The task of completing this book was undertake n to fulfil an important technical need, as did the book, “Fluid-Dynamic Drag”. Upon reviewing the available material and notes of the late Dr. Hoerner on the subject of lift, we felt that his valuable and extensive work should be made available to the engineering community.

In working with Dr. Hoerner’s data, we have considered and incorporated recent technological advances and developments. In compiling and completing his work we have attempted to maintain his standards and technical excellence. His notes, completed chapters and extensive library provided the basic material needed to do this, and also have helped to preserve his ideas and expertise. Although considerable work had been done on the subject by Dr. Hoerner extensive studies and analysis were necessary to meld the vast store of material into a complete and useful book.

This book has been written for both the practicing engineer and the student. It is designed so that the physical aspects of the problem can be understood as wed as to provide solutions. The book is not just a collection of data but brings together and integrates the material to form as complete a picture as possible. The many sources of data used are given to provide material for any desired expanded studies.

Many people have cooperated in providing new sources of data for this book, including the many scientists of NA$A. Without their extensive help this book could not have been completed in its present form. We also want to thank Mrs. Hoerner for giving us the opportunity to complete the work of her late husband on the subject and for making available his extensive library, notes and data. Special thanks are also given to Mr. Ralph C. Cooper of the Office of Naval Research for his support in the final consummation of this work.

Although the basic and underlying work of the late Dr. Hoerner on fluid dynamic lift was done over a period of many years, the remaining chapters were written and the final review was completed during the last two years, к is hoped that this book fills an existing technical gap and will be useful over many years as an engineering resource.

Wayne, Pennsylvania

June, 1975 Henry V. Borst

This 1985 second edition differs from the proceeding one as follows: a number of mis­prints and some errors have been eliminated. New material has been added on cascade flow in Chapter II and in Chapter III new data on winglets and endplates. The improve­ments possible in section maximum lift with small changes in the upper surface contour are given in Chapter IV. Also in Chapter XII the theoretical characteristics of ducted fans has been expanded along with the effect of rotation on blade section characteristics.

Wayne, Pennsylvania

April 1985 Henry V. Borst

THE CO-AUTHOR graduated in aeronautical engineering from Rensselaer Polytechnic Institute in Troy, New York. He worked for the Curtiss Wright Corporation on research projects for many years and became Chief of Aerodynamics. During this time advanced work on propulsion systems was done and two new VTOL aircraft were developed, the X-100 and the X-19 for which he holds the basic patent. Later he joined the Vertol Division of the Boeing Company becoming Director of Preliminary Design. During his career he has written many technical papers of aerodynamics. He now heads the Henry V. Borst and Associates of Wayne, Pennsylvania, aeronautical consultants to government and industry.

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