Scarfing Ratio

Discussion in 'Wooden Boat Building and Restoration' started by mugsman, Feb 12, 2012.

  1. mugsman
    Joined: Feb 2012
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    mugsman Junior Member

    Looking at scarfing some Sitka spruce together for stringers. Anyone suggest the best ratio - 1 in 12, 1 in 16, etc.
    Thanks again
     
  2. daiquiri
    Joined: May 2004
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    Location: Italy (Garda Lake) and Croatia (Istria)

    daiquiri Engineering and Design

  3. mugsman
    Joined: Feb 2012
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    Location: Canada

    mugsman Junior Member

    Thanks for the information; interesting reading indeed. Looks like it can be summarized as 8 to 1 minimum.
     
  4. daiquiri
    Joined: May 2004
    Posts: 5,373
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    Location: Italy (Garda Lake) and Croatia (Istria)

    daiquiri Engineering and Design

    Even 6:1 (minimum) can be ok for frames and keels, if you have good woodworking and glueing skills. Below that, a scarf should be reinforced.
     

  5. PAR
    Joined: Nov 2003
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    PAR Yacht Designer/Builder

    As pointed out the 8:1 thread, the ratio depends on a few factors. Lightly loaded and/or bent elements can use a steep slope scarf, but more heavily loaded and/or tighter radius bends require a shallower slope.

    Try to position the scarfs in relatively flat, straighter areas of the stringers if possible.
     
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