DETERMINATION OF THE RESISTANCE OF FAST ROUND BOTTOM BOATS WITH CHINE IN THE ZONE OF THE AFTERBODY

The power performance of high speed, semi-displacement round bilge hulls can be improved by replacing the round bilge, before the transom, with a hard-chine. To investigate the influence of that position of the hard-chine on resistance, wetted surface and running trim, three models, conforming to the NPL-High Speed Round Bilge Displacement Hull form, but with different length-to-beam ratios, were tested. By applying the hard-chine, the resistance of all three models decreased. A significantly greater reduction in resistance was obtained by additionally applying two overlapping spray rails and a transom wedge. On the basis of the test results, a simple procedure for correcting the residuary resistance, the wetted surface and the running trim of the NPL Hull Series was developed.

• Supplemental Notes:
  • Report; Vol.1-Main Report; Vol.2-Statistical Tables
• Corporate Authors:

  Versuchsanstalt fur Wasserbau und Schiffbau

  Berlin,   Germany 

  Forschungszentrum des Deutschen Schiffbaus

  Hamburg,   Germany 
• Authors:
  • Schwanecke, H
  • MULLER-GRAF, B
• Publication Date: 1985-7-15

Language

• German

Media Info

• Features: References;

Subject/Index Terms

• TRT Terms: Artificial satellites; Fluid resistance; Hulls
• Uncontrolled Terms: Hull resistance; Model tests
• Old TRIS Terms: Afterbodies; Chines; Displacement hulls; Hull bottoms
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00654062
• Record Type: Publication
• Source Agency: Maritime Technical Information Facility
• Report/Paper Numbers: 979/85
• Files: TRIS
• Created Date: Jul 21 1994 12:00AM