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Aviation History
1938
1938 - 2040.PDF
48 FLIGHT. JULY 14, 1938. COMPRESSION RING, (CLOSED &, FLOATING) GASKET FOI PISTON BODY' PROTECTION LIGHT ALLOY BODY experienced here, and it was not until methods were found of improving the cooling of the cylinder liner in the neighbourhood of the com bustion chamber that the difficulties were re duced. Curiously enough, the bearings have always stood up extremely well, and the only troubles in this connection were due to the use of compressed air for starting purposes ; elec trically operated impulse starters are now used. In 1936 the Jumo 205 was first put on to the work for which it was originally designed —that of long-stage ocean flying. In this and in the succeeding year the engine hours of the 205s in service increased more than fourfold, more than 15,000 hours being put in during 1937. In this year, too, the engine hours for the two types totalled 19,454, and, as there were 48 engines in active use, each engine was averaging more than 400 hours' flying. For the present the total life of a diesel engine cannot be satisfactorily predicted. Those in service with the longest life have so far run for about 1,000 hours. Overhauls are carried out after every 250 hours—a figure which is naturally well below the normal one for petrol engines, though, to be fair, one should take petrol engines of ten years ago for comparison. At the end of last year twenty-two machines in the D.L.H. fleet were fitted with heavy-oil engines. Thirteen of these were Junkers Ju.86, four were Dornier 18 and two were Blohm and Voss Ha. 139 floatplanes—all of which were fitted with Jumo 205 engines. The other three DORNIER Do. 18. CUT-AWAY FOR -CONNECTING ROD GROOVES FOR RUBBER PACKING RINGS "CADMIUM-PLATED SURFACES FOR WATER COOLING Useful load (lb.). 882 882 882 Fuel (galls.). 00 0 00 0 0 C O CO 0 0 C O Speed (m.p.h.). !37 124 112' Range (miles). 3.107 3.417 3.542 Details.of the construction of the Jumo piston (above) and " double- ended '' cylinder. machines, which were fitted with Jumo 204 engines, were the Junkers G38 and two eld Junkers F24. The consumption performances of the Do. 18 and of the Ha. 139 machines on the Atlantic services are given in tabular TAPPED HOLES "FOR FUEL JETS .TAPPED HOLE FOR COMPRESSED AIR INLET AiR SCAVENGING PORTS INSPECTION SLOT RUBBER PACKING RINGS BLOHM and VOSS Ha.139. 1.323 1,323 T.323 III 155 143 124 3,i°7 3,4I7 3.604 form in the adjacent column. The comparison is interesting. In the case of the Dornier the figures are those obtained in practice, since this type had completed six crossings in 1936. The actual figures for consumption showed that, for speeds between 112 and 137 m.p.h., the fuel used by both engines together lay between 1.75 and 2.25 lb. per mile. With the Ha.139 cruising at 155 m.p.h., the con sumption of all four engines has worked out at 3.87 lb. per mile in trial flights. Two machines of this type have, so far, made fourteen crossings of the North Atlantic. Aircraft Production—A New Monthly Journal TLIFFE AND SONS LTD. will shortly publish a new J- monthly journal devoted to the aircraft manufacturing in dustry. It will be entitled Aircraft Production. Those who are acquainted with The Automobile Engineer, the technical monthly journal dealing with production and works equipment in the automobile industry, will feel confi dent that the new journal will be thoroughly reliable from the engineering standpoint, and will be informative, instructive and well presented The contents will embrace works practice, airframe con struction and assembly, instrument design and layout, aero engine manufacture, machine tool and general equipment, pro duction of components (with special reference to light materials and alloys), as well as factory design and works organisation. In this new technical journal the various processes of manu facture and the materials involved, together with their characteristics, will be described by experienced engineers, while works equipment and plant, such as conveyors, electrical gear, gauging and testing apparatus, lighting, air condition ing and all essentials of a modern factory will also be covered. It will be essentially the journal for all directly and in directly engaged in, or associated with, the many branches of aircraft production, and will appeal to works directors, de signers, production engineers, managers of departments, section leaders, buyers, suppliers of materials, inspectors, and, in fact, all whose activities are connected mainly with the works side of aircraft production. Efficient production of aircraft is the problem of the moment. The aim of the journal will be to promote efficiency in the aircraft industry as a whole by co-ordinating design and pro duction and by disseminating the most modern ideas and methods in the repetition manufacture of aircraft. Gliding Contests' Auspicious Start THE National Gliding Contests, in which 29 sailplanes are competing at Dunstable this week, started auspiciously with an attempt on the world duration record for two-seater sailplanes, which stood at 21 hours 2 minutes, to the credit of Germany. Fit. Lt. W. B. Murray and Mr. Stanley Sproule were winch- launched in the Falcon III two-seater at 04.09 hours on Satur day, with two air cushions, a suitcase of food, and two books. The wind was good, but continual heavy rain showers made flying very unpleasant in the open machine, which had not • even a windscreen. In the evening they dropped a note saying they were hungry, so Fit. Lt. Shaw took up a G.B. sailplane with a packet containing food and an evening newspaper dangling on a length of string. He tried three times, but each time the two-seater's drag wires cut the string just out of reach, and the parcel was lost. As it grew dark, hurricane lamps were lit along the edge of the hill, supplemented by rows of spectators' car lamps. At 02.20 hours on Sunday morning, a signal was flashed to the sailplane that the record was beaten. At 02.22 hours,it made a perfect landing by floodlight, having been in the air for 22 hours 13J minutes. It was "a really magnificent effort, in spite of the miserable weather, and the fact that one of the pilots bud all but broken his leg two days before and felt very ill most of the ninrnihg. The competitions last until next Sunday, by which tunc, it is expected that, weather conditions permitting, new distance and altitude records will have been established. Arrangements have also been made abroad in case any pilots are able to soar across the Channel and land in France or Belgium.
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