You're standing on the dock. You see a

ship floating at an angle, maybe five or

10° off level, leaning to one side. Your

first thought might be that something's

wrong. The ship is sinking or in

distress, but not always. Ships tilt for

different reasons. Some tilts are normal

and fixable, and some look perfectly

stable and are actually a moment away

from capsizing. Understanding the

difference matters. So, how do you tell

them apart? That's what we're going to

work through today. When a ship tilts,

it's not just one thing. The maritime

industry has different names for

different types of tilt because each one

[music] means something specific.

There's a list. Heel, angle of lol, and

trim. Each of these has different

causes, different stability

characteristics, different levels of

danger, and of course, different fixes.

A ship leaning 10° to port could be

perfectly safe in the middle of a normal

turn or about to capsize, depending on

the type of tilt it is. List is the one

most people have seen without even

realizing it. A ship with a list is

leaning to port or starboard and it

stays there. The tilt doesn't go away

when the wind dies down or the waves

stop. Even in completely calm water, the

ship remains at that angle. The cause is

almost always uneven weight

distribution. Cargo loaded heavier on

one side than the other. Containers

stacked unevenly, grain or other bulk

cargo shifting during voyage, fuel or

ballast tanks emptied or filled in a way

that puts more weight on one side. It

can also be caused by flooding. If water

enters one side of the ship through a

damaged compartment, for example, but

not on the other, the ship will list

towards the flooded side. Now, here's

the question you're probably asking. Is

this dangerous? A small list isn't

usually a serious problem. At 2 or 3°,

it's barely noticeable. 5° obvious to

anyone [music] on the dock. 10° or more

starts affecting how the ship operates.

Crew can't walk normally. equipment

doesn't sit level and cargo handling

becomes difficult. Here's the reassuring

part. A ship with a list is still

stable. Look here. The center of gravity

is offset from the center, but it's

still below the metaentric height,

meaning a positive GM. Think of it like

a weeble. It's leaning, but the weight

distribution still wants to pull it back

toward [music] a resting point. It's

found a new equilibrium at that angle.

It won't keep tipping on its own. That

makes list fixable. Crew can

redistribute cargo or pump ballast water

from one side to the other to counter

the imbalance. Basically removing or

adding weights in the right places.

Fairies develop a small list sometimes

when vehicles aren't parked

symmetrically. Container ships

occasionally show a list after loading

if the weight distribution wasn't

calculated correctly. In both cases, the

crew corrects it. List is a manageable

problem and it is universal. No matter

where the ship was built or where it

sailed to, which is exactly like SE eim,

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navigation 15 at checkout. The QR codes

on the screen and links in the

description below. Now back to ship

tilts because not every problem is as

easy to fix as a list or with sail eim.

Heel looks similar to list. The ship

leans to one side but the cause and

behavior are completely different. Heel

is temporary. Sometimes it's caused by

an external force such as a strong wind

pushing against the side of the ship and

her superructure. And when that force

stops, the ship returns to upright.

Sailing vessels heal dramatically under

wind pressure. It's a normal part of how

they sail. The most common occurrence is

during turning. You know the feeling.

You're in a car going around the bend

and your whole body leans to the

outside. A ship does exactly the same

thing. The faster the ship, the tighter

the turn, the more it heals. Waves can

cause temporary heal as they pass. So

can cargo operations. A crane lifting a

heavy load out to one side shifts that

balance momentarily.

So, what brings the ship back upright?

The same stability that keeps it afloat

in the first place. As soon as the force

disappears, the ship's weight

distribution [music] pulls the ship back

to level. It doesn't need the crew to do

anything. It just corrects itself. It

only becomes dangerous when the healing

force exceeds the ship's stability

limits. extreme weather, an overloaded

ship or a combination of forces can push

a ship past the point where it can

recover. But under normal conditions,

heel is just part of how ships move

through water. The angle of lol is one

that fools people. A ship with an angle

of lol is leaning to one side, sitting

at a steady angle. It looks like a list.

The ship is floating. It's not visibly

sinking and everything seems under

control. But she is in critical

condition and could capsize at any

moment. So why is a ship that looks

stable actually on the edge of

capsizing? Think of a stable ship as a

weighted toy. The heavy part is at the

bottom, the light part at the top. That

low weight is what pulls it back upright

whenever it tilts. In technical terms, a

stable ship has a metaentric height

above its center of gravity. positive

GM. An unstable ship looks almost

identical, but its center of gravity is

above the metaentric [music] height.

Now, tilt both of them. Here's what

happens. For the stable ship, as it

tilts, the buoyancy shifts to the low

side and the weight stays on the heavy

side. Those two forces acting on

opposite sides create a writing moment.

A force that pushes the ship back

upright. Tilt it, it corrects. For the

unstable ship, the forces flip. Weight

on the low side, buoyancy on the high

side. Instead of a writing [music]

moment, you get a capsizing lever. Now,

because GM is negative, the ship can't

stay upright. It tips to one side,

[music]

but it doesn't capsize immediately. It

settles at an angle known as the angle

of lol, [music] where it finds a

temporary fragile equilibrium. And this

is what makes it so dangerous. The ship

looks stable, but it has almost no

writing energy. Any disturbance, a wave,

a gust of wind, crew moving cargo can

push it past that tipping point. And

once it goes, it capsizes fast. There's

another counterintuitive part. A ship at

an angle of lull can flop to either

side. It might be leaning to port one

moment, then suddenly roll through

upright and settle to starboard. That

sudden movement alone can be enough to

capsize it. And correcting it the wrong

way makes it dangerous. For list, you'd

pump ballast to the high side to level

the ship. Do that with an angle of lull

and you trigger a violent roll to the

other side. The correct fix is to

[music] lower the center of gravity. Add

weight low in the ship. Remove weight

from up high. Fill or empty tanks to

eliminate the free surface effect,

[music] but it has to be done carefully

and in the right order because the ship

has to pass through the unstable upright

[music] position to recover. The Herald

of Free Enterprise capsized in 1987.

Water flooded onto the car deck. The

center of gravity rose and stability was

gone. People died. The European Gateway

capsized in 1982 under similar [music]

conditions.

That's the difference between list and

lol. A ship with a list is stable and

leaning because of uneven weight. A ship

at an angle of lol is unstable and

leaning because it's lost the ability to

write itself. Everything so far has been

about a ship leaning sideways. But

there's one more direction forwards and

backwards. That's trim. If the bow sits

lower than the stern, the ship is down

by the head. If the stern sits lower

than the bow, it's down by the stern.

Trim is measured by the difference

between how deep the ship sits at the

front and how deep it sits at the back.

The causes are similar to list just

along the longitudinal axis. Cargo or

ballast concentrated towards the bow or

the stern, flooding in a forward or aft

compartment, fuel burning off from tanks

at one end of the ship during voyage.

Trim usually isn't an immediate danger

the way angle of law is, but it affects

how the ship performs. Too much weight

forward and the bow digs into the water.

This can affect steering and slow the

ship down. The propeller at the stern

might rise too high, losing efficiency

or even breaking the surface. Too much

weight aft and the bow rises high. That

can reduce visibility from the bridge

and change how the ship handles.

Sometimes a ship is deliberately trimmed

by the stern because that keeps the

propeller fully submerged and working

efficiently. Bulk carriers adjust it

depending on the cargo. Tankers manage

it constantly throughout loading and

discharge. So, back to you on the dock

looking at that ship leaning at an

angle. When you see a tilted ship, it

isn't always in trouble. If it's

healing, it's in the middle of a turn or

the wind is pushing it. It'll come back

on its own. If it's listing, the weight

is uneven. The crew knows they're

already fixing it. If it's trimmed, bow

or stern sitting low, that's probably

deliberate. The one that matters is the

angle of lull because it doesn't look

like an emergency. The ship is floating.

The deck is steady. Everything seems

under control. But the ship has lost its

stability. And a single wave or a shift

in weight can send it over. The MVC wall

covered in our video on the inclining

test is [music] the most recent reminder

of what this looks like when it goes

wrong. Cargo shifted, the ship listed,

[music]

and what looked manageable at first

ended in capsize. If you want to hear

more about the MVC wall, please check

the link in the description down below

[music] if you haven't yet seen that

video. If you enjoyed this video, please

make sure to like and subscribe if you

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all of our latest videos. Before you go,

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the screen right now. The link is in the

description below. Thank you very much

for watching and we'll see you all in

the next video.