hull design

Discussion in 'Boat Design' started by shoaib_jaff, Apr 29, 2006.

  1. Guillermo
    Joined: Mar 2005
    Posts: 3,644
    Likes: 188, Points: 63, Legacy Rep: 2247
    Location: Pontevedra, Spain

    Guillermo Ingeniero Naval

    1 day voyage for a 50m stern trawler and a 3800 m trawling depth sound quite weird to me. I do not know if there is net handling machinery for such an extreme depth. What's the intended base port and fishery? As you probably know, a moratory on deep sea bottom trawling is being internationally considered, due to its pernicious effect on some habitats (http://news.bbc.co.uk/1/hi/sci/tech/4308156.stm)
    Please, do not post information little by little about your design determining factors, or I'll not be happy about helping (And probably others either). Just post all you already know or want to know about. That's more fair.
    Cheers.

    P.S.
    “In recent years in India, the major thrust in fisheries development has been on optimizing production and productivity, augmenting export of marine products, generating employment and improving the welfare of fishermen and their socio-economic status. Fishing efforts are largely confined to the inshore waters through artisanal and mechanized sectors. About 90 per cent of the present production from the marine sector is within a depth range of up to 50 to 70
    metres and the remaining 10 per cent from depths extending up to 200 metres. While 93 per cent of the production is contributed by artisanal and motorized sectors, the remaining seven per cent is contributed by deep sea fishing fleets confining their operation mainly to the shrimp grounds in the upper east coast."

    On indian fisheries:
    http://www.hinduonnet.com/businessline/2001/08/03/stories/080305g1.htm
    http://www.fao.org/documents/show_cdr.asp?url_file=/DOCREP/006/Y4849E/y4849e09.htm
    http://countrystudies.us/india/107.htm

    From the Indian "Integrated Fisheries Project":
    "Experimental Deep Sea Fishing to test commercial feasibility:
    As more and more fishing effort to be diverted to areas beyond traditional fishing limits, the expertise available with the Project has to be deployed to conduct intensive fishing operations in grounds where sizeable resource potential is indicated through exploratory surveys by vessels of Fishery Survey of India. Such intensive fishing would generate data needed to make investment decisions by entrepreneurs besides demonstrating to the industry the technology suitable for exploitation of such reserves."

    Cheers.
     
  2. RANCHI OTTO
    Joined: Apr 2005
    Posts: 1,042
    Likes: 37, Points: 0, Legacy Rep: 535
    Location: TRIESTE (ITALY)

    RANCHI OTTO Naval Architect

    Guillermo is a precious source of informations..thanks!
     
  3. khokan
    Joined: Nov 2004
    Posts: 6
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: india

    khokan Junior Member

    Can anyone help me with the basic fundamentals of Ship Hull Detail Design? i want to know about Ship Hull Detail Design in detail. if u have any softcopy of books/documents

    Thanx in advance for ur reply.
    Regards
    Khokan
     
  4. PNACS
    Joined: Jul 2004
    Posts: 31
    Likes: 3, Points: 0, Legacy Rep: 30
    Location: Mumbai

    PNACS Naval Architect

    Principles of Naval Architecture: Volume I - Stability and Strength ( Add to shopping cart )
    Author: Edward V. Lewis, Ed.
    The Societys premier reference work, a revision of the 1967 publication on naval architecture covering ship's geometry, stability, flooding, strength, resistance and propulsion, vibration, ship controllability and motion in waves. A must-have reference for anyone involved in naval architecture.
    [PNA I] 1988, Hardbound, 3 lbs.
    ISBN # 0-939773-00-7
    List Price: $105.00
    visit www.sname.org
     
  5. SailDesign
    Joined: Jan 2003
    Posts: 1,964
    Likes: 125, Points: 73, Legacy Rep: 650
    Location: Jamestown, RI, USA

    SailDesign Old Phart! Stay upwind..

    I'd like to add my vote to that one. Guillermo is amazing.
    Steve
     
  6. Guillermo
    Joined: Mar 2005
    Posts: 3,644
    Likes: 188, Points: 63, Legacy Rep: 2247
    Location: Pontevedra, Spain

    Guillermo Ingeniero Naval

    Stev & Ranchi: Thanks a lot, but stop the crawling....:p

    shoaib: Something for you: Not within your strange specs, but a modern deep sea stern trawler (You'll have to learn some Spanish, sorry :rolleyes: )

    DESCRIPCIÓN: Pesquero congelador de arrastre por popa
    AÑO DE CONSTRUCCIÓN: 2002

    CARACTERÍSTICAS PRINCIPALES
    Eslora total 55,64 m.
    Eslora entre perpendiculares 49,45 m.
    Manga 11,60 m.
    Puntal a la cubierta principal 7,90 m.
    Puntal a la cubierta segunda 5,20 m.
    Calado de trazado 5,20 m.
    Arqueo bruto (1969) 1.222 GT
    CLASIFICACIÓN
    LRS+100A1, Stern Trawler, + LMC, UMS
    CAPACIDADES
    Bodega 884 m³
    Combustible 211 m³
    Capacidad de agua dulce 76 m³
    Aceite 3,4 m³
    POTENCIA Y VELOCIDAD
    Motor principal WARTSILA 2.760 Kw
    Velocidad en pruebas 14,00 nudos
    Autonomía 6.500 millas
    Grupos auxiliares 2 x 632 Kw
    Alternador de cola 1200 Kw
    TRIPULACIÓN
    Dotación 18
    PLANTA DE CONGELACIÓN
    Capacidad para congelar 77 Tons. por día en 11 armarios de placas de 15 Tons. por día en túnel de congelación
     

    Attached Files:

  7. shoaib_jaff
    Joined: Apr 2006
    Posts: 20
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: india

    shoaib_jaff Junior Member

    guillermo,
    thanks for the valuable information!
    i have couple of questions regarding the design problem (dont misunderstand me i am a learner)

    which one is better sections for trawler: normal/ knuckle / u / v?

    which one is used bulbous / racked bow for trawlers in modern design?

    why a slight rack is given for a keel in trawlers? ( i have seen in some design)

    do we use a skeg for better maneouverability in modern design of trawlers? (now-a days bow thrusters are mostly used)

    which one is used in modern design: a sheer deck or a forecastle deck?

    is camber necessary for trawlers?
     
  8. PNACS
    Joined: Jul 2004
    Posts: 31
    Likes: 3, Points: 0, Legacy Rep: 30
    Location: Mumbai

    PNACS Naval Architect

    Hi Shoib,

    Being a Naval Architecture Student you shoud be able find answers to all these questions by yourself from basics you have learnt over last 6-7 semesters. For example, raked Bow OR bulbous bow?. You could find the answers from basics you have learnt in resistance part of Naval architecture (Remember..... or flip back to those chapters in PNA, the advantage of bulbous bow is for a certain rage Froud Number). Cant you work out hull form by iterating/optimizing between effect of LCB on resistance, Required forward hold volume, angle of entrance etc etc).? The Skeg is for directional stability. Skeg will not add to maneouverability of your vessel. Based on Class rules, find minimum bow height required & decide if u need a forecastle deck.

    All the Best!!
     
  9. Guillermo
    Joined: Mar 2005
    Posts: 3,644
    Likes: 188, Points: 63, Legacy Rep: 2247
    Location: Pontevedra, Spain

    Guillermo Ingeniero Naval

    Questions, answers & present.

    shoaib_jaff:

    which one is better sections for trawler: normal/ knuckle / u / v?
    which one is used bulbous / racked bow for trawlers in modern design?


    U sections. Bulbous bow for long rangers, but as you are talking about a 1 day trip :confused:, you really don't need it.

    why a slight rack is given for a keel in trawlers? ( i have seen in some design)

    To create space to locate a big diameter propeller, if I understood your question correctly.

    do we use a skeg for better maneouverability in modern design of trawlers? (now-a days bow thrusters are mostly used)

    If you use a rudder, you usually use skegs to support it with this type of vessels, if I properly understood your question. :confused:

    Ducted propeller, rudder and bow thruster are nowadays commonly used.

    which one is used in modern design: a sheer deck or a forecastle deck?

    Or even a full length sheltered working deck with net whinches forward. Depends on net handling system and working space needings. You have to work out that.

    is camber necessary for trawlers?
    For weather decks, yes. Usually it's given to all decks.

    Attached find a present for you. The lines of a 36 m LOA stern trawler.

    Hope this is useful. I think you now ow me $.20 ;)

    Cheers.
     

    Attached Files:

    • gg.jpg
      gg.jpg
      File size:
      738 KB
      Views:
      5,505
  10. SailDesign
    Joined: Jan 2003
    Posts: 1,964
    Likes: 125, Points: 73, Legacy Rep: 650
    Location: Jamestown, RI, USA

    SailDesign Old Phart! Stay upwind..

    I'll give Guillermo an A for this homework assignment :)
     

  11. shoaib_jaff
    Joined: Apr 2006
    Posts: 20
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: india

    shoaib_jaff Junior Member

    i thank everybody for helping me in one way or the other

    special thanks to GUILLERMO

    i had enough from him for starting my project, now no more question will be asked by me.
    i will contact you again guillermo, if needed.........
    you helped me from the scratch....
    with all your support i will be able to design a better trawler
    regarding the $0.2, i can send you a copy of my project when its complete, just send me our mailing address.
    thanks again...............
     
Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.