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ocs > ship structure and stability > Flashcards

ship structure and stability Flashcards

1
Q

keel

A

bottom

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2
Q

bow

A

front

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3
Q

stern

A

back

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4
Q

hull

A

outer shell

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5
Q

stanchion

A

vertical support

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6
Q

longitudinal frame

A

bow to stern

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7
Q

transverse frame

A

side to side

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8
Q

compartment numbering

A

deck-frame-compartment-use

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9
Q

“A” usage

A

stowage

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10
Q

“C” usage

A

control

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11
Q

“E” usage

A

engineering

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12
Q

“F” usage

A

fuel tank

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13
Q

“G” usage

A

gas

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14
Q

“L” usage

A

Living

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15
Q

“M” usage

A

ammo

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16
Q

“Q” usage

A

miscellaneous

17
Q

“V” usage

A

void

18
Q

Archimedes’ principle

A

an object submerged in a fluid is buoyed up by a force equal to the weigth of fluid it displaces

19
Q

Weight (W)

A

total weight of all equipment stores and personnel. Acts vertically downward through the ship’s center of gravity Also known as displacement

20
Q

buoyancy (B)

A

weight of the ship is equal to that of displaced water. Displaced water exerts a pressure on all submerged surfaces of the ship opposing the weight (gravity) of the ship. Acts vertically upward through the ship’s center of buoyancy (B)

21
Q

Free board

A

the distance between the waterline and ships main deck

22
Q

draft

A

the distance between the waterline and the keel of a ship

23
Q

seaworthiness

A

a measure of a ship’s fitness for a sea voyage

24
Q

draft vs free board

A

as draft changes, free board changes by an equal opposite amount

25
Q

center of gravity (G)

A

determined by ship’s mass, applied at the geometric center of object, stays constant as ship moves

26
Q

center of buoyancy (B)

A

applied at the geometric center of a ship’s body underwater (submerged portion), varies as the ship moves

27
Q

unconditionally stable

A

center of gravity is BELOW center of buoyancy. regardless of the ship’s heel angle the ship always wants to right itself

28
Q

metastable

A

center of gravity is ABOVE center of buoyancy. almost all ships built fall into this category

29
Q

stability aids

A

increase resistance to rotation in water, bilge keels, fin stabilizers

30
Q

titanium hull

A

Advantages: deeper operation (stronger) lighter (more agile) Disadvantages: costly to manufacture, shortened lifespan because of less flexibility of metal causing more fatigue

31
Q

aluminum melting point

A

1220 degrees F

32
Q

steel melting point

A

2500 degrees F

ocs (20 decks)

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