Crest of the Royal National Institution of Naval Architects - Click to return to the homepage


MarintechChina Until June 2022

Hybrid Expo

SMM May_June 2022


International Registries May 2022

Air Products May 2022


Paper Title: A Theoretical Method To Explore The Influence of Free Roll Motion On The Behavior of a High-Speed Planing Vessel Through a Steady Yawed Motion



S Tavakoli, Amirkabir University of Technology, Iran

A Dashtimanesh, Persian Gulf University, Iran

S Mancini University of Naples "Federico II", Italy


This paper introduces a theoretically-based method to compute the behaviour of a planing hull in a steady yawed motion when it is free to roll. This method was developed by using 2D+T theory and the oblique-water entry of an asymmetric wedge. Sectional forces were determined using added mass theory. The forces and moments acting on the boat were computed by extending the sectional forces in the longitudinal direction. Trim angle and centre of gravity (CG) rise were found by solving the motion equations for the rigid body of the vessel. The results were compared against experimental data, and suggest that the current method has reasonable prediction accuracy for these parameters. Moreover, cases of free-to-roll and fixed-in-roll were determined and compared against each other, indicating that the trim angle of a boat is reduced, while CG rise increased in free roll.


Transactions RINA, Vol 160, Part B2, International Journal of Small Craft Technology, Jul-Dec 2018 

DOI Number

DOI No: 10.3940/rina.ijsct.2018.b2.213

Search and Order IJSCT papers

All International Journal of Small Craft Technology (IJSCT) papers are listed in the RINA Publications Database. You can search the database by author name and paper title. Publications may be ordered and paid for online. Other publications are also listed, some of which may be downloaded free of charge. Follow the link to Search Publications & Order.

RINA membership

Cyber Security On Demand Button


Teinbridge Propeller

Euronaval Apr - Oct 2022

Uni Stratchclyde June 2021

Metstrade May 2022