AN INVESTIGATION INTO THE RESISTANCE COMPONENTS OF HIGH SPEED DISPLACEMENT CATAMARANS

This paper summarises an experimental and theoretical investigation into the resistance components in calm water of high speed displacement and semi-displacement catamarans with symmetric demihulls. Total resistance, running trim, sinkage experiments and wave pattern analysis based on multiple longitudinal cut techniques were carried out for a mathematically defined hull form (Wigley hull) and three round bilge hulls derived from the NPL series. The tests were conducted over a Froude number range of 0.2 to 1.0 and separation to length ratios of 0.2, 0.3, 0.4, 0.5, and infinity. Wake traverse analysis was also carried out for the Wigley model and one round bilge model. Interference effects for both the wave pattern and the viscous resistance components were derived. A theoretical method based on linearised wave resistance theory was developed, and examples of its application compared with experimental results. The results of the investigation provide a better understanding of the components of catamaran resistance including the influence of hull separation and length of beam ratio over a wise range of Froude numbers. Conclusions are drawn from the results of the interference effects on both wave resistance and viscous resistance, and practical applications of the results are described.

• Supplemental Notes:
  • Naval Architect, Jan 1992, p 1 [20 p, 23 ref, 1 tab, 24 fig]
• Authors:
  • Insel, M
  • Molland, A F
• Publication Date: 1992

Language

• English

Subject/Index Terms

• TRT Terms: Catamarans; Fluid resistance; Hulls
• Uncontrolled Terms: High speed vessels; Hull resistance
• Subject Areas: Marine Transportation; Vehicles and Equipment;

Filing Info

• Accession Number: 00702162
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM