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Aviation History
1932
1932 - 0017.PDF
FLIGHT, JANUARY 1, 1932 ^Ke hdq/trcj PETRO-FLEX TUBING 'ill \ ARLY experience with internal - IH _^ combustion engines soon III J showed the necessity for a new " conduit " for fuel, that would not be affected by constant vibration. Aircraft fuel systems re quire a tubing with many virtues, in cluding light weight, flexibility, dura bility, strength, and, while permitting an unimpaired flow, it has to remain impervious to any detrimental action of fuel. Petro-Flex tubing has obviously met these conditions if judged from its extensive adoption in aircraft alone. No rubber or rubber-treated material is used in this flexible tubing. It is constructed with an external armour ing, an outer wall, an inner armouring, and a core lining. Thus there are two walls. The inner wall, which carries the fluid, con sists of a natural product chemicallv treated, and is fitted in tubular forma tion, thereby eliminating lateral and transverse joints. The layers are of varying thicknesses to meet pressure and volumetric conditions. A canvas, specially woven, treated and proofed, is used for the outer wall, fitted longi tudinally to eliminate transverse joints. The texture and composition of the internal lining is such that the internal wire which forms the helicallv-wound armouring has practically to be em bedded in it, giving a smooth bore and unimpaired flow. This wire is true, to gauge and solid drawn to give the complete wetted surface a minimum of hydraulic resistance. For the external armouring the wire is of a similar nature, but is so fitted that, while lying well-housed in the tube convolution, it sits proud of the outer canvas, thus forming a protec tive armour against the possibility in service of damage from lough usage or chafing. As the internal and external armour ing are mechanically wound through gearing they are true to pitch, and there is no possibility of unequal stress or local binding when flexed in service. There are over 20 different sizes of Petro-Flex and two classes—Aircraft and Commercial. The inner petrol- resisting lining is similar in both classes, but the outer covering differs in specification and colour. Petro-Flex tubing is manufactured by Petro-Flex Tubing Co., Ltd., Cassiobury Works, St. Albans Road, Watford, and the OUTER WALL 2£!L^Jif °f aeril' nhoto£raPhs for mura» decoration is admirably demonstrated in this view of the new showroom of Aerofllms, Ltd., at Heston Air Port. These photographs are of course their own work. INNER ARMOURING sole selling agents are Hobdell, Way & Co., Ltd., 20, St. Clare Street, Minories, London, E.l. AN AUTOGIRO BULLETIN '"THE Cierva Autogiro Co., of Bush House, Strand, W.C.2, now issue a monthly bulletin which is very in teresting, and contains a large amount of informative matter concerning their products. All those who are in touch with this unorthodox machine should write for a copy, mentioning FLIGHT. MOTHS FOR BRAZILIAN ARMY "THE de Havilland Aircraft Co., Ltd., have recently concluded a contract with the Brazilian Ministry of War for 15 " Moth " type train ing aircraft for their 1932 programme. This has particular significance in the fact that these " Moths " are the first British aircraft to be placed in the Brazilian Army, and were allotted after comparison with seven other types put forward by four different nations. The new military training type " Moth " fulfils all the desideratum of economical training. The light and economical Gipsy engine of 120 h.p. EXTERNAL ARMOURING has a world-wide service organisation behind it, as the de Havilland over seas factories and agents hold adequate stocks of spare parts. The programme of Brazilian train ing includes night flying, " blind " flying, wireless operation, gunnery practice, bomb dropping and photo graphy, all of which duties may be accomplished on the 15 machines to be supplied by fitting the various military gear, as alternatives, when required. The machines will be equipped for inverted flying, which will be carried out also during display work, similar to the Royal Air Force at Hendon. It will, therefore, be seen that many new British units of equip ment also will be introduced into this important market, as, apart from the actual machines, cameras and wireless gear, etc., will be supplied from this country. The de Havilland Aircraft Co., Ltd., have also supplied similar machines recently to the Governments of Por tugal, Sweden, China, Iraq and Egypt. A.S.T. DEVELOPMENTS 0T CORE LI M INI C A TYPICAL OF PBTRO- SE-CTION FLEX |UT of the ordinary in brochures is the new issue by Air Service Training, Ltd. (of Hamble, Southamp ton), which gives very full details of all the courses of flying instruction to be had. Just published, it contains details of the Air Ministry flying tests under all categories. The type of in struction given at a school like this is probably unequalled anywhere in the world, and this view is borne out by the large number of pupils who have come from abroad. Particularly in teresting are the courses of instruction in night and blind flying, and those for flving instructors. 17
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