Page 168 - Practical Design Ships and Floating Structures

Practical Design of Ships and Other Floating Smctures 143
You-Sheng Wu, Wei-Cheng Cui and Guo-Jun Zhou (Eds)
0 2001 Elsevier Science Ltd. All rights reserved

TRIMARAN MODEL TEST RESULTS AND COMPARISON WITH
DIFFERENT HIGH SPEED CRAFT

C. Bertorello', D. Bruzzone ', P. Cassella' and I. Zotti'

'Universita di Napoli Federico 11, Dipartimento di lngegneria Navale
via Claudio, 2 1 - 80 125 Napoli Italy
'UniversitA di Genova, Dipartimento di Ingegneria Navale e Tecnologie Marine
via Montallegro, 1 - 16 145 Genova Italy
'Universita di Trieste, Dipartimento di Ingegneria Navale, del Mare e per 1'Ambiente
via A. Valerio, 10 - 34 127 Trieste Italy

ABSTRACT

This paper summarises the results of a research program on high speed trimarans, jointly performed at
Genoa, Naples and Trieste Universities. Two geosim models of a trimaran hull (scale ratio h = 10 and
)c = 20) equivalent to high speed vessels operating in the bay of Naples have been built. Resistance
tests were carried out in order to assess the best trim and configuration as regard the hydrodynamic
resistance. Wave pattern experimental research was also carried out for the main hull, for the outrigger
and for the best obtained trimaran configuration. Besides, seakeeping tests have been executed in head
regular waves on the main hull and on the trimaran configuration. Some of the obtained experimental
results have been analysed and compared with corresponding data relating to catamaran and monohull
with equivalent service capabilities.

KEYWORDS

Trimaran model tests, Resistance, Seakeeping, HSC comparison.

1 INTRODUCTION
Various hull forms have been proposed in recent years to satisfy the world trend for high speed
maritime transportation, especially in the field of passengerhehicle ferries. The demand for fast sea
transportation has led to a significant growth of interest in multi-hulled ships. An interesting possibility
seems to be the trimaran, for a more convenient accommodation layout and for the increased stability
also under damaged conditions. Besides, a trimaran configuration with the optimum position of the
side hulls can produce a beneficial wave interference at a given speed and could also offer powering
benefits when compared to conventional monohull and catamarans.