PREFACE 



The Ninth Symposium on Naval Hydrodynamics continues in all aspects the 

 precedent, established by previous symposia in this series, of providing an inter- 

 national forum for the presentation and exchange of the most recent research re- 

 sults in selected fields of naval hydrodynamics. The Symposium was held in Paris, 

 France on 20-25 August 1972 under the joint sponsorship of the Office of Naval 

 Research, the Ministere d'Etat charge de la Defense Nationale and the Association 

 Technique Maritime et Aeroanutique. 



The technical program of the Symposium was devoted to three subject areas 

 of current naval and maritime interest. These subject areas are covered in the 

 Proceedings in two volumes: 



Volume 1 — The Hydrodynamics of Unconventional Ships 

 — Hydrodynamic Aspects of Ocean Engineering 

 Volume 2 — Frontier Problems in Hydrodynamics. 



The planning, organization and management of a Symposium such as this is 

 an undertaking of considerable magnitude, and many people have made invaluable 

 contributions to the resolution of the myriad of large and small problems which 

 invariably arise. The Office of Naval Research is acutely aware of the fact that the 

 success of the Ninth Symposium is directly attributable to these people and wishes 

 to take this opportunity to express its heartfelt gratitude to them. We are particu- 

 larly indebted to Vice Admiral Raymond THIENNOT, Directeur Technique des 

 Constructions Navales, Ministere d'Etat charge de la Defense Nationale, to Professor 

 Jean DUBOIS, Directeur des Recherches et Moyens d'Essais, Ministere d'Etat charge 

 de la Defense Nationale, and to Monsieur Jean MARIE, President de 1' Association 

 Technique Maritime et Aeronautique, who provided the formal structure which 

 made this joint undertaking possible. The detailed organization and management 

 of the Ninth Symposium lay in the capable and competent hands of Vice Admiral 

 Roger BRARD, President de la Academie des Sciences, and Rear Admiral Andre 

 CASTERA, Directeur du Bassin d'Essais des Carenes, who were most ably assisted 

 in this endeavor by the charming Madame Jean TATON. Throughout the long days 

 of planning and preparation the experienced and practical counsel of Mr. Stanley 

 DOROFF of the Office of Naval Research provided continuous guidance which 

 contributed in an immeasurable way to the success of the Ninth Symposium on 

 Hydrodynamics. 



RALPH D. COOPER 

 Fluid Dynamics Program 

 Office of Naval Research 



BIOLOGICAL 

 LABORATORY 



LIBRARY J 



1 WOODS H 



