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F12 CLASS CATAMARAN MEASUREMENT GUIDELINES
Prologue: The Formula 12 class
The Formula 12 catamaran exists with the primary purpose of introducing young, novice and disabled sailors to the thrills of sailing high performance catamarans. With this in mind the following rules endeavor to outline a cost effective, safe and enjoyable class of sailing boat that can also be used for close racing across a range of designs.
The Formula 12 Design Box Rule
1. In case of doubt, the intention of the rule makers, which is referred to as the spirit of the rule, shall take precedence over the letter of the rule. It is the intention of the rule makers to set a reasonably similar drag, relating to a reasonably similar saildrive, resulting in reasonably level performance over many different makes, so as to achieve a fair and effective formula class. For construction, all materials and methods are allowed when these do not imply either an unacceptable risk of bodily harm or the operation of an unseaworthy craft. It is the responsibility of competitors to ensure their craft are safe and seaworthy.
2. A catamaran is defined as a two-hulled sailing boat with essentially duplicate or mirror image hulls, fixed in parallel positions.
3. Sail area shall not be more than: 7.00 square metres. There is no restriction on how sail area is distributed. Sails must be able to be dropped easily in all conditions while on the water or land with mast attached to boat, pocket luff sails may not have sidestays. Where a pocket luff sail is not used, half the mast area shall be included in the total sail area. “The girth measurement shall be taken as the distance from the centreline round the surface of the spar to the same point on the centreline. The resultant dimension shall be divided by two to give the half girth measurement.”
Boom measurement is only included in the sail area if the profile height of the boom is more than 1.5 of the width and shall be taken as per mast measurement.
When undertaking the sail measurement the following points should be noted.
Sail to be measured on a flat surface and laid out in terms of IYRU Measurement & Calculation of Sail Area Instructions. i.e.
“With battens set in their pockets the sail shall be pegged out on a flat surface with just sufficient tension to remove waves or wrinkles from the edge rounds and to spread the sail, as far as possible, substantially flat. Once the sail has been pegged out in this way all the required measurements shall be taken and no alterations to the tensions shall be made.”
4. Mast construction and rigging shall be un-restricted.
A contrasting measurement band shall be located on the mast no higher than 6metres above the top of the front beam. At no time shall any part of the main sail with the exception of a halyard lock or shackle or pocket luff sail cap be located above this measurement band. Unstayed rigs must secure the mast ensuring that during capsize the mast remains attached to the boat.
5. The overall length of the catamaran shall not be more than: 3.80 metres.
The length shall be measured between perpendiculars to the extremities of the hulls with
the catamaran in her normal trim. The measurement shall be taken parallel to the centre
line of the craft and shall exclude rudder hangings, but if the athwartships width of a
rudder within 153mm of the bottom of the hull is more than 76mm, the length shall be taken to the aftermost point of the rudder.
6. The extreme beam width shall not be more than: 2.00 metres
The beam shall be measured at right angles to the centre line of the craft at the widest point and including all fixed or adjustable apparatus, this may be at some point down the sides of the hulls, especially if hulls are angled. It may also be possible that the maximum width is at the bottom of centerboards when fully down.
7. Trapeze is allowed.
8. Each hull shall have at least one inspection hatch.
9. Each hull shall carry at least 30 litres of flotation, which may be provided by solid closed cell foam, solid blocks of compacted foam granulate, air bags or sealed air compartments.
10. The platform shall be equipped with a maximum of two rudders.
11. In addition to the rudders, the platform may also be equipped with one or more daggerboards or centerboards.
12. It is not permitted to adjust the following items while racing: the rake of the mast, the tension of the standing rigging, the angle or length of the spreaders (if fitted).
13. It is the responsibility of the crew to ensure that the boat is equipped with a righting system that will enable the crew to right the boat without any outside assistance.
14. The Formula 12 Class authority may demand that a crew demonstrate their ability to right their boat, but only at a time when doing so does not directly affect the fairness of racing.
15. There will be no other restrictions on crew weight apart from the requirement that the crew weight must be sufficient to right the boat unaided under all encountered sailing conditions.
16. The F12 Division emblem shall be carried on the mainsail over national letters and sail numbers, Sail numbers shall be allotted by the Class Association.
17. Hydrofoils are not permitted. At least one hull shall be in the water while sailing. To this end, centreboards and rudders are to be essentially straight with a maximum camber (top to bottom) of no more than 25mm. They are to be essentially vertical with the distance between the bottom of the boards, when both are deployed, within 100mm of the distance between the top of the boards in the same position.
18. Minimum weight in full sailing trim shall be not less than 50 kilograms. The boat must be weighed in a dry condition and any weights attached to bring the boat to a minimum weight of 50 kilograms must be permanently affixed.
19.1. Voting rights
Voting rights are only available to people that have designed or built a dedicated F12 catamaran. Whilst other designs that come within the rules are most welcome to compete in F12 races they have no voting rights regarding F12 design.
The following people are each entitled to one vote on class matters.
o Designers who have provided a free design of a dedicated F12 for others of which at least one has been built.
o Builders who have built at least one dedicated F12 boat ready to sail.
o Owners of a ready to sail dedicated F12 cat
19.2.a Changing of rules
A change to these rules requires affirmative votes from 2/3 of all people entitled to vote at the time of the poll.
19.2.b Rule changes may not preclude from competition or grandfather currently sailed dedicated F12 catamarans.
19.3. Applicability of rules
These rules exist as a draft only until being ratified or changed by vote after the launch of the 10th dedicated Formula 12 catamaran.
19.4.a. Governing body
Initially the Formula 12 catamaran class shall be run with all those entitled to vote having equal voting rights. Upon the launch and measurement of the 49th vessel the class association may with a 2/3 majority vote choose to implement a governing council which will be empowered to handle the general running of the class.
19.4.b. Where a governing council is adopted they may not make changes to the measurement box rule or voting structure, with out first receiving 2/3 majority support for any changes.
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