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Aviation History
1935
1935 - 1380.PDF
t)24 FLIGHT. JUNE 6, 1935. The Industry (contd.) SEA AND AIR When the National Benzole Company's new coastal tanker, the M.V. Ben Oliver, was launched at Colchester recently Mr. J. Scoles circled overhead in the company's aeroplane. HYDRAULIC FLAP OPERATION AT least twenty different types of aeroplane in this country and on the Continent are employing the Dowry flap- operating equipment. This utilises an hydraulic system con sisting essentially of a pump, control valve, and jacks. The standard hydraulic pump, which also forms a reservoir, is mounted in the cockpit and operated by hand. It is possible to adjust the length of the handle to suit the needs of different machines. The body consists of Elektron castings, and the complete pump unit weighs 3jlb. In the control box the direction of the flow of oil for raising or lowering the flaps is changed; this unit is also provided with a release valve lor limiting the maximum flap load. At any predetermined load the relief valve will open by passing the oil to the reservoir so that the flap folds into the wing. In the event of a pipe line fracturing, the jack concerned is auto matically locked in position: the flap, therefore, is held with perfect rigidity, but it is possible by operating through the remaining pipe to complete the operation if desired. A typical jack would be of one-piece duralumin construction, with moving parts chromium-plated to lessen friction and to protect the surface against corrosion. In the case of flaps where the load is progressive during lowering it is possible to connect the jacks on both sides of the aeroplane to a common power supply. When the flaps are balanced, or are of such construction that the load on a flap "changes sign" during operation it is necessary to provide a system which ensures equal distribution of oil to each jack. In this case a special control unit is provided. The weight of a complete set of flap-control gear for a machine of g.ooolb. weight is approximately rolb. The three principal com ponents of the Dowry flap-operating gear : the hand-operated hydraulic pump, the control box and one of the jacks. AIR POST STAMPS By DOUGLAS ARMSTRONG Air Train Stamps T HE latest development in aerial navigation, the glider train, is associated with the overprinting of a small supply of contemporary Cuban air mail stamps (of the international series) with the three-line inscription "PRIMER TREN AEREO INTERNACIONAL 1935—O'Meara y du Pont x 10 cts." These stamps were used to defray postage upon a special mail despatched on May 5 from Havana to Miami by an air train composed of an aeroplane with two gliders in tow, the surtax of 10 centavos being a contribution toward the cost of the experiment. The overprinted stamps were put on sale nine dajrs earlier—on April 26—and were immediately the objects of wild speculation, stamp dealers and others queuing up at the post office to obtain their supplies, which were promptly put up to a premium of thirty-three and one-third per cent. There are two varieties of this novel air mail stamp, the ordinary perforated 10-cenravos stamp of which 25,000 copies were so treated for the occasion and a further 10,000 issued imperforate. Amelia Earhart Stamp Another air stamp novelty hails from Central America, in the form of a special issue dedicated to the United States aviatrix, Miss Amelia Earhart, by the Mexican Government in recognition of her recent goodwill flight from New York to Mexico City and back. It takes the form of the present 20-centavos Mexican air mail stamp bearing an additional over print in violet ink which reads: "AMELIA EARHART—• VUELO DE BUENA VOLUNTAD—MEXICO 1935." Out of a total of 780 copies which received this imprint 480 were forwarded to the Berne Bureau of the Universal Postal Union for purposes of record and about 100 affixed to letters carried on the return non-stop flight to New York, leaving only 200 unused specimens available to air-mail collectors. It is further stated that the majority of these were cornered by an American on the spot, with the result that they are now quoted on the New York stamp mart at $175 apiece. Dominica's Latest A highly original and effective design graces the new 10- centavos air mail stamp of the West Indian republic of Santo Domingo, better known as the Dominican Republic; the stamp made its debut on April 29 last. In traverse rectangular format it presents a composite and impressionist picture of a bird superimposed upon an aeroplane against a background formed by a shadowy picture of a giant monoplane. The words " Correo Aereo" appearing in the upper right-hand corner denote the particular character of the stamp, which is printed in contrasting shades of light and dark blue. New Canadian Air Stamp Included in a complete new series of postage stamps that has just been taken into use by the Canadian post office is a 6 cents denomination reserved exclusively for the air mail service printed in brown-lake with a classical picture of Daedalus, the father of Icarus, soaring on waxen wings above the Aegean Sea. More Sudanese Aeros The theory advanced in this column last month that the Anglo-Egyptian Sudan might shortly abandon the issu'ana of distinctive stamps £oj air-borne correspondence was apparently unfounded. On the contrary, it transpires that when supplies of the recent provisional surcharges are exhausted they will give place to air stamps of equivalent face value but in the permanent design. Ten thousand copies each were pro vided of the ~]\ and 10 piastres surcharges on the obsolete 4J p>- S.C.A.D.T.A. Remainders Destroyed Collectors of the ever-popular Columbian air mail stump? issued under the auspices of the S.C.A.D.T.A. concern may be interested to learn that a considerable "remainder" stock that has lain in the company's vaults ever since the air mail service became a Government monopoly was officially destroyed early in the present year, with the exception of some thirty sets retained for reference. The Air Mail Society Another highly successful meeting was held on May 22, 'h* President, Dowager Viscountess Downe, being in the chair A most interesting account of the first aerial posts carried out experimentally at Allahabad (India), and later between London and Windsor, in connection with the King's Coronation in i9Tl was given by Commander Sir Walter Windham, Kt., R.N-. who organised them. During the evening it was announced that Lord Waketiel'l of Hythe had accepted office as a vice-president of the -4'r Mail Society.
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