Fundamental Rules PART B – Measurement Rules
The Rules PART A – Fundamental Rules 1.1 The Viper 640 is a strict one-design keelboat where the true test, when raced, is between helmspersons and crews, and not boats and equipment 1.2 All Viper 640s shall be produced by Class Association appointed builders, shall comply with Class Association (Class) approved construction plans and specifications and shall be identical in every respect except where the class rules specifically allow for differences. No changes to the boat supplied by the builder are allowed unless they are specifically permitted by the class rules. 1.3 A Viper 640 shall be raced only with foils supplied by a Class appointed builder. 1.4 A Viper 640 shall be raced only with equipment and fittings identical to the fittings supplied with the boat by a Class appointed builder unless: (a) The Class Rules specifically allow equipment and fittings that differ from those supplied by the builder, (b) A boat replaces existing fitting or equipment with the current fittings and equipment used by a current builder, subject to rule 1.7., (c) A boat adds fittings or equipment used by a current builder, subject to rule 1.7. 1.5 The Viper 640 shall only be raced with sails supplied by a Class approved sail maker. 1.6. No addition or alteration may be made to the hull form, construction, equipment, type of equipment, fittings, type of fittings, standing rigging, running rigging, spars and foils as supplied by the builder except when such an alteration or change is specifically authorized by these rules.
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