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REPORT DOCUMENTATION PAGE 



READ INSTRUCTIONS 

 BEFORE COMPLETING FORM 



1 REPORT NUMBER 



DTNSRDC Report 77-0065 



2. GOVT ACCESSION NO. 



3. RECIPIENT'S CATALOG NUMBER 



4. TITLE (and Subtitle) 



DRAG, FLOW TRANSITION, AND LAMINAR SEPARATION 



ON NINE BODIES OF REVOLUTION HAVING 



DIFFERENT FOREBODY SHAPES 



5. TYPE OF REPORT & PERIOD COVERED 



6. PERFORMING ORG. REPORT NUMBER 



7. AUTHORS 



John L. Power 



8. CONTRACT OR GRANT NUMBERfs; 



9. PERFORMING ORGANIZATION NAME AND ADDRESS 



David W. Taylor Naval Ship Research 

 and Development Center 

 Bethesda, Maryland 20084 



10. PROGRAM ELEMENT. PROJECT, TASK 

 AREA 4 WORK UNIT NUMBERS 



SF 434 215 1Z, 1-1520-004 and 

 SSL66007, 1-1552-135 



11. CONTROLLING OFFICE NAME AND ADDRESS 



12. REPORT DATE 



December 1977 



13. NUMBER OF PAGES 

 58 



14. MONITORING AGENCY NAME a ADDRESSfff dltlerenl trom Controlling Office) 



15. SECURITY CLASS, (of this report) 



UNCLASSIFIED 



15«. DECLASSIFI CATION/ DOWN GRADING 

 SCHEDULE 



16. DISTRIBUTION ST ATEMEN T (of this Report) 



APPROVED FOR PUBLIC RELEASE: DISTRIBUTION UNLIMITED 



17. DISTRIBUTION STATEMENT (of the abstract entered in Block 20, It different from Report) 



IB. SUPPLEMENTARY NOTES 



19. KEY WORDS (Continue on reverse side If necessary and Identify by b/oc* number) 



(U) Turbulence Stimulation (U) Drag 



(U) Transition (U) Submarines 



20. ABSTRACT (Continue on reverse side If necessary and Identity by block number) 



Resistance has been measured of nine bodies of revolution, having equal volume but varying forebody 



shapes. Forebody shapes ranged from extremely blunt to extremely fine and included two that were flat faced. 



The forebodies were altered by changing their length-to-diameter ratios (L/D's) and prismatic coefficients. 



Drag results indicate that when the prismatic coefficient is fixed and the L/D is decreased, the residual 



resistance will increase modestly. Increasing the prismatic coefficient at small L/D's increases residual resistance; 



however, at moderate L/D's it does not. The results suggest that a flat -faced shape in itself does not increase 



resistance. ,_ . , ., N { 



(Continued on reverse side) 



DD ,2 



EDITION OF 1 NOV 65 IS OBSOLETE 



S/N 0102-LF-014-6601 



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