Part 4
Part 4 rules apply only to boats racing unless the rule states otherwise.
When flag Y is displayed with one sound before or with the warning signal, competitors shall wear personal flotation devices, except briefly while changing or adjusting clothing or personal equipment. When flag Y is displayed ashore, this rule applies at all times while afloat. Wet suits and dry suits are not personal flotation devices.
A boat shall not receive help from any outside source, except
  1. help for a crew member who is ill, injured or in danger;
  2. after a collision, help from the crew of the other vessel to get clear;
  3. help in the form of information freely available to all boats;
  4. unsolicited information from a disinterested source, which may be another boat in the same race.
However, a boat that gains a significant advantage in the race from help received under rule 41(a) may be protested and penalized; any penalty may be less than disqualification.
42.1. Basic Rule
Except when permitted in rule 42.3 or 45, a boat shall compete by using only the wind and water to increase, maintain or decrease her speed. Her crew may adjust the trim of sails and hull, and perform other acts of seamanship, but shall not otherwise move their bodies to propel the boat.
42.2. Prohibited Actions
Without limiting the application of rule 42.1, these actions are prohibited:
  1. pumping: repeated fanning of any sail either by pulling in and releasing the sail or by vertical or athwartship body movement;
  2. rocking: repeated rolling of the boat, induced by
    1. body movement,
    2. repeated adjustment of the sails or centreboard, or
    3. steering;
  3. ooching: sudden forward body movement, stopped abruptly;
  4. sculling: repeated movement of the helm that is either forceful or that propels the boat forward or prevents her from moving astern;
  5. repeated tacks or gybes unrelated to changes in the wind or to tactical considerations.
42.3. Exceptions
  1. A boat may be rolled to facilitate steering.
  2. A boat’s crew may move their bodies to exaggerate the rolling that facilitates steering the boat through a tack or a gybe, provided that, just after the tack or gybe is completed, the boat’s speed is not greater than it would have been in the absence of the tack or gybe.
  3. Except on a beat to windward, when surfing (rapidly accelerating down the front of a wave) or planing is possible, the boat’s crew may pull in any sail in order to initiate surfing or planing, but each sail may be pulled in only once for each wave or gust of wind.
  4. When a boat is above a close-hauled course and either stationary or moving slowly, she may scull to turn to a closehauled course.
  5. If a batten is inverted, the boat’s crew may pump the sail until the batten is no longer inverted. This action is not permitted if it clearly propels the boat.
  6. A boat may reduce speed by repeatedly moving her helm.
  7. Any means of propulsion may be used to help a person or another vessel in danger.
  8. To get clear after grounding or colliding with a vessel or object, a boat may use force applied by her crew or the crew of the other vessel and any equipment other than a propulsion engine. However, the use of an engine may be permitted by rule 42.3(i).
  9. Sailing instructions may, in stated circumstances, permit propulsion using an engine or any other method, provided the boat does not gain a significant advantage in the race.
Note; Interpretations of rule 42 are available at the World Sailing website or by mail upon request
  1. Competitors shall not wear or carry clothing or equipment for the purpose of increasing their weight.
  2. Furthermore, a competitor’s clothing and equipment shall not weigh more than 8 kilograms, excluding a hiking or trapeze harness and clothing (including footwear) worn only below the knee. Class rules or sailing instructions may specify a lower weight or a higher weight up to 10 kilograms. Class rules may include footwear and other clothing worn below the knee within that weight. A hiking or trapeze harness shall have positive buoyancy and shall not weigh more than 2 kilograms, except that class rules may specify a higher weight up to 4 kilograms. Weights shall be determined as required by Appendix H.
Rule 43.1(b) does not apply to boats required to be equipped with lifelines.
44.1. Taking a Penalty
A boat may take a Two-Turns Penalty when she may have broken one or more rules of Part 2 in an incident while racing. She may take a One-Turn Penalty when she may have broken rule 31. Alternatively, sailing instructions may specify the use of the Scoring Penalty or some other penalty, in which case the specified penalty shall replace the One-Turn and the Two-Turns Penalty. However, 
  1. when a boat may have broken a rule of Part 2 and rule 31 in the same incident she need not take the penalty for breaking rule 31;
  2. if the boat caused injury or serious damage or, despite taking a penalty, gained a significant advantage in the race or series by her breach her penalty shall be to retire.
44.2. One-Turn and Two-Turns Penalties
After getting well clear of other boats as soon after the incident as possible, a boat takes a One-Turn or Two-Turns Penalty by promptly making the required number of turns in the same direction, each turn including one tack and one gybe. When a boat takes the penalty at or near the finishing line, she shall sail completely to the course side of the line before finishing
44.3. Scoring Penalty
  1. A boat takes a Scoring Penalty by displaying a yellow flag at the first reasonable opportunity after the incident.
  2. When a boat has taken a Scoring Penalty, she shall keep the yellow flag displayed until finishing and call the race committee’s attention to it at the finishing line. At that time she shall also inform the race committee of the identity of the other boat involved in the incident. If this is impracticable, she shall do so at the first reasonable opportunity and within the time limit for protests.
  3. The race score for a boat that takes a Scoring Penalty shall be the score she would have received without that penalty, made worse by the number of places stated in the sailing instructions. When the sailing instructions do not state the number of places, the penalty shall be 20% of the score for Did Not Finish, rounded to the nearest whole number (0.5 rounded upward). The scores of other boats shall not be changed; therefore, two boats may receive the same score. However, the penalty shall not cause the boat’s score to be worse than the score for Did Not Finish.
A boat shall be afloat and off moorings at her preparatory signal. Thereafter, she shall not be hauled out or made fast except to bail out, reef sails or make repairs. She may anchor or the crew may stand on the bottom. She shall recover the anchor before continuing in the race unless she is unable to do so.
A boat shall have on board a person in charge designated by the member or organization that entered the boat. See rule 75
A boat shall use only the equipment on board at her preparatory signal.
No person on board shall intentionally leave, except when ill or injured, or to help a person or vessel in danger, or to swim. A person leaving the boat by accident or to swim shall be back on board before the boat continues in the race.
When safety requires, a boat shall sound fog signals and show lights as required by the International Regulations for Preventing Collisions at Sea (IRPCAS) or applicable government rules.
A boat shall comply with rule 10, Traffic Separation Schemes, of the IRPCAS.
Competitors shall use no device designed to position their bodies outboard, other than hiking straps and stiffeners worn under the thighs.

When lifelines are required by the class rules or any other rule, competitors shall not position any part of their torsos outside them, except briefly to perform a necessary task. On boats equipped with upper and lower lifelines, a competitor sitting on the deck facing outboard with his waist inside the lower lifeline may have the upper part of his body outside the upper lifeline. Unless a class rule or any other rule specifies a maximum deflection, lifelines shall be taut. If the class rules do not specify the material or minimum diameter of lifelines, they shall comply with the corresponding specifications in the World Sailing Offshore Special Regulations.
Note: Those regulations are available at the World Sailing website.
50.1. Changing Sails
When headsails or spinnakers are being changed, a replacing sail may be fully set and trimmed before the replaced sail is lowered. However, only one mainsail and, except when changing, only one spinnaker shall be carried set at a time.
50.2. Spinnaker Poles; Whisker Poles
Only one spinnaker pole or whisker pole shall be used at a time except when gybing. When in use, it shall be attached to the foremost mast.
50.3. Use of Outriggers
  1. No sail shall be sheeted over or through an outrigger, except as permitted in rule 50.3(b) or 50.3(c). An outrigger is any fitting or other device so placed that it could exert outward pressure on a sheet or sail at a point from which, with the boat upright, a vertical line would fall outside the hull or deck. For the purpose of this rule, bulwarks, rails and rubbing strakes are not part of the hull or deck and the following are not outriggers: a bowsprit used to secure the tack of a sail, a bumkin used to sheet the boom of a sail, or a boom of a boomed headsail that requires no adjustment when tacking.
  2. Any sail may be sheeted to or led above a boom that is regularly used for a sail and is permanently attached to the mast from which the head of the sail is set.
  3. A headsail may be sheeted or attached at its clew to a spinnaker pole or whisker pole, provided that a spinnaker is not set.

50.4. Headsails
For the purposes of rules 50 and 54 and Appendix G, the difference between a headsail and a spinnaker is that the width of a headsail, measured between the midpoints of its luff and leech, is less than 75% of the length of its foot. A sail tacked down behind the foremost mast is not a headsail.
All movable ballast, including sails that are not set, shall be properly stowed. Water, dead weight or ballast shall not be moved for the purpose of changing trim or stability. Floorboards, bulkheads, doors, stairs and water tanks shall be left in place and all cabin fixtures kept on board. However, bilge water may be bailed out. 

A boat’s standing rigging, running rigging, spars and movable hull appendages shall be adjusted and operated only by the power provided by the crew.
A boat shall not eject or release a substance, such as a polymer, or have specially textured surfaces that could improve the character of the flow of water inside the boundary layer.
Forestays and headsail tacks, except those of spinnaker staysails when the boat is not close-hauled, shall be attached approximately on a boat’s centreline.
A competitor shall not intentionally put trash in the water. This rule applies at all times while afloat. The penalty for a breach of this rule may be less than disqualification.

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