PREFACE 
This Symposium is the third in a series, each of which has 
been concerned with various aspects of Naval Hydrodynamics. 
The first (held in September 1956) presented critical surveys of 
those areas of Hydrodynamics that are of significance in naval 
science. Subsequent meetings were to be devoted to one or more 
topics selected on the basis of importance and need for research 
stimulation, or of particular current interest. In keeping with this 
objective, the second symposium (August 1958) had for its dual 
theme the areas of hydrodynamic noise and cavity flow. 
Still continuing with the original plan, the present symposium 
selected for its theme the area of high-performance ships, thus 
emphasizing among other things the interest in the current prob- 
lems and latest accomplishments associated with hydrofoil craft 
and ground effect machines. 
The international flavor of these meetings has been preserved 
and, in fact, enhanced in the present case by virtue of the setting, 
the participation, and most particularly by the joint sponsorship 
by the Netherlands Ship Model Basin and the U.S. Office of Naval 
Research. 
The background, objectives, and hopes for this meeting are 
more than adequately described in the speeches of welcome by 
Professor Troost and Dr. Killian, the dedication address by Dr. 
von Karman, and the foreword to this volume by Professor van 
Lammeren. Little remains to be said other than to echo Profes- 
sor van Lammeren’s expressions of gratitude to all those who 
contributed so much to the success of this symposium. However, 
taking the liberty of speaking for both the Office of Naval Re- 
search as well as the international scientific community of hydro- 
dynamicists, I should again like to express our deepest apprecia- 
tion to Professor van Lammeren and the Netherlands Ship Model 
Basin for their efficiency and care in managing the many varied 
aspects of this symposium. 
RALPH D. COOPER, Head 
Fluid Dynamics Branch 
Office of Naval Research 
