CAUTIONARY NOTE

It must be emphasised that at Re below 500,000 boundary layer flows and separation bubbles are very complicated and up to the time of writing, mathematical and theoretical analysis has not been able to deal adequately with them.

Since the first edition of this book was published in 1978, a great deal of research of both theoretical and practical kind has been done. Leading roles in this have been taken

by universities at Stuttgart and Brunswick (Germany), Delft (Netherlands), Southampton and Cranfield (U. K.) and Notre Dame (U. S.A.), with other important contributions by

S. J. Miley and R. H. Liebeck, and D. Somers and S. M. Mangalam at NASA, where Walter Pfenninger also has worked for many years. Many of the most significant results were presented in the form of papers and summaries in academic journals, and at conferences, especially one at Notre Dame in 198S and a larger international meeting at the Royal Aeronauticid Society in London in October 1986. Although often of a highly technical and mathematical kind, many of these reports contain information of great significance for model fliers and should be consulted for detailed information on specific points. (See the list of references following Chapter 10). Some of the work remains unpublished or is available only from technical libraries or direct from the university departments concerned.