HULL (3) Flashcards
it is the watertight enclosure of the ship, which protects the cargo, machinery, and accommodation spaces of the ship from the weather, flooding, and structural damage
HULL
drawn at the point where the bow intersects the waterline
used as the forward reference of the hull
FORWARD PERPENDICULAR
can be the perpendicular drawn through the aft side of the rudderpost or through the center-line of the rudder pintles
is the aft reference line for all hydrostatic calculations
AFT PERPENDICULAR
It is the length between the forward and aft perpendiculars
a very important parameter in all stability calculations, hence calculation of the _____ at various drafts becomes an important step in carrying out stability analyses
LENGTH BETWEEN PERPENDICULAR
The length between the forward-most and aft-most point of the ship’s hull
This length plays a major role in designing the docking and undocking plans of the ship
LENGTH OVERALL
The upward curve formed by the main deck with reference to the level of the deck at the midship
usually given to allow flow of green water from the forward and aft ends to the midship and allow drainage to the bilges
The ______ _____ is usually more than the aft sheer to protect the forward anchoring machinery from the waves
-SHEER
-FORWARD SHEER
The purpose of the _____ ____ is to ensure that a ship has sufficient freeboard (the height from the waterline to the main deck) and thus sufficient reserve buoyancy (volume of ship above the waterline)
is the line where its hull meets the surface of the water
also called Plimsoll mark
a marking indicating the extent to which the weight of a load may safely submerge a ship, by way of a waterline limit
positioned amidships on both sides of a vessel’s hull and indicates the draft of the ship and the legal limit to which a ship may be loaded for specific geographical areas and seasons of the year
LOAD LINE
the deepest permitted draft considering the relatively benign weather conditions in tropical waters and the fact that the vessel floats deeper in freshwater due to lower density than in saltwater
TROPICAL FRESH WATER
the deepest permitted draft in freshwater considering that the vessel floats deeper in freshwater than in saltwater
FRESH WATER
deepest permitted draft in tropical waters considering the benign weather conditions in tropical waters
TROPICS
deepest permitted draft during summer considering benign weather conditions
SUMMER
a beam that curves upwards in the middle
HOGGING
deepest permitted draft during winter considering rougher weather conditions
WINTER
deepest draft permitted considering the rough weather conditions likely to been countered during winter in the North Atlantic
WINTER NORTH ATLANTIC
a beam that curves downwards in the middle
SAGGING
is the ratio of the ship’s underwater volume to the volume of the imaginary rectangle enclosing the underwater portion of the hull
BLOCK COEFFICIENT
is the ratio of the submerged area of the midship section to the enclosing rectangle
MIDSHIP COEFFICIENT
the main structural member and backbone of a ship or boat, running longitudinally along the centre of the bottom of the hull from stem to stern
KEEL
distance from the waterline to the freeboard deck of a fully loaded ship
it is measured amidships at the side of the hull
represents the safety margin showing to what depths a ship maybe loaded under various service conditions—e.g., the type of cargo, the waters to be navigated, and the season of the year
FREEBOARD
is the compartment where the machinery for marine propulsion islocated
generally the largest physical compartment of the machinery space
usually located near the bottom, at the rear or aft end of the vessel, and comprises few compartments
ENGINE ROOM
is the smokestack or chimney on a ship used to expel boiler steam and smoke or engine exhaust
FUNNEL
is the main control center of a vessel, from where the captain and officers are able to man the entire operations of the vessel
generally located in a position with an unrestricted view and immediate access to the essential areas of a ship
NAVIGATION BRIDGE
The forward part of the upper deck of a ship
The crew’s quarters usually in a ship’s bow
FORECASTLE
