1.  Length
Overall length of the hull is not to exceed 5,486m (18ft) or be less than 5,41m (17ft 9in). This is measured between the stem and transom.

2.  Beam
(a) The minimum beam measured between the gunwales at the widest point is not to be less than 1,828m (6ft). Maximum width between outer gunwales is not to be more than 2,44m (8ft).
(b) Maximum overall horizontal width of all extensions, wings, planks or any other appendages (specifically excluding tiller extensions) measured in the most horizontal position is not to exceed 2,135m (7ft) from the centreline.

3.  Hull
Only one hull is permitted and, at or about the point 2,743m (9ft) behind the stem, which shall be vertical, no concave sections are permitted in the skin.

A hull may only be constructed to the International League design by a registered builder from a female mould.
If in the opinion of the governing body an attempt has been made to vary the approved hull design the boat in question will not be approved or registered.

The all up dry weight will be 170 kg and includes the following;
Hull rigged with the number one rig, sails, wings, rudder, fin & all sheets & equipment normally on board when sailing (but excluding spares & non essential items)

A hull may only be constructed from approved materials. Approved materials from which hulls may be constructed are: Carbon Fibre, Nomex, Closed Cell Foam, E-Glass, R-Glass, Aramid, Spectra, Carbon Fibre, Polyester, Vinyl Ester, Epoxy Resin. Resin systems requiring a curing temperature in excess of 90°C are specifically prohibited.

Forward of the stem no part of the hull, including bobstay, bowsprit and spinnaker pole, shall be thicker than 20mm from a distance of 100mm below the sheer line at the stem.

Bowsprits may only extend a max of 750mm from the stem. The Jib position to be a max of 600mm from the stem
With the exception of a wire or rod bobstay for the spinnaker pole, the bobstay may not join the stem any lower than 100mm or higher than 130mm above the keel line.

The bob stay shall be a maximum width of 130mm and be parallel sides.
The Chain Plates shall be a maximum width of 1810mm and positioned on front wing perp.

4.  Depth
The depth of the hull shall be measured 2,743m (9ft) aft of the stem. At this point the vertical depth between the plane of the gunwale and the outside of the skin at the centreline shall not be less than 0,508m (20in).

The depth of the hull shall also be measured within 75mm of the stem. This vertical depth shall not be less than 0,3m (11in).

5.  Sheerline
There shall be no convex sheer in the gunwale line. The transom may not be exceed a fore and aft slop of 45 degrees.

6.  Wings
Wings must be Registered and constructed and attached to the hull in such a way that they are not capable of adding additional righting moment, from whatever sources, beyond their own weight, and the weight of the crew they support.

Wings must be constructed from up to and including 6000 series aluminium and be constructed from substantially circular/round tubing.

Wing joints may be constructed from any material

7.  Decking and Buoyancy
Placement of the buoyancy is optional. There shall be a cockpit between the chain plates and transom of depth not less than 200mm measured along the centreline and perpendicular to the plane across the sheerline.

The foredeck must be convex for a distance 2000mm min aft of the stem.

8.  Sails
Each boat shall only race with registered sails. Registered sails shall be indelibly numbered and recorded on their registration certificate. Each boat may have the following max. registered sails for any 12 month period.

• 2 Mainsails
• 2 Jibs
• 2 Spinnakers

A boat attending a championship event in another hemisphere from its normal home continent shall be allowed to replace 2 sails.

One set of reefpoints will be permitted in the smallest mainsail.

Mainsails, Headsails (Jibs) and Spinnakers may only be constructed from approved materials. Approved materials from which Mainsails and Headsails (Jibs) may be constructed are: Mylar, Dacron, Aramid, and Spectra. A minimum weight of 154 grams per square metre applies to all approved materials.

Approved materials from which Spinnakers may be constructed are: HTS, 30-30, Trilite, Dynalite, and 0.9oz Silicone Coated Polyester. A minimum weight of 38 grams per square meter applies to all approved material.

9.  Masts
At registration day each boat shall have indelibly numbered and recorded the masts in use at that time.

No 1 Mast may be constructed from Carbon Fibre. No. 2 Mast may only be constructed from up to and including 6000 Series aluminium, however, the top 40 percent of the mast by length may be constructed from G.R.P and carbon fibre.

(1) Each boat may have a maximum of two (2) masts.
Each mast will be of fixed length and each mast will have a maximum height, which will be measured from the sheerline at the mast step:

• No. 1 10,225m (33ft 7in)
• No. 2 9,200m (30ft 2in)

Alternately
(2) Each boat may have 1 mast adjustable to two height positions as above of which only the top 40% may be carbon fibre.

10.  Booms
Booms and must be constructed from up to and including 6000 Series Aluminium or GRP / Carbon fibre.
A maximum of one (1) Boom shall be allowed.

11.  Spinnaker Poles
Spinnaker Poles may be constructed from carbon fibre, up to and including 6000 series aluminium, GRP and composite materials

Only one (1) spinnaker pole shall be allowed.

Any pole has a maximum length of 3.8m (12ft 5in) from the stem.

12.  Crew
There will be a minimum crew of three. The minimum age of any crew member will be 14 years.

13.  Hydrofoils
There shall be no hydrofoils allowed except for the hull, centre board and rudder

14.  Centreboards & Rudders
A maximum of one (1) centreboard and one (1) rudder may be used at any one time.

No foil(s) may extend more than 1.6m (5ft 3in) below the keel.

Centreboards and rudders may only be constructed from approved materials. Approved materials from which Centreboards and Rudders may be constructed are: Closed Cell Foam, E-Glass, S-Glass, R-Glass, Aramid, Spectra, Carbon Fibre, Polyester, Vinyl Ester, Epoxy Resin. Resin systems requiring a curing temperature in excess of 90°C are specifically prohibited.

15.  Rigging, Fittings
Titanium, or similar materials, are not permitted in rigging, fittings or fastenings. Rigging wires supporting mast and spinnaker pole will only be made from Stainless Steel.

16.  Rule Exemptions
All boats measured and competing in officially sanctioned events prior to 1st August 1997 will be subject to all rules described herein, EXCEPT that existing hull designs and equipment materials will be permitted to be used until such time as their replacement/alteration. Such replacement/alteration must conform to the current rules.

17.  Rules Compliance
It is the skippers and owners responsibility to ensure that their skiff complies with the rules at all times.

The Governing Body or its approved representative acting on behalf of the Governing Body, is responsible to ensure compliance with these rules.

Skipper/owner must make the skiff available for scrutineering at the request of the Governing Body or its approved representative.

18.  Alterations & Exceptions to the 1997-2000 ISAF Rules
Alterations & Exceptions to the 1997-2000 ISAF Racing Rules of Sailing and corresponding National Rules
a.        Rule 51 (Moving Ballast) is not applicable.
b.        Rule 54 (forestay and headsail tacks) is not applicable.
c.        Appendix J. The maximum weight of clothing and equipment is 10kg per person