Catamarans

Tenslotte heb je nog een rating voor catamarans, de Texel rating. Hierdoor kunnen verschillende type catamarans tegen elkaar racen. Een Dart 16 is een langzamere boot als de Nacra F18, daarom krijgt deze een hogere rating waardoor je met deze boot lager kan eindigen.

Onderstaande tekst is tijdelijk in het Engels. Dit wordt binnenkort vertaald.

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Texel Rating Rule
Real winners in any racing can be found only, by sailing one-design classes, like Dart and Hobie catamarans. Or by racing restricted classes, like Formula 18 and Tornado.
But as there is a demand for handicap racing with a variety of designs, a handicapping system has to be developed.
Before 1984, a yardstick system like the Portsmouth Yardstick was used. The Texel Rating system started in 1985. This is a measurement system, not a yardstick.
The basic power formula explains more than 90 % of the performance of the small open catamarans, the so-called beach catamarans of up to 6.70 m. (22 ft), as well as of all sailing cabin multihulls (catamarans and trimarans) of any length.

It is easy to change this simple type of formula, if observations of the performance, read racing results, require it. There have been updates in the power formula in 1993 and 2002. In 2005 there are additions to the rule, not to the basic formula, about spinnakers and about rating numbers, available now for higher wind speeds.

The TR formula is meant for optimal designs, with dagger boards or centreboards.
The philosophy behind this is that designers have to be free to construct boats in the best way they can, not influenced by any rating formula. So in the TR system an allowance has been included, for not optimal designs, without dagger boards or centreboards. To compensate beach catamarans with no keels or shallow ones, 3 % is added to their calculated rating numbers. For cabin multihulls a special formula gives a variable correction factor.

To calculate a rating number, three elements, rated length (RL), rated sail area (RSA) and rated weight (RW) have to be determined. The measuring of the length, the real sail areas of the mainsail, jib and/or spinnaker as well as the weighing of the boats is done by official measurers. Crew weight is added, depending on the length.

If there are class rules, which give enough information about the data required, the dimensions given in the class rules are used as input. If the class rules do not give enough information, three of more boats have to be measured. The TR number then is calculated, using the largest sail areas and the lowest boat weight. If less than three or one boat only is available for measurement, the design is considered to be an one-off, marked as such in the rating lists.
Generally it is the task of the class organizations to check the boats belonging to a class, on conformity with the class rules.

The Texel Rating Rule with its formulas is more and more used abroad. Because of that fact the language chosen for this text and others is English.

More information about the Texel rating:

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