TABLE OF CONTENTS 



Page 



LIST OF FIGURES iii 



LIST OF TABLES iv 



NOTATION v 



ABSTRACT 1 



ADMINISTRATIVE INFORMATION 1 



INTRODUCTION 1 



BASIC CONSIDERATIONS 2 



DESCRIPTION OF EXPERIMENTAL EQUIPMENT 5 



DESCRIPTION OF INSTRUMENTATION 13 



EXPERIMENTAL ARRANGEMENT AND PROCEDURES 14 



RESULTS AND DISCUSSION 14 



CONCLUSIONS 21 



REFERENCES 21 



APPENDIX A - A COMPARISON OF THE HYDRODYNAMIC LOADING FUNCTIONS WITH 



SOME CRITICAL ANGLE TOWING DATA 22 



LIST OF FIGURES 



1 - DTNSRDC Depressor 7 



2 - Dimensions of DTNSRDC Depressor 7 



3 - Depressor Performance as a Function of Speed 9 



3 (a) -Cable Angle at the Depressor; 3(b) -Cable Tension at the 

 Depressor 



4 - Ribbon Towcable 11 



5 - Schematic Diagram of the Towing Arrangement 15 



6 - Cable Tension at the Ship as a Function of Cable Scope 16 



7 - Depressor Depth as a Function of Cable Scope 17 



8 - Hydrodynamic Loading Functions 18 



8 (a) -Normal Hydrodynamic Loading Function vs Cable Angle; 

 8(b) -Tangential Hydrodynamic Loading Function vs Cable Angle 



9 - Drag Coefficient C as a Function of Reynolds Number 19 



K 



A.l- Towcable Tension per Unit Length versus Towspeed for 



Various Towcables 23 



A. 2- Towing Angles versus Towspeed for Various Towcables 23 



A. 3- Tangential Hydrodynamic Loading vs Cable Angle 27 



iii 



