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A description of how oxygen pressure vessels for the prototype B.A.C./Sud Concorde are manufactured from seamless steel tubing produced by the Weldless works of Tubes Limited and an outline of the salient features of the Concorde's oxygen system for crew and passengers. On February 28, 1968—just fourteen months hence—the first prototype Concorde supersonic airliner (FIG. 1) will make its maiden flight from the Toulouse‐Blagnac airfield in France. Six months later the second prototype will make its first flight from British Aircraft Corporation's airfield at Filton, Bristol. In September 1969, and November 1969, respectively, two pre‐production aircraft will fly for the first time—these having a longer fuselage, higher gross weight, additional fuel capacity and higher payload capacity than the prototype aircraft. Apart from the fact that the pre‐production types will carry full flight test instrumentation, they will be fully representative of production Concordes—60 of which have already been ordered for service with thirteen leading world airlines.

The Chromalloy American Corporation have recently acquired a sub‐licence from Rolls‐Royce Limited for the use of the Bristol Aerojet Limited Tribomet composite electro‐plating process, which is already used by Rolls‐Royce in the U.K. and Canada.

Covina, and Robert L. Noland, Duarte, Calif., assignors, by mesne assignments, to Aerojet‐General Corporation, Cincinnati, Ohio. Application April 15, 1949.

This paper aims to provide an overview of current and historical arcjet development. The reviewed arcjets are considered with respect to both design and thruster relevant parameters. Correspondingly, the paper enables the identification of adequate design criteria and of the probable thruster parameters.

The approach consists of a database for thruster relevant parameters in conjunction with relevant operational requirements (such as type of propellant) and specific design criteria (such as e.g. propellant injection systems).

The synopsis of both operational parameter and respectively assigned design allows for the derivation of development approaches for arcjets under given high level requirements such as power regime.

The paper is a general review. However, its strength is in the synthesis of the arcjet classification, the functional evidence of design criteria and the application scenario.

Not only basic but also specific design criteria are analyzed and evaluated leading to a recommendation feature of the paper with respect to the overall design of adequate arcjets.

Within the scope of the Clean Space initiative, new applications and scenarios from the operation of arcjets arise enabling EOL phases of spacecraft that fulfill respective levels of debris mitigation and, in addition, the requirements concerning the adequately adapted re-entry of spacecrafts that are at end of life.

The paper is a general review. However, its strength is in the synthesis of the arcjet classification, the functional evidence of design criteria and the application scenario.

THE Deutsche Luftfahrtschau, or as it is more generally known, the Hanover Air Show, held every two years by the Bundesverband der Deutschen Luft‐ und Raumfahrtindustrie e.V. (Federal Association of the German Air and Spacecraft Industries). This year's Show will be held from April 26 to May 5 at the Hanover Langenhagen Airport and will be held at the same time as the famous Hanover Fair.

IN aircraft engineering as in other industries it is often necessary to make use of open process tanks. Such tanks are generally at elevated temperatures and are both inefficient and unpleasant to work with. Not only arc they a major source of heat and evaporation losses, but they frequently produce corrosive or noxious vapours which rapidly attack any neighbouring surfaces and may be a hazard to health.