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Thread: LWL for Catspaw

  1. #1
    Join Date
    May 2020
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    Amissville, VA
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    Default LWL for Catspaw

    Interior after Rivets.jpgExterior after Rivets.jpg

    I'm making progress on my first boat and now need to know how do I determine the LWL on a Catspaw dinghy. My profile view has a baseline with waterlines at 5 1/2" interval up after that, but no LWL.

    Thanks

  2. #2
    Join Date
    Oct 2008
    Location
    Walney, near Cumbria UK
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    51,264

    Default Re: LWL for Catspaw

    Here you go, through the bottom of the transom, at 6 1/2 "

    Design Specs

    Designer:
    Joel White and N.G. Herreshoff


    LOA:
    12' 8 3/8"


    Beam:
    4' 5 5/8"


    Draft:

    (cb up) - 6 1/2" (cb down) - 1' 8"


    https://www.woodenboat.com/boat-plan...catspaw-dinghy

    Put sheer on the boot top, a tad higher at the bow and you will be good.
    It really is quite difficult to build an ugly wooden boat.

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  3. #3
    Join Date
    May 2000
    Location
    Conway, MA
    Posts
    5,906

    Default Re: LWL for Catspaw

    I'd think if you ran a level line from top of the garboard at the stem to the bottom of the transom you would do well.

  4. #4
    Join Date
    May 2020
    Location
    Amissville, VA
    Posts
    70

    Default Re: LWL for Catspaw

    Thanks both for the reply. Common sense would dictate that the boat draws what is specified as the draft with the CB up. Unfortunately I lacked that at the time of inquiry. I apologize. I'm new to all this boatbuilding, but am thoroughly enjoying learning! (As well as Thad's new book)

    BTW Nick, what does "Put sheer on the boot top" mean?

  5. #5
    Join Date
    Oct 2008
    Location
    Walney, near Cumbria UK
    Posts
    51,264

    Default Re: LWL for Catspaw

    Quote Originally Posted by urumohr View Post
    Thanks both for the reply. Common sense would dictate that the boat draws what is specified as the draft with the CB up. Unfortunately I lacked that at the time of inquiry. I apologize. I'm new to all this boatbuilding, but am thoroughly enjoying learning! (As well as Thad's new book)

    BTW Nick, what does "Put sheer on the boot top" mean?
    The top edge of the boot top should curve up towards the bow and stern.
    Two reasons.
    It looks better respecting the curve of the sheer, a straight line would look hogged.
    It allows the boat to sit a little down by the head or stern, whilst keeping the topside paint free of scum staining.
    It really is quite difficult to build an ugly wooden boat.

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  6. #6
    Join Date
    Feb 2002
    Location
    Shubenacadie NS
    Posts
    4,986

    Default Re: LWL for Catspaw

    The upward curvature of the boot top should be more pronounced in the bow than in the stern. Otherwise, what Nick said is right.
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    -Henry David Thoreau-

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