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



Marintec_New_July_December 2022


Palfinger August 2022

IJME 234

Paper title: On the Macro Hydrodynamic Design of Highly Efficient Medium-Speed Catamarans with Minimum Resistance



M Haase, J Binns, G Thomas and N Bose, Australian Maritime College, University of Tasmania, Australia
G Davidson, Revolution Design Pty Ltd, Australia, S Friezer, Stuart Friezer Marine Pty Ltd, Australia 


A new class of fuel-efficient and environmentally friendly twin-hull vessels is currently under development. Compared to high-speed catamarans, a significant reduction in speed combined with an increase in deadweight tonnes will lead to a highly efficient medium-speed catamaran design. Recently-built conventional and high-speed ferries are compared to each other in terms of length, speed, deadweight and transport efficiency to classify the new design. The goal of this study is to find a preliminary macro design point for minimum total resistance by considering the main particulars of the catamaran vessel: block coefficient, prismatic coefficient and slenderness and separation ratios of the demihulls. Publications containing recommendations towards the optimum hull form parameters for moderate Froude numbers are reviewed and existing experimental data analysed to identify parameters for this new class of vessel. Designs with varied L/BOA-ratios and constant deck area are compared to find configurations of low total resistance for carrying a nominated deadweight at a particular speed, the associated change of the light ship weight has been taken into account. Two different model test series of catamaran models have been considered and their resistance curves agreed to each other. Recommendations are made; with the most important being the vessel should not exceed a speed of Fr = 0.35, with optimal prismatic coefficients around CP ≈ 0.5 and low transom immersion. This study presents the preliminary design of medium-speed single and twin-hull vessels for operations close to hump speed.


Transactions RINA, Vol 154, Part A3, International Journal Maritime Engineering, Jul-Sep 2012 

DOI Number

DOI No: 10.3940/rina.ijme.2012.a3.234

Search and Order IJME papers

All International Journal of Maritime Engineering (IJME) 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

Teinbridge Propeller

Euronaval Apr - Oct 2022

Herbert Engineering

Uni Stratchclyde June 2021

Metstrade May 2022