Definition

1. Noun:
   • A retractable fin keel used on sailboats to prevent drifting to leeward: A "drop keel" is a type of keel that can be raised or lowered through the hull of a sailboat. When lowered, it functions like a standard fin keel to provide lateral resistance against the water, preventing the boat from being pushed sideways (drifting to leeward) by the wind. When raised, it reduces the boat's draft, allowing it to sail in shallower waters.

Usage

• The term "drop keel" is used specifically in the context of sailing and sailboat design. It describes a mechanical component that is actively operated (dropped or raised) by the crew. It is a technical term, most commonly used by sailors, boat builders, and marine engineers.

Examples

• Noun:
  • The small cruising sailboat was equipped with a drop keel, allowing us to explore the shallow coastal lagoons.
  • Before entering the harbor, remember to raise the drop keel to avoid hitting the bottom.

Advanced Usage

• "Centerboard" and "daggerboard": While all three are types of retractable keels, they differ in design and mechanism. A "drop keel" typically refers to a weighted, fin-like structure that pivots or retracts vertically into a trunk. A "centerboard" usually pivots on a pin, and a "daggerboard" lifts vertically without pivoting. In casual usage, these terms are sometimes used interchangeably, but "drop keel" often implies a more substantial, ballasted fin.
  • For this class of boat, a heavy drop keel is preferred over a simple daggerboard for better windward performance.

Variants and Related Words

• Retractable keel (n): A general term for any keel that can be withdrawn into the boat's hull.
• Swing keel (n): A type of retractable keel that pivots upward into a housing, often synonymous with "drop keel."
• Leeboard (n): A pair of wooden or metal plates attached to the sides of a flat-bottomed boat to prevent leeward drift, serving a similar function but with a different design and placement than a drop keel.

Synonyms

• Centerboard (n): A pivoting retractable keel.
• Daggerboard (n): A vertically retracting keel.
• Swing keel (n): Often used interchangeably with "drop keel."

Antonyms

• Fixed keel (n): A keel that is permanently attached to the hull and cannot be retracted.
• Bilge keel (n): A pair of fixed keels on either side of the hull, also not retractable.

Related Phrases

• To drop the keel: The action of lowering the retractable keel into position.
  • We need to drop the keel to sail upwind effectively.
• To raise the keel: The action of retracting the keel back into the hull.
  • Raise the keel; we're approaching the sandbar.

Noun

1. a retractable fin keel used on sailboats to prevent drifting to leeward