10. Initial Stability Flashcards

1
Q

Term

A

Definition

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2
Q

Initial Stability

A

The stability of a vessel in the condition when the center of gravity is at its lowest point at the beginning of a voyage.

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3
Q

Metacentric Height (GM)

A

The vertical distance between the center of gravity and the metacenter. It is a key indicator of initial stability.

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4
Q

Metacenter (M)

A

The point about which a ship rolls and pitches; higher metacenter indicates greater initial stability.

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5
Q

Center of Gravity (G)

A

The point through which the weight of the vessel acts vertically downwards.

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6
Q

Righting Arm (GZ)

A

The horizontal distance between the center of gravity and the center of buoyancy when a vessel is inclined. It is a measure of the vessel’s ability to right itself.

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7
Q

Center of Buoyancy (B)

A

The center of the volume of water displaced by the ship’s hull.

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8
Q

Free Surface Effect

A

The effect on stability caused by the movement of liquids in partially filled tanks within the vessel, reducing the ship’s overall stability.

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9
Q

Rolling Period

A

The time it takes for a ship to roll from side to side, which indicates the ship’s initial stability.

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10
Q

Angle of Loll

A

The angle to which a ship with negative initial stability will lean without external force.

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11
Q

Angle of Inclination

A

The angle at which a ship is tilted due to external forces or cargo shift.

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12
Q

Dynamic Stability

A

The ability of a ship to resist overturning in rough seas, influenced by the initial stability.

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13
Q

Heeling Moment

A

The external force applied to a ship causing it to tilt or heel.

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14
Q

Static Stability

A

The initial stability of a ship in calm waters, usually evaluated by its righting arm curve against heeling angles.

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15
Q

Tender Ship

A

A ship with a high center of gravity and small metacentric height, having sensitive and quick responses to external forces.

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16
Q

Stiff Ship

A

A ship with a low center of gravity and large metacentric height, known for slow but strong resistance to tilting.

17
Q

Buoyancy

A

The upward force exerted by water displacement that supports the ship.

18
Q

Trim

A

The difference in draft between the bow and stern of a ship.

19
Q

List

A

The permanent inclination of a ship to either port or starboard.

20
Q

Roll

A

The oscillating motion of a ship from side to side.

21
Q

Pitch

A

The oscillating motion of a ship’s bow and stern up and down.

22
Q

Yaw

A

The side-to-side movement of a ship’s bow, deviating from its course.

23
Q

Surge

A

The forward and backward movement of a ship along its length.

24
Q

Sway

A

The lateral motion of a ship moving side to side along its width.

25
Q

Damping

A

The reduction of motion through resistance or friction.

26
Q

Draft

A

The vertical distance between the waterline and the bottom of the hull.

27
Q

Displacement

A

The total weight of the water displaced by the hull of a fully laden ship.

28
Q

Ballast

A

Weights placed in a ship to improve stability.

29
Q

Bilge

A

The lowest compartments on the ship, on either side of the keel, where water typically collects and must be pumped out.

30
Q

Bilge Keels

A

Attached along the length of the ship’s hull to reduce rolling motion.

31
Q

Draught (Draft)

A

The minimum depth of water a ship or boat requires to float.