Philip K. Lawrence, Director, Aerospace Research Group, University of the West of England, Bristol, UK. Derek L. Braddon, Associate Director, Aerospace Research Group, University of the West of England, Bristol, UK. Contributors: Keith Hayward, Carmelo Cosentino, David W. Thornton, Adolf Revuelta, Robert Whitfield, Helmut Schmitt von Sydow, Michel Bieler, Peter Bruce, Horst Prem, Iain G. Gray, Mike J. Goulette, Air Vice-Marshall Peter Norriss, Dieter Schmitt, Group Captain J.K. Newton, Steven McGuire.