Unsinkable Boat

Discussion in 'Boat Design' started by hafiz, Sep 22, 2006.

  1. hafiz
    Joined: Sep 2006
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    hafiz Ehsanul Hafiz

    A stubborn end user for Patrol Boat has asked for the boats to be of "Unsinkable Type:confused: , Self Bailing & Self Righting". Can anyone suggest the best way to deal with these requirements?

    Other requirements are, Alluminum Hull, 4 ton Payload (including 16 Persons), 25 Knot Cruising Speed @ full payload, ability to survive sea state 5/6, length 12-14 meters, propeller driven, inboard engine. Mono hull and catamarans, both are acceptable.

    I am a nobody :( in boat design field so I would highly appreciate suggestions from your pro's assuming that reasoning with the end user will not work and I want this deal very badly.
     
  2. Figgy
    Joined: Feb 2006
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    Figgy Senior Member

    Here it is, everything you ask for and some.


    Make the check out to Figgy :)
     

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  3. hafiz
    Joined: Sep 2006
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    hafiz Ehsanul Hafiz

    Thanks figgy. Amazing that you could even post an attachment !!

    Who manufactures these?
     
  4. hafiz
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    hafiz Ehsanul Hafiz

  5. KnottyBuoyz
    Joined: Jul 2006
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    Location: Iroquois, Ontario

    KnottyBuoyz Provocateur & Raconteur

    If I'm not mistaken the design is owned by Raytheon corporation and licensed to numerous builders world wide. We, Canadian Coast Guard, have about 50 of them by a number of builders across Canada. USCG probably has 4 or 5 hundred of them by now. The original design was kevlar but aluminum is much more practical. We've bounced them off of rock breakwaters with narry a scratch!

    Rick
     

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  6. Figgy
    Joined: Feb 2006
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    Figgy Senior Member

    Not that many yet...

    They (the 47's) are replacing the 44s. An interesting note about the 47s; if overturned, the vessel will return to an upright position in 8 seconds or less.
    Sweet.
     
  7. jehardiman
    Joined: Aug 2004
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    jehardiman Senior Member

    My God! Someone wanting a "Patrol Boat" capiable of carrying a combat/swimmer squad thinks it might actally get shot at! What is the military thinking? Have the given him a medal yet?....:D

    Yes you can do this even cheaper than an MLB. There a vendor that offers that type of hull. No, I do not work for them, but they are a hometown company.

    If you have any questions feel free to contact: SAFE Boats International, Norseman Marine Products Inc, or the United States Patent Office for a copy of the following Patents. #5,282,436 and #5,647,297, and 5,870,965.

    [​IMG]

    Edit to add: MLB's are not self bailing (they sank the first new one during testing) and SAFEBoats may not be self-righting, but now you have all the pieces.
     
  8. longliner45
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    longliner45 Senior Member

    jc 31 made of airex ,13 airtight compartments ,blown with polyurethane foam,twin volvos with duoprops ,6000 lb payload in center of gravity ,20 knots loaded,1gallon per hr, at 3300rpm,,,,,also I am nobody in boat design network,,,just a proven user of thiis product.....longliner
     
  9. hafiz
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    hafiz Ehsanul Hafiz

    A few of the boats are actually expected to work in Sudan & Ivory coast on UN Peace Keeping mission.

    Thanks a lot Figgy, Knotty, Jehardiman & Longliner I think I have sufficient material :idea: in hand to go forward. You guys have been of great help:) :) .
     
  10. longliner45
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    longliner45 Senior Member

    let us know what you choose,longliner
     
  11. hafiz
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    hafiz Ehsanul Hafiz

    I sure will. This will probably be a one of its kind boat :)
     
  12. alex fletcher
    Joined: Jun 2006
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    alex fletcher Junior Member

    Hafiz sounds like your looking for intrinsic Stability i would think about this Design your boat as it where full of water use a number of sealed buoyancy compartments make the draft about half of the beam ensure the centre of gravity is below the Buoyancy compartments and the Meta-centric height is as far as possible above the COG it will self right and float when full of water. With this kind of design recq. make a scale model and tank test it
    Regards Alex
     
  13. hafiz
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    hafiz Ehsanul Hafiz

    Thanks Alex. Most of what you said went way above my head as I am a nobody with regard to boat design. But I will forward your info to the people I am working with.
     
  14. marshmat
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    marshmat Senior Member


  15. longliner45
    Joined: Dec 2005
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    longliner45 Senior Member

    perhaps contacting USCG . and purchasing a good used 41 footer,,,,,thoses are good gunboats and very seaworthy,,,longliner,,,,,,,,,,,,,,,Mrarshmat,,those boats look more like raceboats ,,,remember they have a job to do,,,,,,,,not a easy job at that,,,love ya longliner
     
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