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Zinc‐Containing Duralumins: Earlier Restricted Use The zinc‐containing duralumins have been around for quite a long time now. However, it is only within the past two decades or so that they have played a major role in aircraft construction, their design use having been restricted by certain aircraft companies because of occasional unpredictable service performance. Accepting the fact that some of the earlier, high strength, aluminium‐zinc alloys had a marked susceptibility to stress corrosion, and that some structural failures were directly attributed to this, it is now an established fact that some real and concrete progress has been achieved in reducing this susceptibility and the status of the modern variants of these alloys, when used for aircraft design purposes, is no longer a question of doubt. The informative article “New High Strength Aluminium Alloy”, by H. A. Holl published in Aircraft Engineering, January 1975, records significant progress in this direction. It covers the successful, sponsored development of 7010, high strength, aluminium‐zinc alloy, by the British Ministry of Defence.

Tankfreight, one of the UK's largest third party bulk distributor which already has a significant share of the chemicals distribution market, has won a £3 million contract to move chemicals for Unilever company Vinamul which produces polymer emulsions for the adhesives, building, paint, paper and textile industries.

The Westland Lynx helicopter is a particularly fine example of the use of advanced fan technology in modern aircraft applications. The firm of Airscrew Howden have come a long way from their original manufacture of the wooden ‘prop’ but they still continue to play a very essential part in all types of aircraft flying today; this takes the form of sophisticated fan designs to cover a wide variety of special air‐movement requirements that can arise in this sector.