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Aviation History
1940
1940 - 1461.PDF
MAY I5, 1940 455 THE "O/400" TRADITION (CONTINUED FROM PACE b guessed 250-260, expecting quite a mild zoom to follow. Certainly we were not counting on such a sharp tilting of the horizon and such rapid contraction of the aero- drome below our tail. Toward the end of the zoom we looked out at the automatic slats, half expecting them to open, but they stayed closed. Back in one of the crew rooms where pilots and navi- gators are '' briefed '' the Group Captain pointed out that the Hampden is not only capable of delivering heavy punishment but can take it in large doses if the occasion arises. A number of these machines have glided down out of the North Sea mists bearing some bad scars which, on less sturdy machines, might have been fatal wounds. On one occasion when a Hamp- den formation encountered a bunch of Messerschmitts the Me's opened up with their shell-guns. One projec- tile entered the pilot's enclosure just behind his head and went out through the Perspex, leaving a hole the size of a teaplate. A second came in at a different angle with similar results. Point will be lent to this story if the pictures which show the over-all size of the enclosure are examined. As we were taking leave of the Wing Commander he received a "met" report promising clouds at 800ft. by dark. So he made the evening exercise low-bomb- ing practice. A RUMANIAN RADIAL THE first 1,000 h.p. aero engine to be produced inRumania, the I.A.R. i,ooo-A, has just beenannounced. It is a 14-cylinder two-row radial air- cooled unit, and is available in two forms—supercharged to give its rated h.p. at 12,460 ft. or at 10,500 ft. The crankcase consists of five main parts bolted to- gether. The main casing, forged from light alloy, carries the cylinders, and has the front casing and manifold casing bolted to it, while, in turn, the reduction gear casing and rear cover are bolted to these. The seats for the crank- shaft roller bearings are made from aluminium bronze pressed in hot and the crankshaft is made from forged Ni-Cr-Mo steel in three parts. A driving hub is situated at the rear of the crankshaft to operate the accessories mounted on the rear cover. Dogs are provided to engage with the I.A.R. (Eclipse licence) inertia starter, which may be operated either electrically or by hand. The two main connecting rods are made in one piece from forged Cr-Ni-Mo steel, being of double T section tapered towards the little end. The secondary connecting rods are of the same section, but are not tapered. The forged light alloy pistons are of an improved type, having free movement for the gudgeon pins, which are held in place by two spring steel clips. The cylinders are made of special forged chreme alloy steel, and are screwed into the heated cylinder heads, which are made of light alloy. Each cylinder has two valves, one inlet and one exhaust, the exhaust valve being sodium cooled. The valves are connected to the cams by means of roller tappets, push rods and valve rockers fitted with needle rollers and oiled under pressure. One automatic Zenith carburetter is mounted in front of the supercharger, which is of the centrifugal type. The fuel supply is controlled by two I.A.R. pumps on the rear cover. Ignition is provided by two Bosch magnetos revolving at J engine speed. Two sparking plugs are pro- vided for each cylinder. The engine is lubricated under pressure by gear pumps, the main pump providing high-pressure lubrication of im- portant points, such as connecting-rod bearings, tappet gear, cams, rocker gear, reducing gears and supercharger The 1,000 h.p. I.A.R. gears, while the other serves to circulate the oil throughthe radiator. The more important data concerning this engine are as follows: bore, 146 mm.; stroke, 165 mm.; capacity, 28.7 litres; compression ratio, 6 and 6.1 ; maximum take-off power for 3 min., 1,140 h.p.; normal take-off power, 1,005 h.p.; rated power, 1,020 h.p. at 10,500ft. and 12,500ft.; fuel consumption, 0.64 lb. per h.p./hr.; diameter of engine 49.88in.; length, without airscrew hub, 62.1m.; weight (in service condition), 1,466 lb. The engine is said to be adaptable to series production and is at present in use on I.A.R.39 and I.A.R.80 aircraft. Aer Lingus Traffic Increases INCREASING tendency to travel by air between Eire and -«- Great Britain is eyident from the traffic returns of Aer Lingus, Teoranta (Irish Air Lines) since the inauguration of the Dublin-Liverpool service on October 23, 1939. Aer LiHgus are to be congratulated on the fact that for the period under review a total of 2,893 passengers were carried by the company on this service. War has, if anything, assisted to awaken people's minds to the vast possibilities of air travel in general and the company does not, of course, intend to allow ttm increased opportunities for extra business occasioned by the war to pass by its doors. The demand for accommodation on the Dublin-Liverpool service has surpassed all expectations, and though extra machines have been pressed into service, and even duplicate services run, the demand keeps growing. The possibilitv of procuring larger aircraft has for some time been receiving the attention of the management and an announcement on this matter may be expected almost immediately. Lockheed Lodestar Sales HPHE recently announced order of 16 Lodestars lor South J- African Airways is augmented by three other orders to raise the total to 25. Air France and Regie Air Afrique, operating from Marseilles down through the Belgian Congo to Madagascar, will take three each. D.E.T.A., which is a Portu- guese-East Africa service from Lorenzo Marques to Port Amelia, has also ordered three.
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