Magic boats, Wijsmuller should have patented the idea. When I first saw the concept on a paper napkin in '73 it was a couple of hours before I'd calculated that it would/could work. As for how they cope with the load in rough seas, the sea fastening can be built to suit the expected weather, it's also built to class requirements, to suit the underwriters of the load. The loaded voyages are, "Weather Routed", either from De Bilt or Bracknel, ships keep to the coast as much as possible, and await good weather windows for trans ocean runs.
Good link Shipinfo, I believe it's the USA navy destroyer "COLE" which was attacked in Aden.
Looking at those pics and the size of the load, I would imagine if that ship hit anything over a FORCE 8, she would go **** up. Then again, with new design techniques it could never happen??
I have sailed as a second mate and as a mate on these same ships. Wasn't there for the USS Cole voyage though. Can assure you that the seakeeping characteristics of these vessels is extremely good, even in the North Sea off Stavanger with a Force 10-11 blow, with a 100m+ structure carried on the back. But, as with anything else, when the going gets tough, you..............well, head into the wind!
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