A B C D E F G H I J K L M N O P Q R S T U V W

 

Tack

A change of direction by turning the bow of the boat through the wind. Bottom forward corner of a sail.

Tack line

Line that attaches the tack of an asymmetric spinnaker to the bowsprit or spinnaker pole. The tack is adjustable to allow the set of the sail to be altered for different wind conditions and to make it easier to take down.

Tackle

A system of blocks arranged so as to multiply the power being applied to a rope or line. For instance a four to one tackle will increase the force applied by four, at the expense of having to move four times as much rope.

Tidal height

Depth of water above chart datum.

Tidal range

Difference between low and high water.

Tidal stream

Direction of the tide's flow.

Tiller

A horizontal rod, bar or similar device attached to the top of the rudder and used to steer the boat.

To leeward

The side of the boat the wind is blowing out from.

To windward

The side of the boat the wind is blowing onto.

Torsion

Forces that twist, for example on the keel.

Trade winds

The stable, strong wind which blows both sides of the equator.

Transit

Lining up two fixed objects to keep you on course, for example, if the tide is pushing you sideways.

Transom

The flat bit across the back or stern of the boat.

Traveller

A moving car, usually with ball bearings, that runs on specially made track to allow a sheet lead to be adjusted.

Trim

Keeping the boat level fore and aft.

Trimmer

Crew member with special responsibility for adjusting the sails to every nuance of wind speed or direction.

True wind

The direction and strength of the wind when the boat is dead in the water. When underway, instruments calculate the true wind by taking into account boat speed and relative wind.

Trysail

An emergency sail for very severe wind conditions. Made from heavyweight synthetic sail cloth, usually set without a boom and often tied round the mast so it can be used if there has been a major failure of the mainsail or mast.