The report describes the research conducted at MIT on bulbous bow retrofits applied to two New England type trawler hulls of 76 and 119 foot overall length. A 4.5' model of each hull was constructed and a series of twelve cylindrical-type bulbous bow retrofits were prepared for each. Calm water model resistance tests were conducted on the bare hull and then with each retrofitted bulb. All tests were done at constant draft, i.e., the bulb configurations were of heavier displacement than the original hull. The calm water results were compared at steaming speeds and a 'best' bulb was selected for seakeeping tests. The bare and bulbous models were then tested in regular waves over a range of wave lengths at both steaming and trawling speeds. Pitch, heave, bow accelerations, and resistance were measured. In the tests, all bulbs were fitted to the maximum limits of the forward draft and were aligned parallel to the waterlines. Variations in bulb diameter and length were studied. The results presented show the effect of these parameters on hull performance.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Tow Tank Results of Bulbous Bow Retrofits on New England Trawler Hulls


    Contributors:

    Publication date :

    1985


    Size :

    47 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English





    Development of parent hulls for high displacement-length series of trawler forms

    Ridgely-Nevitt, C. | Engineering Index Backfile | 1963


    Trawler design

    Munro-Smith, R. | Engineering Index Backfile | 1961


    Results of experiments upon bulbous bows

    Bragg, E.M. | Engineering Index Backfile | 1930


    Steam trawler "Andanes"

    Engineering Index Backfile | 1950