Multihull Pioneer James Wharram Is Still Preaching the Gospel
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On the Great Trimaran-Catamaran Debate
On the Great Trimaran-Catamaran Debate Lawrence J. Doctors, Member, School of MechanicnJ and Manufacturing Engineering, The University of New South Wales, Sydney, NSW 2052, Australia Abdmct In the cumwtt work, a aydewaatic investigation into a variety of monohulls and mul- tihulls is carried out with an emphasis on finding optimal forms. Vessels with up to six identical subhulls are taken into consideration and a large range of lengths is studied. hT- thermore, sidehuli trimaran configurations are included in the investigation. There are two main purposes to this investigation. Firstly, one is interested in mini- mizing the wave resistance, becawe this is closely related to the wave generation and is of critical importance to the operation of river ferries. Secondly, it is also important to min- imize the total resistance, in order to reduce fuei costs and to permit long-range trips for ocean-going vessels. The theoretical predictions show that increasing the length beyond that normally accepted is beneficial in reducing both the wave Resistance and often the total resistance. I. the goal is to minimize wave resistance and if the length is constrained, the calculations also demon- strate that trimarans are superior to catamarans, which are in turn superior to monohulls. On the other hand, if the goal is to minimize the total resistance, then all the muh!ihulis (~m catamarans to hezamarans) are inferior to monohulls, except possibly at low speeds which are not of interest in thw study. Similarly, sidehull trimarans are shown to be inferior to catamarans except perhaps if rather great lengths are permitted. -
Trimarans and Outriggers
TRIMARANS AND OUTRIGGERS Arthur Fiver's 12' fibreglass Trimaran with solid plastic foam floats CONTENTS 1. Catamarans and Trimarans 5. A Hull Design 2. The ROCKET Trimaran. 6. Micronesian Canoes. 3. JEHU, 1957 7. A Polynesian Canoe. 4. Trimaran design. 8. Letters. PRICE 75 cents PRICE 5 / - Amateur Yacht Research Society BCM AYRS London WCIN 3XX UK www.ayrs.org office(S)ayrs .org Contact details 2012 The Amateur Yacht Research Society {Founded June, 1955) PRESIDENTS BRITISH : AMERICAN : Lord Brabazon of Tara, Walter Bloemhard. G.B.E., M.C, P.C. VICE-PRESIDENTS BRITISH : AMERICAN : Dr. C. N. Davies, D.sc. John L. Kerby. Austin Farrar, M.I.N.A. E. J. Manners. COMMITTEE BRITISH : Owen Dumpleton, Mrs. Ruth Evans, Ken Pearce, Roland Proul. SECRETARY-TREASURERS BRITISH : AMERICAN : Tom Herbert, Robert Harris, 25, Oakwood Gardens, 9, Floyd Place, Seven Kings, Great Neck, Essex. L.I., N.Y. NEW ZEALAND : Charles Satterthwaite, M.O.W., Hydro-Design, Museum Street, Wellington. EDITORS BRITISH : AMERICAN : John Morwood, Walter Bloemhard "Woodacres," 8, Hick's Lane, Hythe, Kent. Great Neck, L.I. PUBLISHER John Morwood, "Woodacres," Hythc, Kent. 3 > EDITORIAL December, 1957. This publication is called TRIMARANS as a tribute to Victor Tchetchet, the Commodore of the International MultihuU Boat Racing Association who really was the person to introduce this kind of craft to Western peoples. The subtitle OUTRIGGERS is to include the ddlightful little Micronesian canoe made by A. E. Bierberg in Denmark and a modern Polynesian canoe from Rarotonga which is included so that the type will not be forgotten. The main article is written by Walter Bloemhard, the President of the American A.Y.R.S. -
5 Must Read Sailing Books for Catamaran Enthusiasts
5 Must Read Sailing Books for Catamaran Enthusiasts This list briefly discusses 5 books that yacht owners or enthusiasts should read. What makes each book unique? Why should they read the book? What will they learn or take away from it? This is - at least what we consider - the best 5 books ever written in English on the subject of cruising catamarans. There are a few German and French publications but they are nearly impossible to get , most are out of print and unless you can read German or French - are of no value. So here is the top 5 list of the "Must Read books for Catamaran Enthusiasts" 1.) CATAMARANS - THE COMPLETE GUIDE FOR CRUISING SAILORS, by Gregor Tarjan. First published in 2006 and reprinted in 2008 by Mc Graw Hill Companies, New York. ISBN 9780071498852. Hardcover, 305 pages full color, large format, illustrated and lavish photography by Gilles Martin Raget. Of course we have to mention this book first. Not only is it written by our own Gregor Tarjan, founder and owner of Aeroyacht Ltd., but it is hailed as "the industry reference" by many experts. It has sold many thousands of copies around the world and has been re-printed numerous times. Jim Brown calls it "an authoritative guide for novices and experienced sailors, the best book written on the subject since the early 1990's" 2.) MULTIHULL SEAMANSHIP - Illustrated, by Dr. Gavin LeSueur. Illustrations by Nigel Allison. First published in Australia in 1995, Cyclone Publishers. ISBN 1875181032. Soft cover, spiral bound, large format, 108 pages, black and white. -
CAT CRAZY, TRI FI and Other Multihull Comparisons by Jim Brown
CAT CRAZY, TRI FI And Other Multihull Comparisons By Jim Brown “There is nothing, absolutely nothing, quite so much worth doing as simply messing about in…” Multihulls! That paraphrased quote is pilfered for the most part from Ratty, the revered rodent in Kenneth Grahame’s venerated tale “The Wind in the Willows.” Of course, Grahame and Ratty said it of ordinary boats, and neither would have, even could have, said it of multihulls. But if Brown had been the author instead of Grahame, his character Ratty might have said something like, “There is nothing, absolutely nothing quite so creative as screwing around with multihulls.” By “screwing around,” Ratty would have spoken literally, meaning to conceive, gestate, whelp, wean and release upon the Earth’s fluid interface one’s very own flesh and blood multihulls. And that’, impatient reader, is what this appendix is about, so like most appendices reading it is strictly optional. In that you are reading on, please be prepared for some sacrilege. Suggesting there is something divine about boat design and construction I will try to trace multihull origins by expanding on the theorem expressed by my late friend Walt Glaser who said (in Chapter 1 of my memoir, “Among the Multihulls,”), “A man builds a boat to make up for the fact that he can’t build a baby… What else can a guy produce with his own body that so closely simulates a living thing?” It took me many years of both messing about in and screwing around with boats to apprehend this aspect of watercraft, and I admit that it still takes quite a stretch for me to accept the notion. -
ORC Special Regulations Mo3 with Life Raft
ISAF OFFSHORE SPECIAL REGULATIONS Including US Sailing Prescriptions www.ussailing.org Extract for Race Category 4 Multihulls JANUARY 2014 - DECEMBER 2015 © ORC Ltd. 2002, all amendments from 2003 © International Sailing Federation, (IOM) Ltd. Version 1-3 2014 Because this is an extract not all paragraph numbers will be present RED TYPE/SIDE BAR indicates a significant change in 2014 US Sailing extract files are available for individual categories and boat types (monohulls and multihulls) at: http://www.ussailing.org/racing/offshore-big-boats/big-boat-safety-at-sea/special- regulations/extracts US Sailing prescriptions are printed in bold, italic letters Guidance notes and recommendations are in italics The use of the masculine gender shall be taken to mean either gender SECTION 1 - FUNDAMENTAL AND DEFINITIONS 1.01 Purpose and Use 1.01.1 It is the purpose of these Special Regulations to establish uniform ** minimum equipment, accommodation and training standards for monohull and multihull yachts racing offshore. A Proa is excluded from these regulations. 1.01.2 These Special Regulations do not replace, but rather supplement, the ** requirements of governmental authority, the Racing Rules and the rules of Class Associations and Rating Systems. The attention of persons in charge is called to restrictions in the Rules on the location and movement of equipment. 1.01.3 These Special Regulations, adopted internationally, are strongly ** recommended for use by all organizers of offshore races. Race Committees may select the category deemed most suitable for the type of race to be sailed. 1.02 Responsibility of Person in Charge 1.02.1 The safety of a yacht and her crew is the sole and inescapable ** responsibility of the person in charge who must do his best to ensure that the yacht is fully found, thoroughly seaworthy and manned by an experienced crew who have undergone appropriate training and are physically fit to face bad weather. -
A Comparative Evaluation of a Hydrofoil-Assisted Trimaran
COMPARATIVE EVALUATION OF A A HYDROFOIL-ASSISTED TRIMARAN Thesis presented in partial fulfillment of the requirements for the degree MASTER OF SCIENCE IN ENGINEERING By Ryno Moolman Supervisor Prof. T.M. Harms Department of Mechanical Engineering University of Stellenbosch Co-supervisor Dr. G. Migeotte CAE Marine December 2005 Declaration I, the undersigned, declare that the work contained in this thesis is my own original work and has not previously, in its entirety or in part, been submitted at any University for a degree. Signature of Candidate Date i Abstract This work is concerned with the design and hydrodynamic aspects of a hydrofoil-assisted trimaran. A design and configuration of a trimaran is evaluated and the performance of a hydrofoil-assisted trimaran is effectively compared to the performance of a hydrofoil-assisted catamaran with similar overall displacement and same speed. The performance of the trimaran with different outrigger clearances are also evaluated and compared. The hydrodynamic aspects focuses mainly on the performance and to a lesser extend on the sea-keeping and stability of a hydrofoil-assisted trimaran. The results were determined by means of experimental testing, theoretical analysis and numerical analysis. The project was initiated as a result of the success of the hydrofoil-assisted catamarans and due to the fact that there does not exist a hydrofoil-assisted trimaran (to the author’s knowledge) where the main focus of the foils is to significantly reduce the resistance. A brief history, recent developments and associated advantages regarding trimarans are discussed. A complete theoretical model is presented to evaluate the lift and drag of the hydrofoils, as well as, the resistance of the trimaran. -
The Practical Design of Advanced Marine Vehicles
The Practical Design of Advanced Marine Vehicles By: Chris B. McKesson, PE School of Naval Architecture and Marine Engineering College of Engineering University of New Orleans 2009 Version: Fall 2009 rev 0 This work sponsored by: US Office of Naval Research Grant No: N00014‐09‐1‐0145 1 2 CONTENTS 1 Summary & Purpose of this Textbook ................................................................................................ 27 1.1 Relationship of the Course to Program Outcomes ..................................................................... 28 1.2 Prerequisites ............................................................................................................................... 28 1.3 Resources .................................................................................................................................... 28 1.3.1 Numbered references cited in the text ................................................................................. 29 1.3.2 Important references not explicitly cited in the text ............................................................ 31 1.3.3 AMV Web Resources ............................................................................................................. 32 1.3.4 AMV Design Agents ............................................................................................................... 32 1.3.5 AMV Builders ......................................................................................................................... 33 2 A Note on Conventions ...................................................................................................................... -
The Canoe Is the People LEARNER's TEXT
The Canoe Is The People LEARNER’S TEXT United Nations Local and Indigenous Educational, Scientific and Knowledge Systems Cultural Organization Learnerstxtfinal_C5.indd 1 14/11/2013 11:28 The Canoe Is the People educational Resource Pack: Learner’s Text The Resource Pack also includes: Teacher’s Manual, CD–ROM and Poster. Produced by the Local and Indigenous Knowledge Systems (LINKS) Programme, UNESCO www.unesco.org/links Published in 2013 by the United Nations Educational, Scientific and Cultural Organization 7, place de Fontenoy, 75352 Paris 07 SP, France ©2013 UNESCO All rights reserved The designations employed and the presentation of material throughout this publication do not imply the expression of any opinion whatsoever on the part of UNESCO concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries. The ideas and opinions expressed in this publication are those of the authors; they are not necessarily those of UNESCO and do not commit the Organization. Coordinated by Douglas Nakashima, Head, LINKS Programme, UNESCO Author Gillian O’Connell Printed by UNESCO Printed in France Contact: Douglas Nakashima LINKS Programme UNESCO [email protected] 2 The Canoe Is the People: Indigenous Navigation in the Pacific Learnerstxtfinal_C5.indd 2 14/11/2013 11:28 contents learner’s SECTIONTEXT 3 The Canoe Is the People: Indigenous Navigation in the Pacific Learnerstxtfinal_C5.indd 3 14/11/2013 11:28 Acknowledgements The Canoe Is the People Resource Pack has benefited from the collaborative efforts of a large number of people and institutions who have each contributed to shaping the final product. -
James Wharram and Hanneke Boon
68 James Wharram and Hanneke Boon 11 The Pacific migrations by Canoe Form Craft James Wharram and Hanneke Boon The Pacific Migrations the canoe form, which the Polynesians developed into It is now generally agreed that the Pacific Ocean islands superb ocean-voyaging craft began to be populated from a time well before the end of The Pacific double ended canoe is thought to have the last Ice Age by people, using small ocean-going craft, developed out of two ancient watercraft, the canoe and originating in the area now called Indonesia and the the raft, these combined produce a craft that has the Philippines It is speculated that the craft they used were minimum drag of a canoe hull and maximum stability of based on either a raft or canoe form, or a combination of a raft (Fig 111) the two The homo-sapiens settlement of Australia and As the prevailing winds and currents in the Pacific New Guinea shows that people must have been using come from the east these migratory voyages were made water craft in this area as early as 6040,000 years ago against the prevailing winds and currents More logical The larger Melanesian islands were settled around 30,000 than one would at first think, as it means one can always years ago (Emory 1974; Finney 1979; Irwin 1992) sail home easily when no land is found, but it does require The final long distance migratory voyages into the craft capable of sailing to windward Central Pacific, which covers half the worlds surface, began from Samoa/Tonga about 3,000 years ago by the The Migration dilemma migratory group -
Pacific Colonisation and Canoe Performance: Experiments in the Science of Sailing
PACIFIC COLONISATION AND CANOE PERFORMANCE: EXPERIMENTS IN THE SCIENCE OF SAILING GEOFFREY IRWIN University of Auckland RICHARD G.J. FLAY University of Auckland The voyaging canoe was the primary artefact of Oceanic colonisation, but scarcity of direct evidence has led to uncertainty and debate about canoe sailing performance. In this paper we employ methods of aerodynamic and hydrodynamic analysis of sailing routinely used in naval architecture and yacht design, but rarely applied to questions of prehistory—so far. We discuss the history of Pacific sails and compare the performance of three different kinds of canoe hull representing simple and more developed forms, and we consider the implications for colonisation and later inter-island contact in Remote Oceania. Recent reviews of Lapita chronology suggest the initial settlement of Remote Oceania was not much before 1000 BC (Sheppard et al. 2015), and Tonga was reached not much more than a century later (Burley et al. 2012). After the long pause in West Polynesia the vast area of East Polynesia was settled between AD 900 and AD 1300 (Allen 2014, Dye 2015, Jacomb et al. 2014, Wilmshurst et al. 2011). Clearly canoes were able to transport founder populations to widely-scattered islands. In the case of New Zealand, modern Mäori trace their origins to several named canoes, genetic evidence indicates the founding population was substantial (Penney et al. 2002), and ancient DNA shows diversity of ancestral Mäori origins (Knapp et al. 2012). Debates about Pacific voyaging are perennial. Fifty years ago Andrew Sharp (1957, 1963) was sceptical about the ability of traditional navigators to find their way at sea and, more especially, to find their way back over long distances with sailing directions for others to follow. -
Teori Dan Panduan Praktis
TEORI DAN PANDUAN PRAKTIS HIDRODINAMIKA KAPAL HUKUM ARCHIMEDES Penulis Bagiyo Suwasono Ali Munazid Rodlitul Awwalin G.A.P. Poundra Sutiyo i Hang Tuah University Press ii TEORI DAN PANDUAN PRAKTIS HIDRODINAMIKA KAPAL HUKUM ARCHIMEDES iii Sanksi Pelanggaran Pasal 113 Undang-Undang No. 28 Tahun 2014 Tentang Hak Cipta 1. Setiap Orang yang dengan tanpa hak melakukan pelanggaran hak ekonomi sebagaimana dimaksud dalam Pasal 9 ayat (1) huruf i untuk Penggunaan Secara Komersial dipidana dengan pidana penjara paling lama 1 (satu) tahun dan/atau pidana denda paling banyak Rp. 100.000.000,- (Seratus juta rupiah). 2. Setiap Orang yang dengan tanpa hak dan/atau tanpa izin Pencipta atau pemegang Hak Cipta melakukan pelanggaran hak ekonomi Pencipta sebagaimana dimaksud dalam Pasal 9 ayat (1) huruf c, huruf d, huruf f, dan/atau huruf h untuk Penggunaan Secara Komersial dipidana dengan pidana penjara paling lama 3 (tiga) tahun dan/atau pidana denda paling banyak Rp. 500.000.000,- (lima ratus juta rupiah). 3. Setiap Orang yang dengan tanpa hak dan/atau tanpa izin Pencipta atau pemegang Hak Cipta melakukan pelanggaran hak ekonomi Pencipta sebagaimana dimaksud dalam Pasal 9 ayat (1) huruf a, huruf b, huruf e, dan/atau huruf g untuk Penggunaan Secara Komersial dipidana dengan pidana penjara paling lama 4 (empat) tahun dan/atau pidana denda paling banyak Rp. 1.000.000.000,- (satu miliar rupiah). 4. Setiap Orang yang memenuhi unsur sebagaimana dimaksud pada ayat (3) yang dilakukan dalam bentuk pembajakan, dipidana dengan pidana penjara paling lama 10 (sepuluh) tahun dan/atau pidana denda paling banyak Rp. 4.000.000.000,- (empat miliar rupiah) iv TEORI DAN PANDUAN PRAKTIS HIDRODINAMIKA KAPAL HUKUM ARCHIMEDES Oleh: Bagiyo Suwasono Ali Munazid Rodlitul Awwalin G.A.P. -
TRINIDAD & TOBAGO FAR MORE THAN a HURRICANE HOLE See Stories on Page 21 & 24 CHRIS DOYLE (2) NOVEMBER 2012 CARIBBEAN COMPASS PAGE 2 Conventional Controllers
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