The square sail set above the course sails (lowest) of a sailing ship, usually paired with an upper topsail.

Related Terms

BOLTROPE

A strong rope stitched to edges of a sail

TO HAUL

To change the course of a sailing vessel to bring the wind farther forward, usually used with up, such as haul up.

HORIZON SYSTEM OF COORDINATES

A set of celestial coordinates based on the celestial horizon as the primary great circle; usually altitude and azimuth or azimuth angle.

AUXILIARY CONTACTS

A set of contacts that perform a secondary function, usually in relation to the operation of a set of primary contacts.

FORESAIL

The lowest sail set on the foremast of square-rigged ship

FORESAIL

The lowest sail set on the foremast of square-rigged ship

INDEX CHART

An outline chart showing the limits and identifying desig- nations of navigational charts, volumes of sailing directions, etc.

DISPLACEMENT PUMP

Pumps in which energy is added to the water periodically and the water is contained in a set volume.

DEMAND CONTROL

A device which controls the kW demand level by shedding loads when the kW demand exceeds a predetermined set point.

DRIFT

Term used to describe the difference between the set point and the actual operating or control point.

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