Tug design has changed considerably during the last ten years and the Author first draws attention to some practical details, as distinct from technological matters, that can help to improve the operating efficiency. He also makes some comparisons between American and European practice. Accommodation and hull arrangements should be designed with crew comfort as a prime consideration; for example, the galley should be as far aft as possible to reduce the effects of pitching. The minimum cabin areas recommended for 1 to 4 occupants in different types of service are tabulated. If properly designed, a moulded (round bilge) hull is preferable to a chined hull, except for small tugs and work boats. Practical considerations favour moulded hulls for overall lengths of 150- 250 ft, multi-chin bulls for 60-200 ft, and single-chine hulls up to about 90 ft; the final choice, however, depends on the duties the tug will be required to perform. The preferred shape for the midship section is one having a vertical sheerstrake above a heavily-fared lower strake below the waterline. Recommended thickness for this sheerstrake, for the bottom plating in way of screws, and for the rest of the hull are shown in a graph. These thicknesses relate to steel, which the Author recommends as a hull material; aluminum should not be used for this purpose except when weight or draught is of prime importance.

  • Supplemental Notes:
    • Proceedings of Fourth International Tug Convention, New Orleans.
  • Corporate Authors:

    International Tug Convention (4th)

    New Orleans, LA  United States 
  • Authors:
    • Guarino, S J
  • Publication Date: 1975-10-20

Media Info

  • Pagination: 7 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00153096
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: May 11 1977 12:00AM