that a tunnel hull has any special attributes at paddling speeds over a keel. I can see why these high speed racing boats use what is basically pontoons, but there is no way you'll get this type of performance while paddling. One simply can't move quickly enough (watch the speed of the racing boat in the video when the bow comes up off the water and how quickly the boat goes from 129-170 - pretty amazing).
As for tracking, I'm certain that a tunnel will have more slippage than a keel, but whether that is appreciable at low speeds, I cannot actually say, though I would guess that in following wave conditions, it would be noticable.
URCHIN Portable Anchor
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