Sailing Class


Interpretations of the Chief Measurer

1.  Hull and Deck Dimensions                                   Adopted:  Prior to 10-Mar-91

Measurement of boat dimensions are taken from the imaginary intersection of the hull and deck (where applicable).  Rub rails are specifically excluded.

2.  Sail Measurement Points                                      Adopted:  Prior to 10-Mar-91

                                                                                           Revised:  January 1994

For purposes of sail measurement, the tack, clew, and head are taken at the imaginary intersection of the sail edges.  For example, the head of the sail is found by extending the luff and the leech until the extensions cross, independent of the halyard attachment eye.  The extension lines can be thought of as infinite lines that touch the edge of the sail at two or more points.  The extension lines must enclose all ropes and tapes.   If multiple lines can be constructed, the lines shall be used which result in the shortest luff, leech, or foot measurement.

The only exceptions to this are noted in Interpretation 3 below.

3.  Mainsail Measurement Points                             Adopted:  Prior to 10-Mar-91

For purposes of measuring the luff of the mainsail, the two edges extended to determine the head are the top of the headboard and the luff.  For purposes of measuring the leech of the mainsail and determining the mid girth point, the two edges extended to determine the head are the top of the headboard and the leech.

4.  Allowable Equipment When Weighed              Adopted:  Prior to 10-Mar-91

To weigh a boat, the following equipment may be included, but must, if included during the weighing, be on the boat whenever she is racing:


      1. spinnaker pole

      1. whisker pole

      1. spinnaker sheets

      1. jib sheets

      1. main sheet

    5.  Spinnaker Hoist Measurement                           Adopted:  Prior to 10-Mar-91

    For purpose of measuring the spinnaker hoist, the measurement shall be taken from the deck to the bottom of the sheave that turns the halyard.

    6.  Jib Foot Roach Measurement                                  Adopted:  November 1991

    For measurement of the jib foot roach in Article V Section 1, the sail may be flaked once above the line connecting the tack and clew.

    7.  Deck and Hull Construction Methods                      Adopted:  February 1993

    In order to avoid presentation in detail of the proposed construction methods and materials prior to construction, a deck must meet the following specifications:

    Material :      Solid Wood 7/16″

    Deck Beams: 1″ x 2″ Spruce at 12″ intervals

    8.  Hollows                                                                                       Revised: 14-Mar-94

    A hollow in the edge of a sail between adjacent batten pockets, the head point and adjacent batten pocket, or the clew point and adjacent batten pocket at a measurement point shall be bridged by a straight line and the measurement taken through the measurement point to the bridging line.

    9.  Batten Positions                                                                     Adopted:  14-Mar-94               

    The batten lengths are specified in Section 2 of Article V Sails.  The battens may be positioned anywhere on the leech of the sail and still “be of the type as shown on the plans”.

    10.  Clew Plate                                                                               Adopted:  30-Apr-94               

    The clew attachment of the jib may be a single grommet or a clew plate with multiple attachment points.  Clew plates are subject to the following limitations:

    1. Not more than six inches in any direction;

    2. Does not alter the clew measurement point;

    3. Does not add to the foot roach that the sail supports; and

    4. Does not alter the curve of the leech by functioning as a batten.

    11.  Deck and Hull Repair                                                           Adopted: 15-Jan-95

                    Revised: 16-Nov-2002

    Although new fiberglass decks must come from an approved builder, any person can repair a fiberglass deck to approximately its original appearance and shape.  Persons contemplating more than simple repair must seek the prior approval of the Chief Measurer and describe the nature and method of the repair completely.  The repair must meet the following minimum requirements:


        1. After repair, the hull and deck must be capable of fitting back into its original mold, i.e. the repair must not modify the shape on the outer (gelcoat) side in such a way as to interfere with the body of the mold;


              1. After repair, the boat must contain at least the amount of flotation as when it was built.  If foam has been removed after the original manufacturing date, it must be replaced at this time;

              1. The materials used in the repair must be equal to or greater than the original materials in weight, thickness, and strength; and

              1. The interface between the repaired area and the original deck must be carefully sealed to avoid water intrusion into the core of the deck or hull.

        12.  Spinnaker Block                                                             Adopted: 05-May-2001

        The spinnaker block must be mounted to the front of the mast without any attempt to extend.

        13.  Spar Extrusions                                                                     Adopted 27-Nov-04

        Spar extrusions may not be cut away, other than openings just sufficient for through-fittings, at any point inboard of the outer edge of the racing bands.

        14. Deck Material or Static Equipment                                   Adopted 12-Feb-05

        Material and/or static equipment which is affixed to the deck during racing is part of the deck for purposes of Specifications Article III, Section 9 Deck Requirements.

        15. Jib Foot Cords                                                                              Adopted -Feb-05

        Material and/or static equipment which is affixed to the deck during racing is part of the deck for purposes of Specifications Article III, Section 9 Deck Requirements.

        16. Boom Vang                                                                           Adopted -Ap-07

        A boom vang is shown in the Official Plans and is not “rigging made purposely to bend (the spars)” within the meaning of Paragraph 2 Boom of Article IV Spars and Rigging of the ISCA Specifications.

        17. Chine Radius                                                                             Adopted 26-Jan-19

        15. Chine Radius: The ¼” radius specification of “detail X” on sheet six of the plans is interpreted as the minimum radius of any hull or transom chine.

        18. Electronic Compasses                                                             Adopted 26-Jan-19

        Currently, the Micro Compass by Raymarine (formerly known as the TackTick Micro Compass) and Prism by Velocitek comply with Section 14d of Article III of the Specifications and are allowed while racing.