mm. and a stroke of 86 mm., and develops 40 h.p.at a speed of 2,000 r.p.m. The weight is 75 kgs. The A.C. 7-95 h.p. engine is next on the list, taking theengines in the order of power developed. This is one of the two new models produced for this year's Paris Salon, andis a 7-cylinder radial air-cooled, with a bore of 100 mm. and a stroke of 130 mm. It develops 95 h.p. at 1,800 r.p.m.,and weighs 130 kgs. The A.C. 9-120 h.p. engine has the same cylinders, pistons,etc., as the A.C. 7, so that the spare parts that have to be kept are identical. The only difference between the twotypes is that the larger engine has 9 cylinders and the smaller 7. The characteristics of the 120 h.p. type are : Bore, 100 mm.;stroke, 130 mm. ; power, 120 h.p. at 1,800 r p.m. • weight 170 kgs. The A.B. 9-230 h.p. is similar in type to the other engines,i.e., is a 9-cylinder radial air-cooled, but the bore and stroke have been increased to 125 mm. and 170 mm. respectively.This engine develops 230 h.p. at 1,700 r.p.m., and weighs 240 kgs. The A.B. 18-460 h.p. has the same bore and stroke asthe A.B. 9, but has 18 cylinders arranged in two rows of nine each, and a special feature of this engine—which is thesecond of the two new models to be shown—is that the front and rear cylinders are placed one directly behind the other,instead of being staggered as is more usually the case. The precise reason for this arrangement we have not been ableto ascertain. It would appear that the rear cylinders might tend to be somewhat inadequately cooled, although weunderstand that the manufacturers claim that perfectly even cooling is obtained owing, probably, to the somewhat disturbedflow of the air in the slip-stream from the propeller, which strikes the cylinders diagonally rather than in a directfore-and-aft direction. The placing of the cylinders behind one another, with the push rods situated in front, hasnecessitated some rather unusually long rocker arms for the operation of the valves of the rear cylinders. Incidentally,it might be mentioned in this connection that there are only two valves per cylinder. The A.B. 18 has a bore of 125 mm.and a stroke of 170 mm., develops 460 h.p. at 1,700 r.p.m., and weighs 490 kgs. This completes the list of air-cooled engines shown on theSalmson stand. The two remaining engines are of the radial water-cooled type. The CM. 9-260 h.p. engine h?.s a bore of 125 mm. anda stroke of 170 mm., develops 260 h.p. at 1,650 r.p.m , and weighs 250 kgs. The CM. 18-500 h.p. has its 18 cylinders arranged in tworows of nine each, the cylinders being behind one another as in the 18-cylinder air-cooled, but, of course, water-jacketed. A placard on the stand announces that this engine has beenused extensively on commercial machines, and has also been fitted on the "Breguet XIX A.2, Potez XXV A.2, andCaudron 107 G.R., as well as on Hanriot and Bechereau machines. An engine of this type completed 150 hours'running in 15 runs of 10 hours each without changing a single part, or even a single accessory. THE WALTER ENGINES THE J. Walter A. Spol Co., of Prague, exhibits three types of engine, all radial air-cooled, ranging in power from 60 h.p. ENGINES AT THE PARIS SHOW : The 60 h.p. Walter. to 110 h.p. All three engines have the same bore and stroke,the same cylinders, pistons, etc., so as to reduce cost of manufacture, and the number of spare parts to be stockedby users of the three types. Specification of the " Walter 60 ": 5 cvlinders ; bore, CZECH ENGINES AT THE PARIS SHOW : Two Walter radials, on the left the 85 h.p. and, right, the 110 h.p. 812
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