Rule 42 of the World Sailing Racing Rules of Sailing relates to "Propulsion".

The Basic Rule (RRS 42.1) states that: "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."

Use the links below to view Common Breaches by Class for the following classes and in several languages:

• 420
• 470
• Elliott 6m
• Finn
• Laser
• Optimist
• Star
• 49er / FX
• 29er
• Europe

The documents below include Interpretations of Rule 42, documents for officials and the Rule 42 Quiz.