How do hydrofoils perform in heavy seas?

How well do hydrofoils work in heavy seas such as the North Atlantic?

It depends on the design; some hydrofoils handle rough conditions better than others.

A viewer asks whether hydrofoils that look attractive in calmer water remain useful in North Atlantic storms. The answer depends on the design because some hydrofoils have performed better in rough conditions than others. The brief reply does not support a broader rule for the whole technology. Seakeeping still depends on the hull, foil arrangement, and intended operating environment.