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    North Sails' J/109 Tuning Guide

    Base Settings for 10-15 knots True Wind Speed

    Headstay Mast Butt Upper Shroud V1 Lower Shroud D1 Intermediate Shroud D2
    2220mm 480mm 50 Units 45 Units 22 Units
    © North SailsHeadstay is measured using swing arc method. Use jib halyard pulled down to top of black band on mast - swing forward to mark headstay. Measure distance from mark on headstay to deck at stem.
    © North SailsThe mast butt is measured from forward face of mast to aft edge of bulkhead. This corresponds to forward most position in the slider.

    Shroud Adjustments Matrix

    True Wind
    Speed
    Upper
    Shroud
    V1
    Lower
    Shroud
    D1
    Intermediate
    Shroud D2
    0-13 knots
    11-20 knots
    20+ knots
    -1 turn
    Base 50
    +2 turns
    -1 turn
    Base 45
    +1/2 a turn
    -1 turn
    Base 22
    +2 turns

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