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1. Hull
That integral part of the boat constructed so as to provide buoyancy, by the containment of air, or the partial or complete exclusion /displacement) of water. Specifically excluded are spinnaker poles, bowsprits, wings, hydrofoils and rudder fittings.
2. Gunwale
The points at which the plane of the outside of the hull skin, or its extension, would or does, meet the plane of the top of the deck or its extension.
3. Outer Gunwale
The outer-most edge of the hull and deck excluding removable appendages.
4. Stem
The most forward extremity of the hull.
5. Deck
A two dimensional (2D) surface, (or near 2D surface, allowing for the sheer of the gunwale), real or imaginary, that as or would have the effect of forming a lid for the skin.
6. Transom
A surface at the aft extremity of the hull.
7. Skin
Continuous outer layer of the hull, which below the waterline, when afloat, is in contact with the water. The skin includes the surfaces above the waterline extending there from to the gunwale.
8. Mast
Integral structure supporting, and/or forming whole or part of the sails, in vertical dimension. For the purposes of the restrictions of Rules 8 and 9, a sail comprised entirely of the mast shall be regarded as a mainsail and mast.
9. Mainsail
The sail aft of the mast
10. Head Sail (Jib)
A sail set with its luff in front of the mast: not permitted to be lowered while racing
11. Spinnaker
Any other sail set during a race.
12. Bowsprits
A bowsprit is a structure extending in front of the stem, which is used to support the tack of the jib and may support the spinnaker pole/bowsprit.
13. Spinnaker Pole
A spinnaker pole is a structure which is used for the purpose of supporting the tack of the spinnaker in a substantially horizontal manner away from the mast. It is measured as a separate hull extension provided that it is not a permanent/unremoveable part of the hull.
14. Hydrofoils
Devices comprising surfaces attached directly or indirectly to the hull; and which are designed to provide hydrodynamic force that will affect the hull while sailing
15. Wings
Wings are any structure, that extend beyond the gunwale in an outward direction, which are attached to the hull, and whose principle purpose is to increase righting moment by moving the crew outward
16. Registration Date
On this date a boat shall have registered.
- Hull (including weighing)
- Sails
- Masts
- Boom
- Spinnaker pole
- Centreboard and rudder
The combined weight of wings tiller extensions, spinnaker pole, whisker wires, trapeze wires, shock cords and control lines shall not be less than 35kgs
17. Measurements
Points of reference:
For the purpose of these rules, and the directions herein, the word vertical shall refer to the direction perpendicular to both the design waterline and the plane of the gunwales. Upward shall refer to the vertical direction away from the waterline and toward the deck.
Outward shall refer to a position extending furthest from the centreline of the hull in a horizontal plane.
18. Fittings
Fittings and other hull attachments that are for the purpose of attaching or supporting fittings, may be excluded from measurement, provided that in the measurers opinion such fittings/attachments do not outwardly flaunt the rules, that they do not affect the skiff hydrodynamically, and that they are functional.
19. New vs. Repair
A sail, mast, hull or any other item mentioned in these rules will be deemed new if more than 25% of its original area, volume or weight is replaced or altered.
Any alterations and/or repairs to any registered item (i.e. sails, masts, etc.) or repairs to the hull must only be done with written permission of the Governing Body, or its approved representative.
20. The International 18ft Skiff Association is the governing body.
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