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Notes -
Can't imagine that's the case. The combination of tens of feet of draft and more than 10:1 aspect ratio of the hull should make significant lateral slip almost impossible. Even if sideward movement would be a problem, a relatively small, retractable foil at the front of the vessel should be able to compensate for that (in combination with the rudder).
I suspect bunker fuel is just to cheap. A kite system is purely additive (you need everything on board you've always needed, and then there's the new kite). So you save a couple of thousand dollars per day on fuel - if you're not becalmed, large parts of the Atlantic and Pacific are notoriously calm - but now need to train crew, maintain a new system, pay off the additional capex and deal with additional risk. The amortization period is probably to long for such a conservative industry.
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