> average velocity should be MUCH higher.

Maybe. That low to the water surface significant shrouding will be
experienced in wave trough, probably also increasing control power
consumption. Still likely faster though..

A very effective way to deal with bad weather is to dive below
wave action, meaning you don't have to build the craft to survive the
worst the Roaring Forties & Cape Horn can do.

A general-purpose craft might employ both schemes, running down
favorable winds in good weather; "gliding" in less favorable conditions.

Jack
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