Oakum, Oar, Oarlock, Occluded front, Occulting, Ocean, Off, Officer, Offing, Offset, Offshore, Off the wind, Oilskins, Old man, Old salt, Onshore, On the wind, OOW, Order, Ordnance, Orient, Orientate, Orlop, Orrery, Oselver, Outboard, Outboard engine, Outdrive, Outfit, Outhaul, Outrigger, Outward, Over a barrel, Overboard, Overcast, Overfall, Overhead, Overhaul, Overtake
“Oakum is a preparation of tarred fiber used in shipbuilding, for caulking or packing the joints of timbers in wooden vessels and the deck planking of iron and steel ships, as well as cast iron pipe plumbing applications. Oakum was at one time recycled from old tarry ropes and cordage, which were painstakingly unraveled and taken apart into fiber; this task of picking and preparation was a common penal occupation in prisons and workhouses.
In modern times, the fibrous material used in oakum is derived from virgin hemp or jute. The fibers are impregnated with tar or a tar-like substance, traditionally pine tar (also called 'Stockholm tar'), an amber-colored pitch made from pine sap. Petroleum byproducts can be utilized for a tar-like substance that can also be used for modern oakum. White oakum is made from untarred material.”
A long thin, often wooden, device with a handhold (grip) at one end and a flat, or shaped, blade at the other. They are used in pairs, extending from the sides of a small boat, to propel the boat through the water. The loom, between the handhold and the blade, is held to the boat in a crutch or rowlock.
On this synoptic chart of the North Atlantic there is a deep depression to the SE of Greenland which has three frontal systems: The occlusions are blue lines with semicircles and triangles.
Cold fronts (blue lines with blue triangles) usually move around depressions faster than warm fronts (red lines with red semicircles), and so overtake them. Being more dense, the colder air moves under the warmer air and displaces it upward: the warm front and the cold front are then in roughly the same geographic location, with the warm front at higher altitude.
Oc G (2) 10s means a green light (and therefore a SHM in IALA-A, a PHM in IALA-B) which is mostly on but occults (goes out) twice every 10 seconds.
A large body of saline water not surrounded by land.
Some distance from the land. Typically, a ship is in the offing when it can be seen from the shore. The skipper of a boat on a lee shore would be anxious to 'make an offing': to get further from the land.
A person who has a position of authority in an hierarchical organization such as a navy. An officer receives his or her commission from the Sovereign or head of state.
The term is used differently in different countries:
An offset is a number in a table of offsets which describes the distance of a point from a reference line such as a centreline or waterline or baseline. In the diagram the table of offsets gives the same information as the line drawings: both describe the shape and dimensions of the Rushton catboat.
© Copyright Marc Bauer
Off the wind
The wind is aft of the beam.
"Oilies", "foulies". A suit of waterproof clothing worn by sailors. The original oilskins were oiled skins of, e.g., seals. These were replaced by oiled, or tarred, tarpaulin (canvas) and now (early C21) by complex, petroleum derived fabrics.
Slang for an experienced sailor.
On the wind
The wind is forward of the beam.
n An instruction, given by a more senior person in the armed forces, which must be carried out.
n A tidy arrangement of ideas or materials which thereby are readily accessible.
A general name for every kind of artillery used in war.
An ordinance is 'an authoritative order or instruction', as might be issued by a religious order.
The countries to the East.
To align with.
To point in the correct direction.
A mechanical device, with spheres to represent the sun and planets, to show the movements of the heavenly bodies.
Originally, a planetarium. Modern-day planetaria use instruments which project narrow beams of light onto the inside of an hemispherical dome representing the sky.
Outboard engine (or motor)
A propulsion device which incorporates an engine, gearbox, shaft and propeller in one portable or transportable unit, and which is designed to be clamped to the transom of a boat and which can, theoretically, be removed or reinstated at will. Typically, the engine itself is located high, at the level of the top of the transom. The drive (propeller) shaft is vertical to a gearbox and propeller under water, below the level of the transom. The whole device can be tilted to bring the propeller clear of the water. The boat is steered by rotating the entire outboard unit on its vertical axis, rarely with a separate rudder.
Small outboard engines (up to about 5 horsepower) conveniently turn a small sailing or rowing dinghy into a powered craft. This is useful for moving the boat into and out of a harbour or marina, and for getting home when the wind fails. At other times the engine can be removed from the transom and stowed aboard the dinghy or taken home for safe keeping and/or repair.
Larger outboard engines tend to have throttle and steering controls linked to wheels and levers within the boat; they may be bolted to the transom rather than clamped: removal of the engine is more complex and time consuming and such motors tend to be left in place. Outboard engines may be installed in a well within the boat.
A large outboard engine has the single advantage over an inboard engine in that there is no need for watertight through-hull fittings for the propeller shaft,
Outboard engines may be fuelled with gas, or petrol, or petroil or electric batteries; rarely with diesel oil. The fuel tank may be mounted above the engine or it may be located remotely within the boat.
The motor of an electric outboard is mounted underwater, closely attached to the propeller
The 25 horsepower petrol outboard motor is bolted to the stern of FoolHardyToo. The steering and throttle controls are routed to the wheelhouse. The fuel tank is in the cockpit, remote from the motor.
For all practical purposes 'engine' and 'motor' are synonymous.
Wordnet suggests that a motor converts energy into motion; an engine converts thermal energy into motion.
Stackexchange is clear that motors run on electricity while engines run on combustion, whether internal or external.
Wikipedia says that "an engine or motor is a machine designed to convert one [?any] form of energy into mechanical energy."
The Latin 'ingenium' meant 'talent, device', and used the same root as 'ingenious'. Hence an 'engine' is a product of ingenuity; a tool or a weapon; later a large mechanical weapon (like a trebouchet). The word was then used for 'steam engines' and 'internal combustion engines'.
The Latin 'movere' meant 'to move' and became the late Middle English 'motor'; a person who imparts movement. In the 1660s it became an "agent . that produces mechanical motion". In the mid 19th century it came to mean a device which imparts movement.
One might say that an engine converts energy into movement while a motor makes things move.
Generally refers to a persons suit of clothes.
Out of the port or the country.
A vessel 'outward bound' is leaving the country bound for foreign parts.
Over a barrel
You have someone "over a barrel" if they must do your bidding without choice.
A series of standing waves which might break in unpredictable directions.
The flat surface above people's heads in a confined space below decks. The underside of the deck above.
v Moving lines through a block by hand when there insufficient wind to pull them through. In very light winds the friction in the mainsheet blocks may prevent the boom from moving out abeam; the sheet may then be overhauled by manually pulling the lines through the blocks.
IRPCS Rule 13 "Overtaking" says
"(a) . . . any vessel overtaking any other shall keep out of the way of the vessel being overtaken.
(b) A vessel shall be deemed to be overtaking when coming up with another from a direction more than 22.5 degrees abaft her beam, that is, she would be able to see only the stern light of that vessel . . ."
If you disagree,
or can't find a word
please let me know.