Investigation of the optimum longitudinal single transverse step location for a high-speed craft

Ahmet Gultekin Avci*, Baris Barlas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


One of the crucial aspects of the conceptual design of a stepped planing hull is the prediction of its performance. To improve performance, the prediction of total resistance must become more accurate. In the field of research, both towing tank experiments and numerical analysis may be used to achieve this goal. In this study, experiments were conducted initially to investigate total resistance of a relatively high-speed craft without a transverse step. Later, numerical computations were carried out to validate the experimental results. After it was determined that the test results and CFD methods were in good agreement, the experimental method continued to investigate the resistance properties of the hull with four different configurations to evaluate the optimal longitudinal position of a single transverse step. The ideal longitudinal position of the single transverse step was evaluated based on a similar relatively high-speed hull with a velocity of up to beam Froude number (FrB) 2.56 in this study, focusing on the FrB range between 2.30 and 2.45.

Original languageEnglish
Pages (from-to)47-70
Number of pages24
Issue number3
Publication statusPublished - 1 Jun 2023

Bibliographical note

Publisher Copyright:
© 2023, University of Zagreb Faculty of Mechanical Engineering and Naval Architecture. All rights reserved.


The authors would like to acknowledge the Ata Nutku Ship Model Basin staff at Istanbul Technical University for their assistance with the experiments. This study was partially funded by the ITU Scientific Research Projects Support Program under project ITU-BAP. The authors also appreciate Loça Mühendislik, the ship design company, for providing access to full-scale trial data.

FundersFunder number
International Technological University
Bilimsel Araştırma Projeleri Birimi, İstanbul Teknik Üniversitesi


    • CFD
    • planing hull
    • resistance
    • stepped hull
    • transverse step


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