This is the second article about stability of heavy lifts and transports. This one covers loads that are suspended in a crane but have their horizontal movement partially restrained by some device. The first article can be found here: https://www.open-ocean.org/vessel-sta…
It also showcases the use of contact shapes, automatic ballasting and visualization of hydrostatic stability calculations.
The conclusion is that a load that is suspended from the crane but is restricted in its horizontal movement is in terms of stability almost the same as a fixed cargo item. Even though the vertical load passes through the crane. The “almost” in the previous sentence is because in the example not all horizontal movement is restricted. The jacket is still able to rotate about its base because the crane does not fully restrict the horizontal movement of the top of the crane.
If you want to challenge yourself then think about what would happen if you have not one but two cranes:
