bulb keel: meaning, definition, pronunciation and examples
C1+ (Highly technical/specialized)Technical
Quick answer
What does “bulb keel” mean?
A type of boat keel with a torpedo-shaped or teardrop-shaped mass at the bottom, used to lower the vessel's centre of gravity and improve stability.
Audio
Pronunciation
Definition
Meaning and Definition
A type of boat keel with a torpedo-shaped or teardrop-shaped mass at the bottom, used to lower the vessel's centre of gravity and improve stability.
In marine engineering, a structural fin protruding from a boat's hull, characterized by a bulbous weight at its tip, designed to increase righting moment and sailing performance, especially in yachts.
Dialectal Variation
British vs American Usage
Differences
No significant lexical difference. The term is identical in both varieties within nautical technical contexts.
Connotations
Technical term with no distinct regional connotations.
Frequency
Equally rare in general usage, only appearing in sailing, yacht design, and marine engineering contexts.
Grammar
How to Use “bulb keel” in a Sentence
The [noun, e.g., yacht] has a bulb keel.They fitted a bulb keel to the [noun, e.g., hull].Vocabulary
Collocations
Examples
Examples of “bulb keel” in a Sentence
adjective
British English
- The bulb-keel design is favoured for offshore racing.
American English
- The bulb-keel configuration offers superior stability.
Usage
Meaning in Context
Academic
Used in naval architecture and marine engineering papers on hull design and hydrodynamics.
Everyday
Virtually never used in everyday conversation outside of dedicated sailing communities.
Technical
Core term in yacht design, sailing manuals, and boat specifications to describe a specific keel type.
Vocabulary
Synonyms of “bulb keel”
Strong
Neutral
Weak
Vocabulary
Antonyms of “bulb keel”
Watch out
Common Mistakes When Using “bulb keel”
- Mis-spelling as 'bulp keel' or 'bulb keal'.
- Using it as a verb (e.g., 'The boat bulb keels').
- Confusing it with a 'bilge keel', which is a pair of smaller keels on the sides of the hull.
FAQ
Frequently Asked Questions
No, they are different. A bulb keel is a single, central fin with a weight at the bottom. Bilge keels are two smaller fins attached to the sides (bilges) of the hull, often used to allow a boat to sit upright on the seabed.
Typically, no. A bulb keel is a fixed structure. Retractable keels are a different design, sometimes called lifting keels or swing keels.
They are usually constructed from heavy materials like cast iron or lead for the bulb, integrated with a fin made of steel, aluminium, or composite materials like carbon fibre.
They are most commonly found on performance sailing yachts, especially those designed for racing or fast cruising, where stability and reduced draught are important.
A type of boat keel with a torpedo-shaped or teardrop-shaped mass at the bottom, used to lower the vessel's centre of gravity and improve stability.
Bulb keel is usually technical in register.
Bulb keel: in British English it is pronounced /ˈbʌlb ˌkiːl/, and in American English it is pronounced /ˈbʌlb ˌkil/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Imagine a light BULB hanging from the bottom of a boat's KEEL; the bulb is heavy and helps keep the boat upright.
Conceptual Metaphor
STABILITY IS A LOW, WEIGHTED FOUNDATION.
Practice
Quiz
What is the primary purpose of a bulb keel?