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Coxswain > Boat Operations > Flashcards

Boat Operations Flashcards

1
Q

Set

A

Direction toward which water is flowing, measures in True degrees

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2
Q

Drift

A

Current, wind, and waves measured in knots

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3
Q

Windward

A

Side of direction from which the wind is blowing

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4
Q

Leeward

A

Side or direction away from the wind

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5
Q

Pitching

A

Up/down motion of bow/stern

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6
Q

Rolling

A

Side to side motion

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7
Q

Yawing

A

The boat sheering off to port or starboard due to the action of waves taking charge of the stern and may cause to broach.

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8
Q

Flooding tide

A

Tidal current flowing from sea toward the shore, resulting in higher tidal stages

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9
Q

Ebb tide

A

Tidal current flowing from shore to sea, results in lower tidal stages

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10
Q

Slack tide

A

The period of no horizontal movement

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11
Q

Eddy current

A

Occurs at channel bends, uneven bottoms and near points of land. A circular current

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12
Q

Center of gravity

A

Point at which the weight of the boat acts vertically downwards

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13
Q

Buoyancy

A

The upward force of water displaced by the hull. Force of buoyancy keeps boat afloat.

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14
Q

Center of buoyancy

A

Center of gravity of displaced water.

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15
Q

Equilibrium

A

Center of buoyancy acting upwards/vertically is below the center of gravity acting downwards.

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16
Q

Heeling

A

Temporary leaning

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17
Q

Listing

A

Permanent leaning

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18
Q

Tripping

A

When a boat is pulled sideways by an opposing force. Can cause the boat to heel over beyond its ability to right itself

19
Q

Two types of stability

A

Longitudinal (fore and aft) prevents pitching

Transverse (athrwatship) prevents capsizing

20
Q

Two primary forces of stability

A

Static- inside forces

Dynamic- outside forces

21
Q

Free surface effect

A

Vessel containing liquid in a compartment. The liquid can flow from side to side which makes the boat not want to right itself. This causes loss of stability

22
Q

Free communication with the sea

A

Unobstructed movement of seawater into and out of a vessel due to damage of the hull.

23
Q

Downflooding

A

The entry of water into the hull, due to lack of maintaining watertight integrity of a vessel.

24
Q

Barometric pressure

A

Normal: 29.92

Dropping will cause warmer, cloudier weather. Continually decreseasing will cause weather to worsen.

25
Q

Surf

A

Lines of waves that mount higher as they pass over shallower water and finally break as they near the beach.

26
Q

Breaker

A

A wave or swell of the sea breaking on the shore, shoal, reef bar or inlet.

27
Q

Window

A

Area where waves have momentarily stopped breaking

28
Q

High/low side of wave

A

High- carries most potential energy

Low- least potential energy and represents the safest direction to turn

29
Q

Saddle

A

Lowest part of wave

30
Q

Closeouts

A

Two waves breaking towards each other. Should be avoided

31
Q

Shoulder

A

The edge of a wave

32
Q

Rip current

A

A relatively strong, narrow current flowing outward from the beach through the surf zone and presenting a hazard to swimmers

33
Q

Chine

A

The edge formed on the hull of a flat bottomed or V shaped boat where the bottom joins the topside.

34
Q

Hard chine lockup

A

Boat suddenly heeling 50-80 degrees on a false keel. Must turn into direction of heel and immediately back to amidships to rock MLB off it’s false keel.

35
Q

Types of breaking waves

A

Plunging
Spilling
surging

36
Q

Surf

A

Several waves or swells of the sea breaking on the shore, shoal, reef, bar, or inlet

37
Q

Swell

A

Distant wind generated waves which have advanced to calmer and more rounder form. The heave of the sea.

38
Q

Wave

A

A periodic disturbance of the sea caused by local winds

39
Q

Plunging

A

Lack of water ahead of the wave. Raises up suddenly and breaks with tremendous force.

40
Q

Spilling

A

Generated when the ocean floor has a gentle slope, gradually spills forward down its face until it is all whitewater.

41
Q

Surging

A

Wave builds very quickly and expands its anger on the beach

42
Q

Pitch

A

Distance a propeller would travel in 1 revolution

43
Q

Cavitation

A

the formation of bubbles in a liquid, caused by low pressure in the suction intake by the movement of a propeller.

This creates less pressure. Resulting in lest thrust.

44
Q

Side force/ prop walk

A

Stern moves sideways due to unequal blade thrust.

Coxswain (5 decks)

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