The objective of the work was to produce model data to aid in the evaluation of the effect of different ballast displacements on seakeeping behavior of a typical 250,000 DWT tanker. A series of tests were made at three headings in long-crested irregular waves of two levels of severity. Additional parametric variations included four model displacement conditions and two speeds. Heave motions were of lower magnitude than would in general be expected. The most violent longitudinal motions occurred in bow seas. In general, the influence of ballast condition on motion magnitudes is not large. The incidence of propeller emergence appears worst in bow seas. Similarly, the effect of forward draft on keel emergence and the incidence of re-entry velocities greater than 17 ft/sec is very strong. It is apparent from the head sea relative motion results that the model was on the verge of supercritical operation in the model seas. This is important from the point of view of data interpretation and eventual design conclusions. (Author)


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    Seakeeping Tests of a 250000 DWT Tanker Model in Various Ballast Conditions


    Contributors:

    Publication date :

    1973


    Size :

    45 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




    Initial Seakeeping Tests on an IACC Yacht Hull Model: Two Ballast Conditions

    Cohen, S. B. / Beck, R. F. / National Research Council; Naval Studies Board | British Library Conference Proceedings | 1993


    Seakeeping assessment for a 12000tdw oil tanker

    Sandita Pacuraru / Silviu Perijoc | DOAJ | 2015

    Free access


    Fliegende Blätter: 250000

    DataCite | 1856

    Free access

    Investigation on seakeeping performance of an oil tanker on regular waves

    Bianca Elena Roșca / Săndița Păcuraru | DOAJ | 2022

    Free access