Bolger's Prince William Sound Yawl

Discussion in 'Boat Design' started by Tom Painter, Jun 11, 2020.

  1. Tom Painter
    Joined: Jun 2020
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    Location: Maine

    Tom Painter New Member

    Hi gang,

    I hope I have posted this in the right area...

    I'm thinking about building Bolger's PWSY from Different Boats. The design brief was for a light weight beach cruiser that could be car-topped. The original construction detail (IIRC) was two courses of 1/8" cedar double diagonal sheer to sheer. No inside stringers(!) which seems very, very light, maybe too light. I can't remember if he called for a sheathing as I don't have the book in front of me (on vacation), just some scans of the lines, construction plan & sail plan.

    Anyway, I was thinking about building her foam core fiberglass because she's a bear of a shape to make in any wood method, but I'm much more knowledgeable about wood construction than glass composites...

    What would be some appropriate scantlings?

    3/8 divinicell core (H80?)

    What should the skins be? Would 2 layers of 10oz FG cloth inside and out be adequate? Keep in mind she's a light weight 16' (680# disp) car top beach cruiser.


    [​IMG]PWSY model by T P, on Flickr

    [​IMG]PWSY sail plan by T P, on Flickr
  2. fallguy
    Joined: Dec 2016
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    Location: usa

    fallguy Senior Member

    If you didn't sheath the original; it'd be short lived.

    I'd say your lamination plan is a bit light on the glass. All I can offer. Definitely going to need some stitch fabrics.

    you might need to give the details like length on water, beam, etc., even then developing the boat from ply unknowns to foam is really not just dartboard stuff

    I am only smart enough to tell you you are too light. You also need to use some HD foams, etc.
  3. Tom Painter
    Joined: Jun 2020
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    Location: Maine

    Tom Painter New Member

    Here's the original construction plan.

    She's 16.25' LOA, 4.5' Beam

    [​IMG]PWSY construction by T P, on Flickr
  4. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    I don't usually like Bolger's designs, but that is a beauty. Get Dave Gerr's book for scantlings and reinforcements. It's a cookbook system where you simply enter the boat's dimensions and the formulas give you everything you need.
  5. Tom Painter
    Joined: Jun 2020
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    Location: Maine

    Tom Painter New Member

    Yeah, I've got it sitting at home on my bookshelf...
  6. JSL
    Joined: Nov 2012
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    Location: Delta BC

    JSL Senior Member

    "car-topped?" make sure you have a large car and the proper setup to load the boat.

  7. Squidly-Diddly
    Joined: Sep 2007
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    Location: SF bay

    Squidly-Diddly Senior Member

    See my latest post.
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