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REPORT DOCUMENTATION PAGE 



READ INSTRUCTIONS 

 BEFORE COMPLETING FORM 



1. REPORT NUMBER 



DTNSRDC-81/012 



2. GOVT ACCESSION NO. 



3. RECIPIENT'S CATALOG NUMBER 



4. TITLE rand Subtitle) 



OPERATION AND HYDRODYNAMIC EVALUATIONS OF A 



CONTROLLED-DEPTH TOWED DEPRESSOR DESIGNED 



TO HOUSE A CONDUCTIVITY, TEMPERATURE, 



DEPTH (CTD) INSTRUMENT SYSTEM 



5. TYPE OF REPORT 4 PERIOD COVERED 



6. PERFORMING ORG. REPORT NUMBER 



7. AUTHORrs; 



R. Knutson 

 R. Singleton 



8. CONTRACT OR GRANT NUMBERC»; 



9. PERFORMING ORGANIZATION NAME AND ADDRESS 



David W. Taylor Naval Ship Research 

 and Development Center 

 Bethesda, Maryland 20084 



10. PROGRAM ELEMENT. PROJECT, TASK 

 AREA a WORK UNIT NUMBERS 



N6230678P085023 

 Work Unit 1548-801 



n. CONTROLLING OFFICE NAME AND ADDRESS 



Naval Oceanographic Office, NSTL Station 

 Bay St. Louis, Mississippi 39522 



12. REPORT DATE 



March 1981 



13. NUMBER OF PAGES 



88 



U. MONITORING AGENCY NAME ft ADDRESSfJ/ d(//eren( from Controlling Otilce) 



Naval Oceanographic Office, NSTL Station 

 Bay St. Louis, Mississippi 39522 



15. SECURITY CLASS, (ol this report) 



UNCLASSIFIED 



15a. DECLASSIFI CATION/ DOWN GRADING 

 SCHEDULE 



16. DISTRIBUTION ST AT EMEN T fo/ (h(s ReporO 



APPROVED FOR PUBLIC RELEASE: DISTRIBUTION UNLIMITED 



17. DISTRIBUTION STATEMENT (ol the abstract entered In Block 20, II dlllerent from Report) 



18. SUPPLEMENTARY NOTES 



19. KEY WORDS (Continue on reverse aide II necessary and Idenllly by block number) 



Towed Body 

 Control System 

 Oceanographic Survey 



20. ABSTRACT (Continue on reverse side II necessary and Idenllly by block number) 



A controlled-depth cable-towed depressor designed to house a conductiv- 

 ity, temperature, depth (CTD) instrument system is described. Design con- 

 siderations are discussed, and the results of basin and preliminary at-sea 

 evaluations conducted to ensure hydrodynamic performance are presented. The 

 evaluations indicate that the basic design objectives were satisfied. De- 

 tailed hydrodynamic performance predictions as well as operation and main- 

 tenance guidelines are included in Appendices. 



DD ,:$ 



1473 



EDITION OF 1 NOV 65 IS OBSOLETE 



S/N 0102-LF-014-6601 



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