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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. -
The Eastern Mail (Waterville, Maine) Waterville Materials
Colby College Digital Commons @ Colby The Eastern Mail (Waterville, Maine) Waterville Materials 4-23-1863 The Eastern Mail (Vol. 16, No. 42): April 23, 1863 Ephraim Maxham Daniel Ripley Wing Follow this and additional works at: https://digitalcommons.colby.edu/eastern_mail Part of the Agriculture Commons, American Popular Culture Commons, Journalism Studies Commons, and the United States History Commons Recommended Citation Maxham, Ephraim and Wing, Daniel Ripley, "The Eastern Mail (Vol. 16, No. 42): April 23, 1863" (1863). The Eastern Mail (Waterville, Maine). 821. https://digitalcommons.colby.edu/eastern_mail/821 This Newspaper is brought to you for free and open access by the Waterville Materials at Digital Commons @ Colby. It has been accepted for inclusion in The Eastern Mail (Waterville, Maine) by an authorized administrator of Digital Commons @ Colby. ■T ■■ MISOqLLAJSTY. ara subject, tbs parent may decide whioli iball go lo the war; the only brother of children THS SNAKE IN THE GRASS. nnder twelve, who ate dependent on his labor for support ; (he father of motherless cliildren BT JOSK a. 9AXI. under twelve, who are dependent nn his labor Coma, listen Rvhtta to me, ipy led.- lor supporf; whaTs tberif are d fatiiei'-and two OaOe, lleien to (ke Tor e spell I Let that terrible drum sons in the same family and household, and For n moment be dumb, two af IbMft'kfe iit'fhu mniidry sbi4ifce bf tifd' For jrbur nli'cte Is^oins to tell United States, ae non commieeianed officers, What befell A youth who loved liquor too weir. musicians, or privali^a, Iho reaidyie pr.gu«li faiii- A elevef young mnn was he, my lad, . -
Radio 4 Listings for 2 – 8 May 2020 Page 1 of 14
Radio 4 Listings for 2 – 8 May 2020 Page 1 of 14 SATURDAY 02 MAY 2020 Professor Martin Ashley, Consultant in Restorative Dentistry at panel of culinary experts from their kitchens at home - Tim the University Dental Hospital of Manchester, is on hand to Anderson, Andi Oliver, Jeremy Pang and Dr Zoe Laughlin SAT 00:00 Midnight News (m000hq2x) separate the science fact from the science fiction. answer questions sent in via email and social media. The latest news and weather forecast from BBC Radio 4. Presenter: Greg Foot This week, the panellists discuss the perfect fry-up, including Producer: Beth Eastwood whether or not the tomato has a place on the plate, and SAT 00:30 Intrigue (m0009t2b) recommend uses for tinned tuna (that aren't a pasta bake). Tunnel 29 SAT 06:00 News and Papers (m000htmx) Producer: Hannah Newton 10: The Shoes The latest news headlines. Including the weather and a look at Assistant Producer: Rosie Merotra the papers. “I started dancing with Eveline.” A final twist in the final A Somethin' Else production for BBC Radio 4 chapter. SAT 06:07 Open Country (m000hpdg) Thirty years after the fall of the Berlin Wall, Helena Merriman Closed Country: A Spring Audio-Diary with Brett Westwood SAT 11:00 The Week in Westminster (m000j0kg) tells the extraordinary true story of a man who dug a tunnel into Radio 4's assessment of developments at Westminster the East, right under the feet of border guards, to help friends, It seems hard to believe, when so many of us are coping with family and strangers escape. -
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. -
Trafalgar Day Dr Liz Sidwell Our Eco
This issue: Victory Open Evening | Sixth Form Trip | Council Visit |<U 3UR¿OHV November 2011 Vol 2 No 1 Trafalgar Day Celebrations Galore over 2 days Dr Liz Sidwell Full visit report Our Eco Day We show our true green colours www.ormistonvictoryacademy.co.uk November 2011 Victory Flag: Vol 1 No. 6 Principal Points P3 News in Brief P4 Costessey News/Beauty Blog P5 Celebrating Trafalgar Day P6 - 11 Reach For The Stars P12 - 13 Beauty Transformational A-Levels P14 Eton @ Norfolk P15 School Commissioner Visit P16 - 17 ISSUE Pen to Paper P18 VIP Roll Of Honour P19 Victory Goes Green P20 - 21 @Victory Green Academy Update P22 - 23 VIP Visit - Peter Swift P24 Lights, Camera, Action P25 7KH¿UVWEHDXW\VDORQZLWKLQDQ$FDGHP\ Welcome Year 6s Victory Open Evening P26 from across the county. It was a Victory In The Stars P27 Principal Points brilliant day. State of the art facilities, The Stars @ Victory P27 Sixth Form Sojourn Trip P28 - 29 So much has happened I said from the outset that my goal was Family Memories P30 WRPDNH9LFWRU\$FDGHP\WKHÀDJVKLS latest technologies in the last few months. school of the Eastern Region. By any Sixth Form Makeover P31 measure, we are well on the way to Open Thursday 1pm-4pm and Friday 9.30am – 2.30pm Inside Science P32 Our GCSE results were achieving this. Beauty @ Victory P33 We offer a full range of beauty treatments. Full price list available outstanding with a Above all, everything we do is for County Council Visit P34 Ring for appointments on 01603 742310 ex 3312 our students. -
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. -
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Fitting the Unstayed Mast Rig To
ITTING THE UNSTAYED MAST RIG TO YOUR BOAT SOME POPULAR QUESTIONS ANSWERED: - . Will it suit any boat of any hull shape? - Yes, and will particularly aid shallow draft hulls of low ballast ratio as the flexibility of the mast reduces heeling in all conditions. 2. Can it be fitted to multihulls? - Yes, Trimaran installations are similar to monohulls. Catamarans can either have modified bridge decks to obtain sufficient bury of mast or fit a smaller mast in each hull. 3. Can I use my existing stayed rig mast?- No, with the exception of some solid timber Gaff rig masts. 4. Does the mast have to be keel stepped? - Preferably, but it can be fitted in a deck tabernacle. 5. Where is the mast stepped? - Approximately 2 to 4 feet forward of a stayed mast postion. 6. Does it have to be near a bulkhead? - No, as the load transmitted to the deck is not enormous. 7. What structural modifications will I have to make to my boat? - Probably increase the deck strength at the mast by adding:- - for GRP boats more layup of C.S. matt which will be hidden by the head lining under the deck. - for steel, alloy, ferrocement, timber boats, add a deck beam. The mast step only needs to be firmly secured to the keel and no extra reinforcement is necessary to be the boat's keel. - for sheeting to the pushpit, possibly, add a bracing strut across the existing tube, such as a sheet track. 8. How many sails and of what area should be used? - As a general rule:- For boats up to 30 ft., one sail is more ideal. -
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. -
TAHITI DOUCHE When Development Is No Longer Possible, Change Intervenes, Said Alain Gliksman
44-47 Patrimoine_MM147-US:PATRIMOINE 10/05/11 13:59 Page 44 HERITAGE The last of the big proas: TAHITI DOUCHE When development is no longer possible, change intervenes, said Alain Gliksman. This change gave us the craziest boats in nautical history: the proas. Here is the story of the last of these big boats... By Philippe Echelle In 1979-80, we believed we ROSIERE’s capsize on the start sailing and offshore racing. With was also the only French free- could already evaluate the deve- line of the ’82 Rhum signalled Michel Malinovski, he establi- lance journalist at the start of lopment of multihulls, and the the end of the match, and the shed the profession of journalist- 1960 Transat. The touch at the perspective of twenty years of proas were no longer allowed in tester. From Bateaux magazine helm, honed by heroic RORC western re-discovery led us to transatlantic races. On reflection, to editor in chief of Neptune, this races, and Olympic selections in believe that the next victory it is quite probable that all of gifted, meticulous dandy embo- the Flying Dutchman class, an would reward an inevitably revo- these boats lacked, not inge- died the position of the man of incisive pen and eye, a sharp lutionary machine. The proa nuity, but preparation and perfec- the sea. Flirting with being unfo- tooth; Alain was as comfortable concept was ready and waiting ting. The saga of the biggest sur- cussed, the romantic adventurer in editorial meetings or celebrity in the wings, and we witnessed vivor illustrates this era of pio- a creative proliferation. -
Radio 4 Listings for 21 – 27 August 2021 Page 1 of 16 SATURDAY 21 AUGUST 2021 SAT 06:07 Open Country (M000ytzz) Jay Rayner Hosts the Culinary Panel Show
Radio 4 Listings for 21 – 27 August 2021 Page 1 of 16 SATURDAY 21 AUGUST 2021 SAT 06:07 Open Country (m000ytzz) Jay Rayner hosts the culinary panel show. Sophie Wright, Tim A Fabric Landscape Anderson, Asma Khan and Dr Annie Gray share delectable SAT 00:00 Midnight News (m000yvbc) ideas and answer questions from the audience. The latest news and weather forecast from BBC Radio 4. Fashion designer and judge of The Great British Sewing Bee, Patrick Grant, has a dream: he wants to create a line of jeans This week, the panellists tell us their favourite recipes for that made in Blackburn. It sounds simple, but Patrick wants to go classic savoury nibble, the cheese straw. They also delve into SAT 00:30 Hello, Stranger by Will Buckingham (m000yvbf) the whole hog - growing the crop to make the fabric in the world of fresh peas and, when it comes to cooking with this Episode 5 Blackburn, growing the woad to dye it blue in Blackburn and small green vegetable, our panellists are not quite peas in a pod! finally processing the flax into linen and sewing it all When Will Buckingham's partner died, he coped with his grief together...in Blackburn. Nigerian food writer Yemisi Aribisala explains the significance by throwing his doors open to new people, and travelling alone of soup in Nigerian cuisine, and tells us what goes into the to far-flung places among strangers. 'Strangers are unentangled In this programme, the writer and broadcaster Ian Marchant perfect jollof rice. in our worlds and lives,' he writes, 'and this lack can lighten our travels to a tiny field of flax on the side of the Leeds and own burdens.' Starting from that experience of personal grief, Liverpool Canal, where Patrick and a group of passionate local Producer: Hannah Newton he draws on his knowledge as a philosopher and anthropologist, people are trying to make this dream a reality, and bring the Assistant Producer: Aniya Das as well as a keen and wide-roaming traveller, to explore the textile industry back to Blackburn. -
Radio 4 Listings for 29 February – 6 March 2020 Page 1 of 14
Radio 4 Listings for 29 February – 6 March 2020 Page 1 of 14 SATURDAY 29 FEBRUARY 2020 Series 41 SAT 10:30 The Patch (m000fwj9) Torry, Aberdeen SAT 00:00 Midnight News (m000fq5n) The Wilberforce Way with Inderjit Bhogal National and international news from BBC Radio 4 The random postcode takes us to an extraordinary pet shop Clare Balding walks with Sikh-turned-Methodist, Inderjit where something terrible has been happening to customers. Bhogal, along part of the Wilberforce Way in East Yorkshire. SAT 00:30 The Crying Book, by Heather Christle Inderjit created this long distance walking route to honour Torry is a deprived area of Aberdeen, known for addiction (m000fq5q) Wilberforce who led the campaign against the slave trade. They issues. It's also full of dog owners. In the local pet shop we Episode 5 start at Pocklington School, where Wilberforce studied, and discover Anna who says that a number of her customers have ramble canal-side to Melbourne Ings. Inderjit Bhogal has an died recently from a fake prescription drug. We wait for her Shedding tears is a universal human experience, but why and extraordinary personal story: Born in Kenya he and his family most regular customer, Stuart, to help us get to the bottom of it how do we cry? fled, via Tanzania, to Dudley in the West Midlands in the early - but where is he? 1960s. He couldn’t find anywhere to practice his Sikh faith so American poet Heather Christle has lost a dear friend to suicide started attending his local Methodist chapel where he became Producer/presenter: Polly Weston and must now reckon with her own depression.