Subtitles section Play video
-
Whats up everyone Today lets do anchoring
-
Drop port anchor!
-
HWAT?!
-
So theres alot types of anchor out there, the most common type now days on merchant
-
navy ships, especially large ships, are the stockless type.
-
And that's mainly because the design is flat and can be stored away easily.
-
Usually you'll see it tucked away just beneath the bow.
-
This one here is our spare anchor.
-
A typical stockless type will have its crown, the arms and the flukes in one piece, its
-
design to pivot on the shank. The shank is the term for the center piece.
-
Contraty to many believe... the anchor actually dont hold the ship, the anchor only digs into
-
the sea bed and holds the chain.
-
Its the length and weight of the chains that holds the ship.
-
Its all about horizontal force , later I will show you guys how it works.
-
Now At the forward station we've got two anchors , one on each side which can be lowered or
-
heave up control by the windlass.
-
The anchor chain leads up to the hawse pipe through the windlass, down the spurling pipe
-
into the chain locker where its stored.
-
Here is the chain locker, normally its kept closed but today I was following chief mate
-
for an visual inspection.
-
The big drum is called the Gypsy.
-
Some item of interest here are the guillotine bar, also known as bow stopper or pawl bar.
-
which traps and holds the chain in place, incase the brake fails.
-
The metal wire attached are the lashing holding it in place when not in use.
-
By putting the dog clutch into gear, we can either heave up or lower the anchor.
-
Windlass is the term for this whole system used to heave up or lower anchor and mooring
-
lines.
-
The anchor alone is about 9000kgs or 20,000 lbs, plus the chains thats quite heavy, which
-
is why using the windlass its still a slow process.
-
Heaving up is always going to be slow, But for lowering the anchor there is actaully
-
another way , a faster way which is to let the anchor fly out.
-
What that means is having the anchor chain disengaged from dog clutch and brakes, and
-
lowered by gravity.
-
The only way to stop it though is by engaging the brakes.
-
Here is what it looks like.
-
As you can see it is quite violent, lots of vibration, debris flying everywhere, and a
-
lot more risky then by motors.
-
If you aren't careful this might happen.
-
If we still have the anchor, well brakes on tight, bar down and pin in, securing the anchor
-
So how do the anchor, anchor chains hold the ship in place?
-
Well remember the keyword is horizontal forces.
-
Casey Nesitat time Let me show you from the begining
-
The ship should always be down wind or down current whichever is stronger, slightly drifting
-
backwards . so that when a anchor is lowered into the water, the crown catches and set
-
onto the sea bed. with the engine and or the current, walking the ship back to pay out
-
the chains.
-
A useful trick to figure out the current or tidal direction is simply just look at the
-
nearby anchored ships, all anchored ship will follow the heading of current.
-
A horizontal pull gives the anchor its holding power digging into the sea bed.
-
The weight of the chain, this curve section also known as the catenary, holds the ship.
-
So the more chain laid, the greater the holding power
-
A general rule of thumb is 1:5 ratio for good weather, 1:7 or more for bad weather.
-
It varies between ship size and type.
-
For deck officers, An anchor circle should be drawn with the radius being the length
-
of cables laid plus from bow to radar antenna so that you can monitor the ship on radar
-
and ecidis.
-
So we drop our anchor plus how many cables we laid out plus the ship's length
-
see this is the anchor circle on the outside, and this our track, past position swings back and forth because
-
the tidal wave is semi-durinal
-
Dont forget to show the anchor ball & signal ! Anchor light
-
During anchor watches, the crew have to check the weather and sea conditions
-
as well as status of the chain.
-
We want avoid dragging the anchor and drift somewhere or drift into another ship, that
-
would be bad...
-
The crew will look at the chain phsyically and report back.
-
The terms we use are.
-
up'n'down, short stay, medium stay or long stay. Long stay means there is a high chance
-
of dragging anchor because the chain is being pulled like this.
-
To heave up, just walk the ship over the anchor and pull up with the windlass because remember
-
it's not designed to hold vertical forces.
-
How do you count anchor chain?
-
Well, in the old days, every length of cable is marked between the shackles, one shackle
-
is about 27.5 meters.
-
Nowdays modern ships we have gauges that show how many chains are laid.
-
If you got any questions about anchoring, make sure to comment down below and join the
-
discussions.
-
Smash that subscribe button and hit me up on instagram, see you next time
