but at low speeds, the advantages of a tunnel hull over a pontoon would likely be nonexistent.
The idea of a tunnel is to close off the space between the pontoons to create an air trap and use the pressure imbalance to lift the hull and minimize contact with the water. This cannot happen at the speed of a kayak and would, essentially, function as pontoons.
I have seen kayak hydrofoils (there are videos on Utube) and those do work at surprisingly low speeds, though it is a lot of effort to get the lift one needs. Not sure there is a practical method of doing this with pedal power alone.
But all this isn't the point. The point was about tracking and I don't see a tunnel system as benig of any appreciable advantage, though I'll admit I could be wrong about that.
The Kayak Wing
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