this question was in my mind for years… if the anchor keeps the huge ship from drifting, how do you get free when you want to sail away ?
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I’m sure people will have better answers, but essentially:
1) anchor type is used based on ground type to address this
2) they do sometimes, you can get them out by maneuvering the ship to pull on the anchor in different directions to dislodge it
3) sometimes (mostly smaller ships) you just cut it free
4) sea beds where it’s shallow enough to anchor aren’t usually riddled with large rocks, and Anchorages are chosen for considerations like bottom type
Anchors resist a sideways pull. When anchored you have enough anchor rode (rope and/or chain) for at least double the depth of water. The weight of the rode makes it form a curve called a catenary which means that at the anchor the pull is almost completely horizontal.
Then when you want to raise the anchor you pull in the rode until it is straight up and down. This rotates the anchor and breaks it out of the seabed without much resistance.
As for avoiding getting the anchor stuck in rocks, the trick is not to anchor in places with rocks. A lot of seabed is mud, sand, shingle etc.
In addition to the other answers, there are sea anchors and drogues that can be used where the seabed is too far for an anchor to reach.
In addition to the other answers, there are sea anchors and drogues that can be used where the seabed is too far for an anchor to reach.
In addition to the other answers, there are sea anchors and drogues that can be used where the seabed is too far for an anchor to reach.
I have been on an aircraft carrier, The chain would rip a boulder right out of the sea floor before it would break.
I have been on an aircraft carrier, The chain would rip a boulder right out of the sea floor before it would break.
I have been on an aircraft carrier, The chain would rip a boulder right out of the sea floor before it would break.
The sheer weight of the chain and the drag that it causes in the water is what keeps large ships in place. Anchors on these massive ships don’t need to jam into anything at all to do their jobs, so the idea is to never have them land anywhere where it could be an issue.
The sheer weight of the chain and the drag that it causes in the water is what keeps large ships in place. Anchors on these massive ships don’t need to jam into anything at all to do their jobs, so the idea is to never have them land anywhere where it could be an issue.
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