Common wisdom", again, says that folding kayaks are typically less of a "performance boat" than hardshell kayaks. This is only partially true and requires some examination. Folding kayaks are not all inherently slow; their models run a range of speeds just as hardshell models do.
Real life experience and races in which a mix of hardshells and foldables participate tend to indicate that foldables are as fast or faster than about 80% of hardshell kayaks. If you are in a folding kayak on a club trip or paid tour, you will not find that every hardshell will be ahead of you. Only some might.
Much depends on conditions. In absolutely flat, calm water, foldables, which tend to be wider, are a bit less efficient to paddle, i.e. You may have to put more effort into your stroke to accelerate and maintain the same constant speed as a narrower hardshell boat.
As conditions get rougher, though, the inherent stability and seaworthiness of their design makes them the more efficient craft. You can ... more.
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