Ship Terminology - Page 3

rjwood_uk · 23-04-2006

i think this should be made sticky...what you think john??

**Bunkerbarge** · 24-04-2006

J

Jack Staff: The flag staff fitted at the bow.
Jack Stay: Tensioned ropes or wires to support such items as davits or masts.
Jack: Lifting device with high mechanical advantage either from a screw lifting device or hydraulic piston.
Jacobs Ladder: Rope ladder hanging over a vessels side. Used for embarking or disembarking while the vessel is at anchor or for use by pilots joining or leaving the ship.
Jetsam: Goods or items that have been discarded overboard whilst at sea. Although traditionally common this practice is now strictly controlled by internationally agreed legislation.
Jib: A projecting arm of either a crane or a derrick.
Joggle Plate: A hull plate that is shaped to enable it’s longitudinal edge to overlap the adjacent plate.
Joggle Shackle: A cable shackle with a quick release pin used in anchoring to haul on one cable when mooring with two anchors.
Jumper Stay: A rope or wire fitted horizontally from one mast to another or any other fixed point.

squiffythewombat · 25-04-2006

Quote:

Originally Posted by Bunkerbarge

J

Jib: A projecting arm of either a crane or a derrick.

Isnt this also the forward sheet on sailing vessles or am i totally off the mark here?

(richard i agree, great reading and should be sticky as its invalubale)

**Bunkerbarge** · 25-04-2006

Hi Squiffy,

I am going to stick my neck on the line here and get shot to pieces but I think the sailing "Jib" is so called because it is supported by a jib, similarly named because of the mast but the sail itself is called the "Jib Sheet".

OK guys feel free to jump in......

tigertc · 25-04-2006

I thought Jib was a chat up line used by sailors...
like...erm...... "I like the cut of your jib...saucy boy!

**Bunkerbarge** · 25-04-2006

There you have the advantage of me Terry.

I have never had the need to use such phraseology but you have obviously come across it before......? maybe in one of the bars you wear the sequined dress.....?

squiffythewombat · 25-04-2006

Quote:

Originally Posted by Bunkerbarge

There you have the advantage of me Terry.

I have never had the need to use such phraseology but you have obviously come across it before......? maybe in one of the bars you wear the sequined dress.....?

LOL! Sounds right to me, ive always called them jibs, and normally the jib is held to the mast via a rope from the mask to the bow and then secure with a rope/cleet arrangement forward?

**Bunkerbarge** · 25-04-2006

I think so, Jib Sail, Jib's'le, Jib Sheet all refer to the same.

**Bunkerbarge** · 28-04-2006

K

Kedge Anchor: One or more anchors carried in addition to the main forward anchors, usually stowed aft. Can be carried by an anchor handling vessel and then used to winch a vessel off from aground or to hold a vessel against a tide.
Keel Blocks: Heavy blocks made of wood and concrete that a vessel sits on in dry dock.
Keel Plate: The center strake of bottom plating.
Keel: The main structural longitudinal member running the length of the vessels bottom.
Keelson: A longitudinal girder on each side of the centerline.
Kent Ledge: Permanent ballast usually of iron. Can be found in the flat bottom of vessels to improve stability.
King Post: A vertical post fitted to support a derrick. Also referred to as a Samson Post.
Kitchen Rudder: A means of directing flow over a propeller to give ahead or astern thrust. Two curved plates form a shroud around the rudder which can be rotated to be either parallel to the propeller, allowing forward thrust or closing around the back of the propeller to redirect the thrust into an astern direction. Works exactly the same as the devices fitted to some modern jets to redirect thrust forwards for braking after landing.
Knee: A structural component fashioned into a right angle to provide strength and support at a joint such as a deck beam to a side frame specifically known as a Beam Knee.
Knuckle: Is generally regarded as a sudden change in the direction of hull plating.
Kort Nozzle: A shroud surrounding a propeller, which has the effect of reducing slip in the water flow and greatly improves propeller efficiency. Found in such vessels as tugs where the slip is considerable when under tow.

**Bunkerbarge** · 05-05-2006

L

Labouring: The action of a vessel slowly pitching and rolling in bad weather and making little headway on course.
Lashings: All wires, ropes and chains used to secure cargo’s. Nothing to do with gravy.
Leading Block: A type of rope block used to guide and change direction of a rope usually into a Capstan.
League: Nautical measure (As in 20,000 of them!), which equals 1/20th a degree of latitude or three miles.
Lee: The sheltered side of an object which can refer to either a vessel, building or a land mass.
Leeward: On the sheltered side of a vessel.
Length Between Perpendiculars, LBP: The distance along the Summer Load Line between the forward and aft perpendiculars. The forward one is at the point where the stem cuts the waterline and the aft one is where the aft side of the rudder post or rudder stock cuts the same. Often referred to as a ships length.
Length Overall, LOA: The total length of the vessel including any extremities. There can be a significant difference in LBP and LOA on sailing vessels.
Light Displacement: The weight of the unladen vessel, measured in tonnes. The difference between the Loaded Displacement and the Light Displacement is the Deadweight.
Lightening Hole: A hole cut into any form of plate that is designed to reduce weight without sacrificing strength.
Lighter: A flat bottomed, unpowered craft for the transport of goods and cargo to and from a vessel.
Lignum Vitae: One of the very few woods that is actually denser than water. This wood was traditionally used as a stern tube and stern frame bearing material in old water lubricated bearings. This was superseded by the advent of oil filled stern tubes with stern seals but, strangely enough, the circle has turned and vessels are now using a plastic bearing material and returning to water cooled and lubricated bearings.
Load Line: A number of lines painted on the side of the vessel at the midship section which indicate the minimum allowed freeboard in a number of conditions and world wide locations. Also known as the Plimsol line and incorporates lines for the following:
Summer Load Line
Winter Load Line
Winter North Atlantic Load Line
Fresh Water Load Line
Tropical Fresh Water Load Line
Loaded Displacement: The weight in Tonnes of a vessels hull, machinery , spares, cargo, fuel, water and crew when a ship is immersed to its Summer load line.
Locking Pintle: A Rudder pintle specifically designed with a restraining collar to prevent the rudder from displacement in, for instance, heavy seas.
Loll: Also known as the Angle of Loll occurs if the centre of gravity is allowed to become above the centre of buoyancy. The vessel will “Loll” over until the centre of gravity is in line with the centre of buoyancy. If, by design, or cargo loading this cannot happen the vessel will simply capsize. Particularly significant with such things as a ships crane when the centre of gravity will instantly move upwards when a weight is lifted from a hold. The centre of gravity of the mass will shift from the bottom of the hold to the tip of the jib in the time it takes the crane to take the weight of the load.
Longitudinal Bulkhead: A bulkhead that runs from forward to aft as opposed to transversely which is across the vessel.
Luff: Opposite to Lee so it is the windward side of a vessel, building or land mass.
Luffing: Is the vertical movement of the jib of a crane, hence a “Luffing” crane is one whose jib can be moved vertically, as opposed to a “Chuffing” crane which is one that won’t move at all!!