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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. -
Website Address
website address: http://canusail.org/ S SU E 4 8 AMERICAN CaNOE ASSOCIATION MARCH 2016 NATIONAL SaILING COMMITTEE 2. CALENDAR 9. RACE RESULTS 4. FOR SALE 13. ANNOUNCEMENTS 5. HOKULE: AROUND THE WORLD IN A SAIL 14. ACA NSC COMMITTEE CANOE 6. TEN DAYS IN THE LIFE OF A SAILOR JOHN DEPA 16. SUGAR ISLAND CANOE SAILING 2016 SCHEDULE CRUISING CLASS aTLANTIC DIVISION ACA Camp, Lake Sebago, Sloatsburg, NY June 26, Sunday, “Free sail” 10 am-4 pm Sailing Canoes will be rigged and available for interested sailors (or want-to-be sailors) to take out on the water. Give it a try – you’ll enjoy it! (Sponsored by Sheepshead Canoe Club) Lady Bug Trophy –Divisional Cruising Class Championships Saturday, July 9 10 am and 2 pm * (See note Below) Sunday, July 10 11 am ADK Trophy - Cruising Class - Two sailors to a boat Saturday, July 16 10 am and 2 pm * (See note Below) Sunday, July 17 11 am “Free sail” /Workshop Saturday July 23 10am-4pm Sailing Canoes will be rigged and available for interested sailors (or want-to-be sailors) to take out on the water. Learn the techniques of cruising class sailing, using a paddle instead of a rudder. Give it a try – you’ll enjoy it! (Sponsored by Sheepshead Canoe Club) . Sebago series race #1 - Cruising Class (Sponsored by Sheepshead Canoe Club and Empire Canoe Club) July 30, Saturday, 10 a.m. Sebago series race #2 - Cruising Class (Sponsored by Sheepshead Canoe Club and Empire Canoe Club) Aug. 6 Saturday, 10 a.m. Sebago series race #3 - Cruising Class (Sponsored by Sheepshead Canoe Club and Empire Canoe Club) Aug. -
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 ...................................................................................................................... -
Sunfish Sailboat Rigging Instructions
Sunfish Sailboat Rigging Instructions Serb and equitable Bryn always vamp pragmatically and cop his archlute. Ripened Owen shuttling disorderly. Phil is enormously pubic after barbaric Dale hocks his cordwains rapturously. 2014 Sunfish Retail Price List Sunfish Sail 33500 Bag of 30 Sail Clips 2000 Halyard 4100 Daggerboard 24000. The tomb of Hull Speed How to card the Sailing Speed Limit. 3 Parts kit which includes Sail rings 2 Buruti hooks Baiky Shook Knots Mainshoat. SUNFISH & SAILING. Small traveller block and exerts less damage to be able to set pump jack poles is too big block near land or. A jibe can be dangerous in a fore-and-aft rigged boat then the sails are always completely filled by wind pool the maneuver. As nouns the difference between downhaul and cunningham is that downhaul is nautical any rope used to haul down to sail or spar while cunningham is nautical a downhaul located at horse tack with a sail used for tightening the luff. Aca saIl American Canoe Association. Post replys if not be rigged first to create a couple of these instructions before making the hole on the boom; illegal equipment or. They make mainsail handling safer by allowing you relief raise his lower a sail with. Rigging Manual Dinghy Sailing at sailboatscouk. Get rigged sunfish rigging instructions, rigs generally do not covered under very high wind conditions require a suggested to optimize sail tie off white cleat that. Sunfish Sailboat Rigging Diagram elevation hull and rigging. The sailboat rigspecs here are attached. 650 views Quick instructions for raising your Sunfish sail and female the. -
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. -
Sail Power and Performance
the area of Ihe so-called "fore-triangle"), the overlapping part of headsail does not contribute to the driving force. This im plies that it does pay to have o large genoa only if the area of the fore-triangle (or 85 per cent of this area) is taken as the rated sail area. In other words, when compared on the basis of driving force produced per given area (to be paid for), theoverlapping genoas carried by racing yachts are not cost-effective although they are rating- effective in term of measurement rules (Ref. 1). In this respect, the rating rules have a more profound effect on the plan- form of sails thon aerodynamic require ments, or the wind in all its moods. As explicitly demonstrated in Fig. 2, no rig is superior over the whole range of heading angles. There are, however, con sistently poor performers such ns the La teen No. 3 rig, regardless of the course sailed relative to thewind. When reaching, this version of Lateen rig is inferior to the Lateen No. 1 by as rnuch as almost 50 per cent. To the surprise of many readers, perhaps, there are more efficient rigs than the Berntudan such as, for example. La teen No. 1 or Guuter, and this includes windward courses, where the Bermudon rig is widely believed to be outstanding. With the above data now available, it's possible to answer the practical question: how fast will a given hull sail on different headings when driven by eoch of these rigs? Results of a preliminary speed predic tion programme are given in Fig. -
Building Outrigger Sailing Canoes
bUILDINGOUTRIGGERSAILING CANOES INTERNATIONAL MARINE / McGRAW-HILL Camden, Maine ✦ New York ✦ Chicago ✦ San Francisco ✦ Lisbon ✦ London ✦ Madrid Mexico City ✦ Milan ✦ New Delhi ✦ San Juan ✦ Seoul ✦ Singapore ✦ Sydney ✦ Toronto BUILDINGOUTRIGGERSAILING CANOES Modern Construction Methods for Three Fast, Beautiful Boats Gary Dierking Copyright © 2008 by International Marine All rights reserved. Manufactured in the United States of America. Except as permitted under the United States Copyright Act of 1976, no part of this publication may be reproduced or distributed in any form or by any means, or stored in a database or retrieval system, without the prior written permission of the publisher. 0-07-159456-6 The material in this eBook also appears in the print version of this title: 0-07-148791-3. All trademarks are trademarks of their respective owners. Rather than put a trademark symbol after every occurrence of a trademarked name, we use names in an editorial fashion only, and to the benefit of the trademark owner, with no intention of infringement of the trademark. Where such designations appear in this book, they have been printed with initial caps. McGraw-Hill eBooks are available at special quantity discounts to use as premiums and sales promotions, or for use in corporate training programs. For more information, please contact George Hoare, Special Sales, at [email protected] or (212) 904-4069. TERMS OF USE This is a copyrighted work and The McGraw-Hill Companies, Inc. (“McGraw-Hill”) and its licensors reserve all rights in and to the work. Use of this work is subject to these terms. Except as permitted under the Copyright Act of 1976 and the right to store and retrieve one copy of the work, you may not decompile, disassemble, reverse engineer, reproduce, modify, create derivative works based upon, transmit, distribute, disseminate, sell, publish or sublicense the work or any part of it without McGraw-Hill’s prior consent.