DRAG REDUCING COATINGS FOR SHIPS HULLS
Recent efforts in the marine coatings industry have been centered on attempts to control skin friction or surface roughness on ships hulls. The Author describes various methods such as high molecular weight water-soluble polymers, hydrophilic coatings, and polishing surfaces. A major difficulty associated with the development of drag reducing systems is the fact that boundary layer configuration and turbulent structures similar to a full size ship cannot be easily obtained in a laboratory. The pros and cons of the following test methods are discussed: rotating cylinders, spinning discs, ship models towed in water channels, and friction plane tests. It is concluded that these methods can provide indications, but that the best type of test is full scale ship trials. The various problems encountered in an accurate ship performance registration system are presented and some practical results with a hydrophilic topcoat are shown.
- Paper presented at 8th Skandinaviska Lackteknikers Forbund Congress, in Helsinki, September 29- October 1, 1976.
Skandinaviska Lackteknikers Forbund CongressHelsinki, Finland
- Johnsen, S
- Publication Date: 1976
- Features: References;
- Pagination: 29 p.
- TRT Terms: Coatings; Drag; Hulls; Roughness; Skin friction
- Old TRIS Terms: Coating performance; Drag reduction; Hull roughness
- Subject Areas: Marine Transportation; Materials; Vehicles and Equipment;
- Accession Number: 00159965
- Record Type: Publication
- Source Agency: British Ship Research Association
- Files: TRIS
- Created Date: Sep 20 1977 12:00AM