Designing the Powered Trimaran The Tomoe Gozen

Discussion in 'Boat Design' started by Tomoe Gozen, Apr 8, 2014.

  1. Tomoe Gozen
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    Tomoe Gozen New Member

    My dream is to design and build a trimaran that i can live on with my best friends and we can travel the world but im not a millionaire so funding will be a challenge, but thats not the point im determined to get this done i have a rough design on paper but i really dont know how to go about building it i think i wanna use fiberglass shes going to be a 108' long for the main hull i was thinking for the wings they could be 60 feet i the idea is to make it so they can have a room in it and room for a seadoo or something like that retract close to the ship for easy storage when anchored and for when we wanna go fast i really want to make it as fuel efficent and green as possible but still have power yea just a rough idea but if someone could give me an idea on where to start i would really be greatful maybe advice on ways to keep weight down anything would be amazing
  2. Doug Lord
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    Doug Lord Flight Ready

    suremakesithardtoreadwithnopunctuation good luck and welcome to the forum
  3. nimblemotors
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    nimblemotors Senior Member

    You can start by building a small scale model, or maybe a 8ft row boat.
  4. messabout
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    messabout Senior Member

    Your brief description sounds very much like a megayacht. For such a boat, be prepared to spend a dollar amount that includes six zeros or more.

    If you are serious about this, the first order of business is to engage a certified naval architect. Do not entertain any illusions about this reality. There are several ironclad reasons for working with a NA. Some of the reasons involve legality. You can probably "design" and build a 14 foot fishing skiff but self designing a 110 footer is out of the question. Believe it!

    You can find several credentialed NAs right here on the forum. If you need us to identify them for you we can do so.

    Disclaimer: I am not an NA, I have nothing to sell.
  5. Rurudyne
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    Rurudyne Senior Member

    Tomoe, sounds like you and I have somewhat similar fantasies.

    You may want to read up a bit about stabilized monohulls.

    As I understand it the demon behind many a seasickness is when the rolling boat imparts relatively rapid motions in the vicinity of the head, where our sense of balance is. Trimarans which have their accommodations lower (not all do) do tend to have favorable motions, for though they may be quick because of the wide stance they are not long and quick. Based on my reading a stabilized monohull, which has much smaller amas of about 10% or so total displacement should actually have a more gentle roll period because as she rolls the ama being forced deeper takes longer to counter, having less displacement.

    My own daydreams about something that big would have a 98' x 14' LWL main hull, which could easily be 108' once you've your stern and stem, would provide a fair amount of living space. I know someone will point out that a 7-to-1 LBR isn't really what some mean by stabilized monohull but aside from having a high LBR you can also employ relatively shallow draft to your beam to reduce wave making resistance (check out a paper called "Numerical and Emperical Study of Wave Resistance for Trimaran Hull Forms", hiper 08/HTML/Papers/11- Maynard_PRASANTA.pdf ) that may be usable instead. At any rate: there are lots of weak knees and also a handicapped sister that must influence my daydreams, so something needing less climbing up and down within it is a big, big part of that preference too.

    Moreover, with the lower LBR (and shallower draft for the displacement) you can give up more length while retaining a functional space for those (stair-less) accommodations (if you want, for example, 10' usable within the hull that may be possiblely easy to be had for well under 100', say 80 to 90' depending on how it is styled, less with a 6-to-1 LBR of course). This may be important because not being a millionaire and building your own 100'+ boat is one tough row to hoe, funding wise, as I'm sure you are already aware or are becoming aware.

    Additionally, some places have lengths below which you don't have to have one of their harbor pilots, a cost you may not want, and 108' is above that point for places like NYC. That would be just one sort of cost that some lengths of boats face which one not necessarily much shorter doesn't.
  6. Stumble
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    Stumble Senior Member

    First step is become a billionair. Then spend 100million designing and building this.

    Figure a yacht like this will cost around $500,000 a year minimum just to operate and maintain.

    I don't think you understand the scale of the project you have suggested.
  7. Rurudyne
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    Rurudyne Senior Member

    Wouldn't that be with a full/very large crew?

    And a hundred million -- while it just may be coincidentally an amount Congress "found" (that they had lost) some years back and members were positively drooling on how to spend the "windfall": why I rifle through my Congresscritter's couch whenever I visit his office -- will buy more than 100'.

    Well, unless you spend like Congress....
  8. Mr Efficiency
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    Mr Efficiency Senior Member

    Not the point ? No, it is the whole story right there, you cannot afford such a thing, no-where near it in fact. Unless your best friends want to tip in the millions, which seems unlikely to me. All I see is a reality dis-connect ! :D

  9. messabout
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    messabout Senior Member

    Is it likely that the OP is one of those wearisome trolls who hit and run? If not then he/she needs to enter the conversation a bit more seriously.
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