The research reported in this paper has been carried out to investigate the effect of large bulbous bows on the resistance and propulsion of a ship. The basic shape of the investigated bulbs was a sphere, connected to the ship in such a way that the original hull form was maintained as much as possible.

    The basic ship was a fast cargo liner of 150 m (500 ft) length. Her trial speed corresponds to about V s / L f = 0.90 . The application of a bulb of conventional size and shape would not favourably affect the resistance in the speed range of interest. The application of a bulb based on a big sphere, however, did reduce the required power at equal speeds. For the ship under consideration this reduction was 8.9 per cent. at V s / L f = 0.90 .

    The size of the sphere, needed to reduce the bow wave system as much as possible, was determined by a simple approximative theory. The experiments concerned in the first instance the location of the sphere relative to the bow, the effect of a variation of the diameter of the sphere and of the angle of entrance of the water lines of the ship.

    When the ship was fitted with a large bulb faired into a more conventional shape, the resistance curve of the ship obtained the character of that of a ship one or two knots faster than the basic ship.

    Finally the effect of a bulbous bow was compared with the effect of small changes in the main dimensions of the ship.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Research on bulbous bow ships1


    Subtitle :

    Part I.A. Still water investigations into bulbous bow forms for a fast cargo liner


    Contributors:

    Published in:

    Publication date :

    1966-06-01


    Size :

    18 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Research on bulbous bow ships1

    van Lammeren, W.P.A. / Pangalila, F.V.A. | IOS Press | 1966


    Research on bulbous bow ships1

    Wahab, R. | IOS Press | 1966


    Research on bulbous bow ships -- 1.A

    van Lammeren, W.P.A. / Wahab, R. | Engineering Index Backfile | 1966


    Research on bulbous bow ships1

    van Lammeren, W.P.A. / Muntjewerf, J.J. | IOS Press | 1965


    Research on bulbous bow ships -- 2A

    Van Lammeren, W.P.A. / Muntjewerf, J.J. | Engineering Index Backfile | 1965