"Slam Dunk" Situation A |
"Slam Dunk" Situation B |
Race Rules: The Slam Dunk
Note: This series covers rules applying to some of the more common racing situations. Recent changes in the rules are often emphasized.
The "Slam Dunk" is an aggressive move where a boat on starboard tacks on top of a port tack boat just after crossing close ahead of her.
Although the rules have not changed with regard to a slam dunk situation, there is often confusion about the rights and obligations of boats involved in this maneuver, so we are giving it some attention.
Here are two situations - both "Slam Dunks" and very similar - but with an important difference.
In the diagram for Situation A, the Blue Boat is already overlapped to leeward as the Red Boat completes its tack to a close hauled course. In the diagram for Situation B, the Green Boat has already completed her tack and is on a close hauled course as the Yellow Boat acquires an overlap to leeward.
In Situation A, the Blue Boat became overlapped to leeward while the Red Boat was tacking. Note the last sentence in Rule 17 which turns off Rule 17 in this case. Here, the Red Boat is in great danger because Blue is entitled to sail above her proper course and can attack Red.
In Situation B, the Yellow Boat became overlapped to leeward after the Green Boat completed her tack. In this case, Rule 17 does apply and Yellow is not entitled to sail above her proper course.
In Situation A, even though Blue can sail above her proper course, she must take care to give Red time and opportunity to take avoiding action in a seamanlike manner.
Rule 17 - On the Same Tack; Proper Course
If a boat clear astern becomes overlapped within two of her hull lengths to leeward of a boat on the same tack, she shall not sail above her proper course while they remain on the same tack and overlapped within that distance, unless in doing so she promptly sails astern of the bother boat. This rule does not apply if the overlap begins while the windward boat is required by Rule 13 to keep clear. |
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