is not in the water as you start your roll, and doesn't get in the water until you're close to finishing. Some kayaks are more stable in the upside down position than they are right side up. (I have such a boat, and it is long.)
I have never found the planing/displacement distinction to meaningfully describe the difference between old school and new school boats. ALL kayaks have displacement hulls, and ALL kayaks can plane very nicely on a fast, green wave. Old school kayaks were designed more for straight line speed, and new school kayaks are often designed to plane on fast water.
No kayaker can paddle hard enough to get any kayak to plane. The kayaker must get help from fast water or ocean wave movement to get a hull to lift and plane.
The real distinction between old school and new school is length. New school boats are a lot shorter, trading away some speed to get better maneuvering. Creek boats usually have only minimal provision for planing. Play boats have flat bottoms and sharp chines to make them "loose" so they can stunt in a small area. River runners have flat hulls and sharp chines so they can carve into and out of eddies and do dynamic ferries. River runners are longer for speed.
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