Single skin fiberglass hull construction info.

Discussion in 'Boat Design' started by sailor182, Jun 12, 2013.

  1. sailor182
    Joined: May 2013
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    sailor182 Junior Member

    Anyone know of any good books/articles on solid fiberglass hull construction. Any info is helpful. Thanks
     
  2. tunnels

    tunnels Previous Member

    solid glass hull bottom with cored top sideds ??

    Single skin as in one skin of glass ???
    Ok tell us what sized boat are you looking at and what's it used for and what kind of conditions etc etc
    what you using for internal framing , bulkheads ?, stringers ?and how many ?inboard ?out board ? sterndrives what kind of hp you talking !! and what kind of speeds you hoping for ??
    Or you building a yacht !!:?:
     
  3. sailor182
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    sailor182 Junior Member


    boat- 25 to 28 sailboat
    internal framing- . bulkheads
    Motor- outboard 10hp
     
  4. FAST FRED
    Joined: Oct 2002
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    FAST FRED Senior Member

    With almost zero engineering LLOYDS will give the thickness required for a single skin boat, built with a chopper gun.

    Any refinement in construction , mat & roving , or internal bracing is a reduction in required thickness.
     
  5. tunnels

    tunnels Previous Member

    Ok a few more steps now we know what you are looking at !!
    Will it be a family cruising type boat ?
    with bunks and a vee birth up forward and a seating in the saloon area with a couple of berths at the back under each side of the deck ?
    The out board on a rise and fall stainless steel bracket so when sailing its up out of the water ?? Keel what kind of keel ?? internal ballast with a centre board or a lead keel lift up and down or fixed with a lead bulb ??
    Or a sailing go fast and almost nothing inside only the barest essentials ?

    you want the boat made all out of solid glass that will be a heavy boat !!
    or cored top sides and solid bottom that will start to lighten it a little !!
    What about cored all over but higher density in the area below the water line and a lighter slightly thinner for the topsides above the waterline ??

    Have you worked with glass before ?? you understand the 3 resin systems
    Polyester , Vinylester , and epoxy ?? what about vacuum bagging etc :?:
     
  6. Eric Sponberg
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    Eric Sponberg Senior Member

    If you want the basics of traditional construction with mat and woven roving, then you can get the book "Fiberglass Boat Design and Construction" by Robert J. Scott. A new edition is available from on-line book sellers. I will tell you how to engineer a laminate for either solid fiberglass construction or cored construction.

    Or, for a more up-to-date manual, you can also download "Marine Composites" by Eric Greene. It is available for free on his website: http://www.ericgreeneassociates.com/images/MARINE_COMPOSITES.pdf.

    There are many instances where solid fiberglass construction is perfectly reasonable and acceptable over cored construction. It's up to you to decide. These books will help you figure that out.

    Eric
     
  7. SamSam
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    SamSam Senior Member

    .

    This is good.

    [​IMG]

    http://www.boatdesigns.com/Books-Manuals-Calendar/products/920/

    .
     
  8. SamSam
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    Location: Coastal Georgia

    SamSam Senior Member

  9. Tad
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    Tad Boat Designer

  10. gonzo
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    gonzo Senior Member

    The majority of the thousands of boats sold are built with solid core. It is a method that gives adequate weight and strength for most applications.
     
  11. tunnels

    tunnels Previous Member

    still need answers to all the questions but !!
     
  12. philSweet
    Joined: May 2008
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    philSweet Senior Member

    I'd start with Gerr's Boat Strength. It gives scantling rules, and perhaps more importantly shows how the rules work to keep parts in balance. It's basically a boat cook book. Sometimes that's good, sometimes what you want isn't on the menu.
     
  13. sailor182
    Joined: May 2013
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    sailor182 Junior Member

    thanks guys I ordered "Fiberglass Boat Building for Amateurs".
     
  14. tunnels

    tunnels Previous Member

    Still need answers to ALL the questions !! if you read them you will need answers that you could find in a book but may not answer 100 % or give you the best options .
    Because its a sail boat id be looking for strong yet light so id be using core in virtually the whole hull from Gunnel to gunnel but making a simple but very effective internal frame system for the keel to carry the loads down around and in that area not forgetting the downward pressure applied by the mast into the guts just forward of the keel area . Remember the fore stay and back stays are wanting to pull the ends of the boat up the side stays are wanting to pull the sides up and the mast is wanting to push everything down really hard in the middle . so end to end side to side its all got to be linked and tied together to carry tremendous loads !!
    Sail boats are nothing like power boats to build ,so what you see for one does not necessarily apply to the other , same with the glass used its different as well . plus the internal structure is vital to transfer loads , a power boat is nothing like what a yacht is not at all .
    Don't dismiss the use of a sail drive unit instead of a out board . they are really efficient and effective ,much batter than a out board for pushing and folding blades so not much drag
    So need answers to the questions I posed a while back !!:D
     

  15. sailor182
    Joined: May 2013
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    sailor182 Junior Member

    "Will it be a family cruising type boat?" I want it to be able to sail single handed I.E self tailing winches and lots of rope clutches. That being said I am aiming for three berths one full v berth and two singles under the cock pit.

    "The out board on a rise and fall stainless steel bracket so when sailing its up out of the water?" Right now I'm debating whether to go with a bracket or a well in the cockpit. I like the idea of being able to rise it out of the water when sailing but I also like the idea of it being sheltered in a well. Thoughts?

    "what kind of keel ?? internal ballast with a center board?" Here's where i might lose you.... I'm seriously considering a water ballast with a weighted dagger board "dagger board with a bulb" because it is going to be a trailer sailer the ability to loose tons of weight for towing would be amazing.

    "you want the boat made all out of solid glass that will be a heavy boat!!" True I didn't understand how true until I did the math foam core really cuts the weight down it also makes the the mold easier to build. I'm starting to lean toward foam core.

    "Have you worked with glass before?" Just small repairs nothing in the scope of build a boat. I do plan to start small building a few dinghies to get the process down. I do understand the three systems.
     
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