Propeller Wheel or screw mechanism that
pushes water aft to propel the boat.
Rigging The general term for all lines (ropes)
of a vessel.
Roll The sideward motion of a boat caused
by wind or waves.
Rules of the Road The nautical traffic rules for preventing
collisions on the water.
Scope The length of the anchor rope or
chain. 6 to 1 scope means that the
length of the anchor rope from the
boat to the anchor is 6 times the depth
of the water.
Scupper A hole allowing water to run off the
deck.
Sea Anchor A floating canvas cone held open by
wire rings with an opening in the
smaller end and a rope bridle at the
larger end attached to a line leading to
the vessel; used in storm conditions to
(a) keep the bow of the boat to the
wind, and (b) slow downwind drift of
the boat.
Seacock A thru-hull valve; a shutoff on a
plumbing or drain pipe between the
vessel’s interior and the sea.
Slip (1) A berth for a boat between two
piers or floats; (2) The percentage
difference between the theoretical and
the actual distance that a propeller
advances when turning in water under
load.
Sole The cabin or cockpit floor.
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