Glass Slipper Wins Trans-Pac Catamaran Race
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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. -
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 ...................................................................................................................... -
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 -
Pre-Modern Sri Lankan Ships and Shipping
1 [ E:RESEARCH] 2002 SHIPS AND THE DEVELOPMENT OF MARITIME TECHNOLOGY IN THE INDIAN OCEAN. Parkin,D. and Barnes,R. (eds.) RoutledgeCurzon, London, 2002. ISBN 0-7007-1235-6 (Papers read at the second conference in the series The Indian Ocean: Transregional creation of societies and cultures organized by the Institute of Social and Cultural Anthropology, University of Oxford, and held at St.Anthony’s College, in May 1998) Chapter 5 PRE - MODERN SRI LANKAN SHIPS Somasiri Devendra Introduction There are many references to Sri Lankan ships in the historical records of Sri Lanka, as well as other countries. Yet, we have little idea of the appearance or structural characteristics of the early vessels. This paper, which tries to find an answer to these questions, is presented in two parts. Part 1 states the hypothesis and the path followed to test it. Part 2 describes the traditional ships that survived into this century. The inland watercraft, which are important 2 for a fuller appreciation of this subject, is not dealt with here as I have dealt with them at length elsewhere. (Devendra 1995: 211-238) PART I Hypothesis All Sri Lankan ships and watercraft developed from two basic forms that evolved out of the interaction between the inshore maritime environment and the biological resources of the island. Shared cultural links with, and technological forms prevalent in, south India were the other parameters. When Sri Lankan vessels eventually ventured farther out into the ocean, these basic forms underwent further and greater modification to fit the new environment. Contacts with foreign ships calling at Sri Lanka and experiences gained by sailing in foreign waters, exposed Sri Lankan mariners to types of craft and technologies that had originated in different parts of the Indian Ocean (and beyond). -
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. -
I DESAIN FLAT TOP BARGE 300 Feet MENGGUNAKAN PORTABLE
SKRIPSI – ME 141501 DESAIN FLAT TOP BARGE 300 feet MENGGUNAKAN PORTABLE DYNAMIC POSITIONING SYSTEM Izzu Alfaris Murtadha NRP 4211 100 060 Dosen Pembimbing Ir.Agoes Santoso,M.Sc.,M.Phil. Juniarko Pranada, ST., MT. DEPARTEMEN TEKNIK SISTEM PERKAPALAN Fakultas Teknologi Kelautan Institut Teknologi Sepuluh Nopember Surabaya 2017 i “Halaman Ini Sengaja Dikosongkan” ii FINAL PROJECT – ME 141501 FLAT TOP BARGE 300 feet DESIGN USING PORTABLE DYNAMIC POSITIONING SYSTEM Izzu Alfaris Murtadha NRP 4211 100 060 Advisor Ir.Agoes Santoso,M.Sc.,M.Phil. Juniarko Pranada, ST., MT. DEPARTMENT OF MARINE ENGINEERING Faculty of Marine Technology Institut Teknologi Sepuluh Nopember Surabaya 2017 iii “Halaman Ini Sengaja Dikosongkan” iv LEMBAR PENGESAHAN DESAIN FLAT TOP BARGE 300 feet MENGGUNAKAN PORTABLE DYNAMIC POSITIONING SYSTEM TUGAS AKHIR Diajukan Untuk Memenuhi Salah Satu Syarat Memperoleh Gelar Sarjana Teknik pada Bidang Studi Marine Machinery and Desain (MMD) Program Studi S-1 Departemen Teknik Sistem Perkapalan Fakultas Teknologi Kelautan Institut Teknologi Sepuluh Nopember Oleh: Izzu Alfaris Murtadha NRP 4211 100 060 Disetujui oleh Pembimbing Tugas Akhir: 1. Ir.Agoes Santoso,M.Sc,M.Phil ( ) 2. Juniarko Prananda, ST.MT ( ) SURABAYA Januari 2017 i “Halaman Ini Sengaja Dikosongkan” ii LEMBAR PENGESAHAN DESAIN FLAT TOP BARGE 300 feet MENGGUNAKAN PORTABLE DYNAMIC POSITIONING SYSTEM TUGAS AKHIR Diajukan Untuk Memenuhi Salah Satu Syarat Memperoleh Gelar Sarjana Teknik pada Bidang Studi Marine Machinery and Desain (MMD) Program Studi S-1 Departemen Teknik Sistem Perkapalan Fakultas Teknologi Kelautan Institut Teknologi Sepuluh Nopember Oleh: Izzu Alfaris Murtadha NRP 4211 100 060 Disetujui oleh Kepala Departemen Teknik SistemPerkapalan Dr.Eng.Muhammad Badruz Zaman,S.T.,M.T. -
Traditional Fishing Crafts of India
Traditional fishing crafts of India Fishing boats of Gujarat There is marked difference in the geographical and physical features of northern and southern regions of Gujarat. Whereas the northern region is arid and stony, the southern region is distinguished by sandy bottom. The following types of boat with their broad features gives along side are found in Gujarat. 1) Haler machwa: Length varies from 8-10 m Broad beam and square stern Open boat except for short decking in the fore and aft. Carvel planking with unusually large and heavy frames Tall mast carries on large lateen sail of Arab pattern It is used for gillnet fishing. 2) Porbandar machwa Length varies from 6-8 m Square stern and raked stem Used for gill net fishing 3) Cambay machwa Raked stem Undecked except for short length at stern Truncated stern with a slight rake 1 4) Navalaki hodi Length 5-6 m, breadth 1-1.5 m and draft of 90-105 cm Square stern and overhang bow Decked only fore and aft Single mast carries lateen soil 5) Malia boat Flat bottom boat which measure about 6-7 m in length, breadth 1.5 m with 65cm draft. Ends are pointed and there is small rudder Carvel planking Mast carries a lateen sail Small decking fore and aft Used in tidal waters for prawn fishery 6) Dugout canoe Double – ended round bottom boat Length varies from 5-9 m, breadth 60-90 cm and depth 60-68 cm Small sail raised on a wooden mast Used for gill netting 2 7) Ludhia The boat measures 9-10 m in length and 1.5 to 2 m breadth Short decking at the fore and aft Slightly racked stem and stern Two masts with small lateen sails Carved planking and has strong keel and heavy frames 8) Madhwad type wahan Length 10-13 m and breadth 2-3 m Raked stem and square stern Decked at the fore and aft Large heavy rudder Mast with lateen soil Used for operation of gill nets and dol nets Fishing boats of Maharashtra The physical and geographical features of northern Maharashtra up to Mumbai are similar to those of southern Gujarat. -
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.