Peter---- Yes, but...... Compared to the size and weight of the vessel a chain made up of one-ton links is still light and tiny. And look at the windage of the thing. Sure, its tremendous weight gives it an inertia that takes time for the wind to overcome. But it will eventually overcome it and move the ship around.
Now I'm absolute rubbish at math, so correct me if I did this wrong. A 44 pound anchor is .0014 percent of 30,000 pounds, which is the weight of our boat. A tanker that weighs 400 million pounds (200,000 tons which seems to be the average size for a typical large tanker--- but not an ultra large one) would also need an anchor that weighs .0014 percent of its weight, which would be 560,000 pounds, or 280 tons. Now maybe the anchor of a ship this size weighs that much, I don't know. They don't look it, though....
Now I'm absolute rubbish at math, so correct me if I did this wrong. A 44 pound anchor is .0014 percent of 30,000 pounds, which is the weight of our boat. A tanker that weighs 400 million pounds (200,000 tons which seems to be the average size for a typical large tanker--- but not an ultra large one) would also need an anchor that weighs .0014 percent of its weight, which would be 560,000 pounds, or 280 tons. Now maybe the anchor of a ship this size weighs that much, I don't know. They don't look it, though....
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