Mainship 40 Trawler Single, Operator'S Manual

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Screw -
A propeller.
Scupper pp - r
A drain from the edge of a deck or cockpit
that discharges overboard.
Seacock -
A positive action shutoff valve connected
directly to the hull seawater intake and discharge pip-
ing.
Shaft -
The long, round rod that connects the engine/
transmission to the propeller.
Shaft log g -
A fitting at the hull bottom where the shaft
connecting an engine to its propeller penetrates the
hull. A shaft log permits the shaft to rotate while simul-
taneously preventing water from entering the hull.
Sheer - r
The top of the hull’s curvature at the deck line
from the bow to stern.
Sheer strake -
The upper edge of the hull, immedi-
ately below the deck.
Sole -
Term used to refer to the deck of a boat or the
floor of the cabin.
Spring line p g -
A pivot line used in docking or to pre-
vent the boat from moving forward or astern while made
fast to a dock.
Starboard -
Looking forward, the entire right side of
a boat from bow to stern.
Starboard -
When facing the bow, the front
beam right side.
Starboard -
When looking forward, the right
quarter right rear section of the boat.
Stem -
The leading edge of a boat’s hull.
Stern -
The back of a boat.
stringer g - r
Longitudinal and transverse continuous
members used to provide a vessel with strength.
Strut -
A propeller shaft support that is below the hull.
The main strut is a large strut that is mounted imme-
diately forward of the propeller. An intermediate strut is
smaller than the main strut and is mounted between
the main strut and the shaft log.
Sump p -
A pit or well into which water is drained.
Superstructure p -
A flying bridge or other structures
that extend above the deck.
Topside p -
To go to the uppermost deck.
Transom -
The planking or structure forming the
stern of a square-ended boat.
Transverse -
Direction running across the boat.
Underway y -
A vessel that is not moored, docked, at
anchor, or aground.
V-bottom -
A hull with the bottom section that is
shaped in the form of a “V”
V-drive -
A drive system that has the output of the
engine facing forward and coupled to a transmission.
The prop shaft is then coupled to the transmission.
Water line -
The line of the water on the hull when
the boat is afloat and at rest.
Weather deck -
A deck with no overhead protection.
Windlass -
A device used to raise and lower an
anchor.
Mainship 40 Trawler Single & Twin • Glossary
14.4