Or course keeping is mostly a function of block co-efficient, which can be simplified to length to width ratio for most discussions. Longer, more slender boats track better than short wide ones. Tunnels, keels and pretzels have little effect except to compromise handling.
The second greatest determinant of tracking is stern rocker, the less the better, but that is mostly a function of the hull countering poor paddling technique: not getting the paddleshaft vertical, carrying the blade aft of the body, paddling along the rail not parallel to the centerline, etc. Tunnels, keels and pretzels don't help much there either, but a SUP fin would. All in all, it's easier to learn to paddle.
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