Long, long ago I had a sail boat and from those days I remember now that she would yaw terribly, about 40° while at anchor in a moderate wind. An anchored boat is an unstable system, mainly because of its topsides that act as a (bad) foresail. Actually, the wind tends to put the boat broadside to …

It’s just the limitation of the vessel, I just don’t anchor if the forecast is more than 35 kts. It’s possible to get caught of course but in general it is a situation for example in the trades where there is a steady winds and a squall line passes. Generally if the ship drags it’s only a ship lengt…

@yacht_sailor A large ship has a remarkably flexible hull compared to a small yacht. At anchor with the main plant shut down, it’s a thing of wonder. You can see the full length fore and aft passageways below the main deck snaking as you would under way but the hollow sound of the steel plates flex…

[IMG_4193] The value of the various active forces, yawing and swinging depend mainly on the relative longitudinal positions of 4 geometric points in the ship: The center of gravity of the boat (G) The anchor roller (B) The centroid of aerodynamic forces (A) The centroid of hydrodynamic forces (H) …

If the ship is dragging anchor in the so-called figure 8 pattern, at the end of each “8” the ship will sometimes drag the anchor a meter or two. This can be seen as the ship slowly works it’s way downwind. That implies that the ship is lifting all it’s anchor chain off the bottom, so why not just …

No need to lift the flukes, just the chain. If the chain, at the anchor, is lifted 15 degrees it is estimated the anchor loses about half it’s holding power. From here .

The two ships tied alongside each other can be seen is one new ship with a combined center of gravity and displacement. The combination of these ships will take more force to turn while the aerodynamic force is about the same as for one ship. This is probably the reason that the combination will not…

Another thing that may not scale up, but kellets are designed to keep the chain on the bottom.

When I use google to search for anchor information I always use “-boat” and “-yacht” so I don’t have scroll though hits that are irrelevant.

Anchored Vessels Behavior in Wind

Professional Mariner Forum

Dutchie April 10, 2019, 12:19pm 58

I am not sure that the anchor’s flukes are entirely lifted out of the seabed, perhaps it is more of an enormous yank on the shank that cuts and pulls the anchor through the seabed a couple of meters.

There is some anchoring discussion to found here.

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Anchored Vessels Behavior in Wind

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