Laminate drawings and schedule for 52 ft coastal catamaran

Discussion in 'Multihulls' started by Ismotorsport, Mar 4, 2012.

  1. Ismotorsport
    Joined: Feb 2012
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    Ismotorsport Junior Member

    I would like to find out what and who others are using for laminate schedule and drawings. I have spoken with a few na about the project and it seems that there are many ways to go about it. Perhaps others here could share what they have found through there experiences.
    The boat is meant for coastal cruising and would be a wet hand layup over male plug using epoxy and glass / carbon reinforcement. 3/4 divinycell or 3/4 core cell foam cored.
    Max load weight is 22,000 lbs.

    In trying to find someone to help with the laminate drawings it seems most na have an engineer that does this work, is that correct?

    Thanks

    Ismotorsport@yahoo.com
     
  2. Alik
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    Alik Senior Member

    Laminate drawings and schedule... How about rest of drawings? How there design was made without knowing laminate and thus weight of structure?
     
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  3. Ismotorsport
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    Ismotorsport Junior Member

    Alik,
    The rest of the drawings are complete and available as is weight, hydro, sailplan, etc.
    I am just enquiring about getting help with laminate drawings and schedule based on the what has already been provided.
    Would also like to know what others have done and seen for laminate on this size boat.

    It seems there are some who think it is fine to go light on laminate vs others who say it should be heavier. Hoping to get a consensus.

    Thank you.
     
  4. Alik
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    Alik Senior Member

    So how other drawings are complete (say, hull shape) if weight of structure is unknown? We do laminate at preliminary stages, before final table of weights hull shape are defined. Moreover, structural arrangement is designed in conjunction with general arrangement/interiors/systems.
     
  5. Ismotorsport
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    Ismotorsport Junior Member

    That is correct... The interior structure/ arrangement is completed as well. The max load is 22,000 lbs as stated in original post. This is a coastal catamaran that has simple interior layout.
    What are your thoughts Alik on appropriate laminates for a boat this size and weight.

    Thanks
     
  6. Alik
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    Alik Senior Member

    Ask the designer of the boat.

    No reputable designer will give advise on laminates without knowing details of stiffening, etc. Lamination depends on panel size and available height of stiffeners.
     
  7. Ismotorsport
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    Ismotorsport Junior Member

    Thanks Alik... You've been most helpful...
    Provided stiffening has been thought though and designed into boat... What are some people like yourself doing with laminates on this size boat? As for asking my designer. This is a self designed boat with consultation from an NA for fine tuning hull design and designing the proper structure. I have received some laminate info but would like to enquire what others are using for projects in this size/weight range.
    Feel free to share your experiences with the catamarans you have built in this range.

    Thanks
     
  8. gonzo
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    gonzo Senior Member

    You can't have designed a proper structure without calculating the laminate schedule. The skin is structural and defines the rest of the structure. If a NA charged for consultation, he should have told you this from the start. The whole boat, including weights have to be recalculated.
     
  9. Ismotorsport
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    Ismotorsport Junior Member

    Laminate info from NA that I received:

    The materials I would like to use are Divinycell H80 and H100 core foam, Vectorply EBX1700 and EBX1200 both E-glass double bias fabrics, Vectorply ELT 1700 and ELT 1200p both biaxial e-glass fabrics, Vectorply C-L 1800 e-glass uni-directional.

    Would appreciate your comments on the above for this build... Is this considered a heavy or light laminate plan?

    Thanks
     
  10. gonzo
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    gonzo Senior Member

    It depends on the rest of the structure. You can have a heavy skin with little or no stiffeners, or a light skin with a lot stiffeners. Usually, it is something in between. The intended use of the boat also affects the structure design.
     
  11. Ismotorsport
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    Ismotorsport Junior Member

    Alike and Gonzo,

    I understand without seeing the plans its easy to say what does or doesn't need to be done. If you are truly interested in helping out a new forum member feel free to email me at ismotorsport@yahoo.com and I would be happy to show the structural and hull plans. And only then could you give me the actual advice I need. I cannot load a pic or file as I am using my iPad 2.

    Thanks
     
  12. gonzo
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    gonzo Senior Member

    The NA that took your money should be giving you this advice. It is possible to recalculate everything, but it involves at least a couple of days worth of work.
     
  13. luff tension
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    luff tension Junior Member

  14. Ismotorsport
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    Ismotorsport Junior Member

    Thank you luff,

    It's nice to actually get some information rather than some baseless comments. I thought this was a forum, that why I posted here. Seems like the peanut gallery is always the first to respond. Hopefully, if the thread is up long enough, some informed and cooperative member like luff will continue to comment.

    Thanks
     

  15. gonzo
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    gonzo Senior Member

    You are getting information you don't like. For example, the NA probably ripped you off if he "designed" something but didn't give you a laminate schedule.
     
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