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Aviation History
1943
1943 - 2840.PDF
62O FLIGHT DECEMBER A CASE FOR STANDARDISATION is boosted at ground level is readily comprehended.__^A.n ideal system for universal use, both in normal flying and in scientific work, should be based on fundamentalunits of convenient size. The most universally accepted fundamental unit of force being the dyne, and the corre-sponding unit of area the square centimetre, it would be • rational to adopt " dynes per square centimetre." It is perhaps fortunate that such an awkwardly namedunit is also of inconvenient size, being far too small for the purpose in view. Opportunity thus exists to choose a suit-able multiple of the " dyne per square centimetre " and to adopt a more reasonable name. _-Ihis step has, in fact, already been taken. Inmeteorology, units used are the "bar," one million dynes per square centimetre, and the "millibar," one thousanddynes per square centimetre. These measures are already in world-wide use, but for manifold pressure measurementthe most useful sized unit would be a "centibar" of ten thousand dynes per square centimetre. This is not actually a new unit, or even an old unit putto a new use, for manifold pressure gauges registering "centibars" are already in use. Unfortunately, however,this sound and useful unit has been inflicted with the of "pieze." There is~no doubt that standardisation of the units of manifold pressure measurement throughout the world wouldoffer real advantages to both pilots afld aeronautical engineers. My personal opinion is that the "pieze" or"centibar" is the most suitable unit for universal use, although there are alternatives which might also Legenerally acceptable. What is-really required is action to standardise somereasonable system before the end of the war and enforce- ment of its use. At the present time, the whole British aircraft industry.™is working for the Ministry of Aircraft Production, and the state of affairs in U.S.A. is very similar. Is it too muchto hope that the Air Forces of our two nations can agree on a standard manifold pressure measuring system andadopt it for all their aircraft? After the war, most of the world's aircraft will have to be supplied by Britain or theUnited States, and any system standardised by both would inevitably spread to other countries. If the Americans are unwilling to change their present'' inches of mercury '' gauges., then let us fall into line with them. Their choice of units is not ideal, but at least they*""*employ a scale of absolute pressures. The British boosK gauge with its arbitrary " zero " of 14.7 pounds per squareinch is an anachronism whirh should be thrown awav and forgotten. NATIVE WEAPON : Official secrecystill forbids anything like a useful description of the first single-seaterfighter to be designed and produced in Australia, namely the Boomerang.But from the picture showing a line- abreast formation of them high abovetheir native land, their resemblance to the Wirraway trainer (Australianversion of the Harvard trainer) will be noticed about the wing design, whilethe fin and rudder resemble those of the NA-25.Type of engine (beyond the obvious fact that it is an air-cooled radial),performance and armament- are" not disclosed, but it js-said to be heavilyarmed and tpu^tfssess goodjnanoeuvra- bility. I,0ftg-range drpfra^ks can becarried-'under the ppdtotyp/fcsign w MILITARY AIR LINE : Two photographs of the new air service run by the French military authorities between Damascus andMoscow. Teheran, the capital of Iran, is the main stopping place. Lockheed Lodestars are employed on the route.
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