The moment required to cause a one centimetre change of trim in the vessel.

Related Terms

CENTER OF EFFORT

The point of origin of net aerodynamic force on sails, roughly located in the geometric center of a sail, but the actual position of the center of effort will vary with sail plan, sail trim or airfoil profile, boat trim, and point of sail. Also known as center of pressure.

SQUARED AWAY

Yards held rigidly perpendicular to their masts and parallel to the deck. This was rarely the best trim of the yards for efficiency but made a pretty sight for inspections and in harbor.

BALLAST

Any liquid or solid weight placed in a ship to change the trim, increase the draft, or to regulate the stability

MARGIN LINE

A line, not less than 3 in below the top of the bulkhead deck at side, defining the highest permissible waterplane in the final condition of sinkage, trim and heel

TRIM

The difference between the draft forward and the draft aft. A ship is trimmed by adjusting the location of fuel, cargo, ballast, etc.

SQUAT

For a vessel underway, the bodily sinkage and change of trim which are caused by the pressure distribution on the hull due to the relative motion of water and hull. The effect begins to increase significantly at depth-to-draft ratios less than 2.5. It increases rapidly with speed and is augmented in narrow channels.

BRACE

1) Rope or wire rigged to a spinnaker pole to control its fore and aft position. 2) Tackles to trim square sail yards of sailing ships.

DRAUGHT MARKS

Numbers placed as a vertical scale at bow and stern to indicate a vessel's draught at the points, enabling trim to be monitored.

HARDEN

To trim sheets of a sail tighter to create a flatter sail.

MCT 1CM

The moment required to cause a one centimetre change of trim in the vessel.

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