Slipstream. Current of water projected on rudder by propeller action.
Slipway. One of the inclined longitudinal timbers supporting a vessel on a building or repairing slip. Inclination varies between one in 12 to one in 24, according to size of vessel it is designed to take.
Sloop. One-masted sailing vessel having fore and aft rig, bowsprit, and jib stay. Name is often given to any such vessel having a single-head sail. 2. Small vessel, mechanically-propelled and used for patrol, escort, and other duties in time of war, formerly ship-rigged. Slop Chest. Chest, or compartment, in which is stowed clothing for issue to crew.
Slop Room. Compartment in which clothing for issue to crew is stowed.
Slops. Clothing that is slipped on. Formerly, name was given to all clothing carried for issue to crew.
Slop Tank. Tank in an oil-tanker used to receive the washings from other tanks when these are being cleaned, the contents of the slop tank later being discharged ashore.
Sludge. Collection, on surface of water, of ice crystals that are not welded together. Does not prevent navigation. Name is sometimes given to 'Brash'. 2. Mud brought up by a dredger. Slug. Slugg. Seventeenth-century term for a slow-sailing vessel.
Sluice. Valve, in form of a door, that moves perpendicularly to the direction of the flow it controls. Found in bilges, tanks, and flooding openings of dry docks.
Slush. Sludge ice. 2. Fat skimmed off galley coppers when boiling meat. Formerly used for lubricating and preservative purposes.