week 5 (bow and stern) Flashcards
Is the forward part of a ship’s hull, designed to cut through the water as a vessel moves forward.
Being the most forward point of a ship when it is underway, the bow plays a crucial role in reducing resistance and ensuring smooth navigation
Bow
A protruding bulb at the waterline or just below it at the front of the bow.
Purpose: Reduces drag by altering the water flow around the hull, leading to better fuel efficiency and improved speed.
Used by: Large cargo ships, tankers, and cruise ships
Bulbous bow
A bow design where the top projects forward more than the lower part, creating a reverse sloping shape.
Purpose: Reduces wave-making resistance and improves seakeeping, particularly in large waves.
Used by: Modern naval vessels, offshore supply vessels, and some innovative cargo ships.
Inverted bow, also known as the x- bow.
A bow that slopes backward from the waterline toward the deck, giving a streamlined appearance.
Purpose: Reduces wave impact, improving seakeeping and reducing spray over the bow.
Used by: Modern naval ships, cargo vessels, and fast ferries.
Raked bow
A vertical or nearly vertical bow that runs straight up and down from the waterline to the deck.
Purpose: Maximizes waterline length, improving hull speed and reducing wave resistance.
Used by: Traditional sailing ships, early warships, and some modern racing yachts.
Plumb bows
A bow with a pronounced curve, resembling a spoon, with a rounded profile above the waterline.
Purpose: Provides smooth entry into waves, improving seakeeping and reducing pitching.
Used by: Passenger ships, ferries, and some luxury yachts.
Spoon bow
A sharply angled, straight-edged bow that cuts through waves like an axe blade.
Purpose: Reduces wave impact and slamming, enhancing performance in rough seas.
Used by: High-speed vessels, offshore patrol vessels, and some advanced naval ships
Axe Bow
A sharp, forward-projecting bow with a backward slope and often an upward curve, resembling the bow of 19th-century clipper ships.
Purpose: Reduces wave resistance and enhances speed, particularly in strong headwinds.
Used by: Traditional sailing ships ( and some vintage-style yachts.
Clipper Bow
Bows with either parabolic (curved) or cylindrical (rounded) shapes that are smooth and rounded
Purpose: Provides balanced hydrodynamic performance, reducing resistance and improving stability.
Used by: Various modern commercial vessels, including some bulk carriers and tankers.
Parabolic and Cylindrical Bow
refers to the rear or aft-most part of the vessel. It plays a crucial role in a ship’s stability, maneuverability, and overall hydrodynamics.
Different stern designs are used depending on the vessel’s purpose, speed requirements, and sea conditions it is expected to encounter
Stern of a ship
A flat, vertical, or near-vertical stern that cuts off sharply, creating a rectangular shape.
Purpose: Increases deck space and simplifies construction, often used to mount outboard motors or swim platforms.
Used by: Modern powerboats, ferries, and some commercial vessels.
Transom Stern
A curved or sloped stern that tapers smoothly down to the waterline, with an extended overhang.
Purpose: Improves seakeeping and reduces wake, providing a more comfortable ride in rough seas.
Used by: Ocean-going cargo ships, naval vessels, and some passenger ships.
Cruiser Stern
An elegantly curved stern that forms a rounded or elliptical shape.
Purpose: Provides aesthetic appeal and smooth flow of water around the stern, reducing turbulence.
Used by: Classic sailing yachts, luxury yachts, and traditional passenger liners.
Elliptical Stern
