Trimaran Design

Discussion in 'Multihulls' started by rapscallion, Feb 18, 2007.

  1. Chris Ostlind

    Chris Ostlind Previous Member

    Sure. Please include your email address when you do.
     
  2. henrikb
    Joined: Jul 2002
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    henrikb Senior Member


    Thanks for the kind words!

    Yes, we use Rhino ans SolidWorks for detailed design, this is what I have at the office...

    The amas seems to need at least 200%, we have been working more on the displacement and CB and found out that maby we will build the boat not that wide... It looks like there will be a problem to get enough displacement in the amas fo be able to prevent nose diving due to driving force from the sails! If the boat is too wide, there will be a lot of RM which will make it possible to maby push too hard.
    We are hoping to get some numbers on driving force/heeling force from the sail designer. During the time we are putting an excel sheet together to simulate the situation...
     
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  3. jamez
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    jamez Senior Member

  4. rapscallion
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    rapscallion Senior Member



    I love the looks of the center hull! It looks like the designer tried to maximize volume but still managed to keep the center hulls wetted surface narrow.

    Do they perform well?
     
  5. jamez
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    jamez Senior Member

    I'm not aware of any sailing here. I've emailed the designer for more info......
     
  6. Viper2
    Joined: Feb 2007
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    Viper2 Junior Member

    I am also looking at a Tri-design... I have a question though.. I am not sure If your looking for a day sailor w/o interior that is fairly sizable, but I cannot seem to find any that are basically a huge trampoline lol. I don't need interior space because It will be for hours on the water, not days.

    how hard is it to design a boat yourself?
     
  7. Chris Ostlind

    Chris Ostlind Previous Member

    Experience


    Well, Viper, it's not especially hard, once you know all the issues involved in the design framework. Acquiring that knowledge is the "hard" part of the equation in all this.

    Start with a design brief as developed by yourself and your Dad that covers the major hit points of your needs with a boat such as this. Then, look around on the Web for existing designs that might just work for you in this regard. If you find nothing that meets your needs, then start looking at designers that seem to have your interest at heart... guys that can relate to your personal desires and are willing to develop a specific design that will meet those needs.

    Lastly, will they work with you throughout the build process of your boat, adjusting specific details as they arise, so that you arrive at a boat that meets your collective interests and addresses the items, conclusively, from the design brief.

    I don't want to sound negative on this at all, but perhaps the single largest issue before a home boatbuilder is the budgetary requirements of the build style. Get a handle on the various styles of building and weigh them against your potential budget capacity and skill sets before you lift a finger in the direction of starting the build.
     
  8. rapscallion
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    rapscallion Senior Member




    Chris,

    I really like the looks of the TC 660. I was thinking if an 8M version that would have a bunk under the cockpit and 5"11 standing head room, folding amas like the L7 (if it doesn't kill the interior) or a folding method that would allow someone to motor into a slip with the amas folded.
    Is this even possible? or would it kill the performance too much....

    I was hoping to build it using farriers approach. Build half of the hull and flip the mold and build the other half. This would be my second build... my first build will be a small 2 person trimaran like yours of tremilio (sorry about the spelling)

    Let me know if this is possible Chris... maybe we can talk about it.
     
  9. Chris Ostlind

    Chris Ostlind Previous Member

    Let's look at it

    Raps...

    Write me off list at: Chris at Wedgesail dot com

    We can discuss the potential there.

    Chris
     
  10. rapscallion
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    rapscallion Senior Member

    sent you an email....
     
  11. rapscallion
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    rapscallion Senior Member



    take a look at the gus 2300

    I was thinking of making a center hull and using a hobie 18 as a donor boat for the amas and rig. Maybe pull all of the good features from the F22 and for the first center hull use a ply hard chine construction..... Does a center cockpit really give better performance on a tri?
     
  12. Doug Lord

    Doug Lord Guest

    Performance Trimaran

    If you want to try to understand the design elements of a really high performance small tri go to the Exploder site and read the technical details of that boat. I haven't seen a boat anywhere to compare with it....(thread in this forum)
    Some of the key elements could be incorporated into a tri with more interior room in the main hull. I think you're pushing it to try to get 5'11" of headroom in a tri under 24-26' unless you're willing to go with a pop top and/or settle for a lot less performance than is possible with a state of the art tri like the Exploder. Looking at the details carefully can help you see what the performance tradeoffs are.
     
  13. Chris Ostlind

    Chris Ostlind Previous Member

    Ooof!

    Raps,

    I'd really suggest that you forget about trying to build an Exploder style of boat with the typical homebuilders kind of budget. That boat, while very cool in many aspects, is well beyond the reasonable when it comes to building your own boat from beach cat donor hulls.

    There's absolutely no point in building a carbon/foam vaka hull to that style when you are going to, potentially, join production glass sandwich amas donated from a typical beach cat. Production cats are made to take a beating season after season in harsh and less than professional use cycles and are designed to that end. Race ready components at the same build quality as the Exploder are decidedly different in weight, cost and application.

    You don't need to build to the Exploder level to beat beach cats. You can do it with a nicely designed and built trimaran that is carefully specced-out to include many, easily obtained components along with a carefully chosen rig with fresh sails cut for the sailing potential of the tri.

    You can get a 5' 11" headroom design in the size (8m LOA) that you indicate, but it may require you to recognize that you are going to be giving away a measure of windage drag and boat weight in the process. That will inevitably compromise your ability to achieve the speeds you desire.

    So you make a compromise, or two, in your design needs... so what? After all, it's your boat, you're going to build it and it should do what you want it to do, or what's the point?

    You'll need to decide whether the chase for ultimate speed is more important than the chase for more, on-board comfort. You are simply not going to get the cruising style amenities in this boat along with performance without adding weight and entering the design spiral that will pull cash out of your pocket. You have mentioned an 8 meter boat. That means that there will be extremely few beach cats that can wax you in a drag race anyway, as along as you do not overload your boat and you sail it reasonably well.

    Eventually, you'll get to the place where a decent used Corsair will fill your needs, give you acceptable performance and you won't have to build a thing. You simply trailer the boat back to your driveway.

    Make a list of the stuff that is important to you in descending order. Stuff like your budget, your needs, your expectations and the utility that the boat should represent for you. Once yo get that pulled together, you'll begin to see what kind of boats/solutions will fit into your envelope of acceptability.

    The Exploder sits at the "way out there" extreme far end of the envelope when it comes to small trimarans. It is a no compromise, high dollar, full-tilt race boat. Try to keep that in perspective when you consider your interests. For some reason, there are those that think that every boat needs to be built to that end of the design envelope to qualify as appropriate. It is simply not true. There are plenty of possible designs that could be used to solve your needs that go nowhere near the end of the spectrum where you find the Exploder tri.

    Chris
     
  14. Frankh78
    Joined: Sep 2015
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    Frankh78 Junior Member

    Sorry to steal this thread..
    I am looking for a suitable design to build a trimaran of about 20'.
    I ordered the scarab 650 plans but then I came across the Z65 design and I like the idea of using Nacra gear. Just build one hull iso three;)
    Are there already plans for sale of the Z65?
     

  15. redreuben
    Joined: Jan 2009
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    redreuben redreuben

    Frank, despite producing some really exciting concept renders that is as far as the Chris O boats got. Stick with the Scarab. Or the Buccaneer 24 which has it's own threads here.
    RR.
     
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