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Aviation History
1911
1911 - 0285.PDF
APRIL I, 1911. under the disadvantage of having'an unprepossess ing appearance. The design is due to a French man, M. Magnodex, and attacks a particularly interesting problem in aeroplane construction. The tandem monoplane was on the point of being the first machine to fly in America when Langley was tripped up by ill-fortune in his endeavour to demonstrate a full-sized machine of this type before representatives of the American Govern ment. Langley had succeeded in obtaining very successful flights with large power-driven models, and his construction of a man-carrying aero plane was undertaken at the instigation of th e American Government, as a direct outcome o his previous work. Faulty launching ways tw ce brought about temporary disaster to the machine, and the authorities, having little faith in those days, withdrew their support. Within a few [ weeks the Wright Bros, had secretly succeeded where Langley failed, and in the evolution of their machine the tandem monoplane has been forgotten. The necessity for overall length on a machine as a factor in its stability, and the necessity for providing an adequate body in order to carry the tail, certainly suggest the possi- LTGcED COLE. TANM.M tAONOClftNE. bility of developing a useful type in the tandem monoplane since it plausibly offers an opportunity to provide twice the lifting surface for the extra weight of a pair of wings. Whether or no the Cole machine will succeed as the modern prototype of this class we should not like to say. In its present form it certainly seems to us to be following an undesirable prin ciple in attempting to combine such unknown quantities as a tandem monoplane, wooden folding wings, twin pro pellers, and a new type of rotary engine on the same machine. TheBartelt machine is something apart from all accepted types. It consists of a steel structure of biplane appearance with loose saggy wing surfaces. The wings are mounted at their shoulders on cranks, whereby they rise and fall, while always remaining parallel to the ground. The motion of the cranks being circular, the wings, simultaneously with their rise and fall, move forwards and backwards—in other words, they perform a modified form of paddle action, the object being to derive support by beating the air. The wing motion is obtained from chain transmission, and in addition to the sup porting reaction, there is said to be a propelling force sufficient to keep the machine going with out the small propeller that is such a comparatively insigni ficant constructional feature of the machine as a whole. We are informed that the small scale prototype of the machine exhibited actually flew with a pilot weighing 8 stone 4 lbs. BRITISH ENGINES. A.B.C. Built in Great Britain by Messrs. the All British (Engine) Co., Ltd., Redbridge Motor Works, Redbridge, Hants. „ The 80-h.p. A.B.C. engine. LEADING particulars of the 40-h.p. A.B.C. engine for aeroplanes :—4 cylinders ; 4J in. bore ; 4J in. stroke ; four cycle ; water-cooled ; guaranteed to develop 40-h.p. at 1^300 r.p.m. ; fuel consumption, -6 pint petrol per horse power hour under above conditions ; weight, 185 lbs., including all accessories (except the radiator, and without fly-wheel). Characteristic features in design and construction :— Type.—Vertical. Cylinders and jackets.—Separate, cast-iron with steel belts, corrugated copper jackets. Bearings. —Five. Valves.—Overhead, mechanically operated. Supplementary exhaust ports.—None. Carburettor. Ignition.—Bosch high-tension magneto, single or dual. Firing intervals in degrees of crank-shaft rotation through out one complete cycle, 1800. Lubrication.—Forced feed by gear pump to all bearings. The 80-h.p. A.B.C. engine :—8 cylinders ; 4$ in. bore ; 4f in. stroke ; four cycle; water-cooled ; guaranteed to develop 80-h.p. at 1,250 r.p.m. ; fuel consumption, -65 pint petrol per horse-power hour under above conditions ; weight, 275 lbs., including all accessories (except the radiator, and without fly-wheel). Characteristic features differing from the 40-h.p. :— Type.—Vee, go0. Firing intervals in degrees of crank-shaft rotation through out one complete cycle, 900. The 120-h.p. A.B.C. engine:—12 cylinders; 4f in. bore; 4J- in. stroke ; four cycle ; water cooled ; guaranteed l<> develop 120-h.p. at 1,250 r.p.m. ; weight, 400 lbs., including all accessories (except the radiator, and without fly-wheel). Characteristic features differing from the 40-h.p. :— Type.—Vee, 900. Firing intervals in degrees of crank-shaft rotation through out one complete cycle, 6o°. Alvaston. Built in Great Britain by Messrs. Alvaston Motors, Ltd., Derby. LEADING particulars of the 50-h.p. Alvaston engine for aeroplanes :—4 cylinders ; 114 mm. bore ; 128 mm. stroke ; four cycle; water-cooled ; guaranteed to develop 50-h.p. at 1,200 r.p.m ; fuel consumption, • 7 pint petrol per horse power hour under above conditions; weight, 160 lbs., including all accessories (except the radiator). 287
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