Aims and scope The aims and scope of The Aeronautical Journal are intended to refl ect the objectives of the Royal Aeronautical Society as expressed in its Charter of Incorporation. Briefl y, these are to encourage and foster the advancement of all aspects of aeronautical and space science. Thus the topics of The Aeronautical Journal include most of those covered by the various Specialist Groups of the Society, which include: Aircraft design, aerodynamics, air law, air power, air transport, air

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... navigation, airworthiness and maintenance, aviation medicine, avionics and systems, environmental issues, fl ight operations, fl ight simulation, fl uid dynamics, fl uid mechanics, general aviation, guided fl ight, human factors, human powered fl ight, light aviation, management studies, propulsion, rotorcraft, safety, space, structures and materials, structural mechanics, systems and test procedures and UAVs. Papers are therefore solicited on all aspects of research, design and development, construction and operation of aircraft and space vehicles. Papers are also welcomed which review, comprehensively, the results of recent research developments in any of the above topics. We recognise the inhibiting pressures of time and confi dentiality and acknowledge that many of the design testing, manufacturing and operational problems that industry has to solve contain important information for the whole aerospace community.