A Kayak is a small, relatively narrow, human-powered boat
primarily designed to be manually propelled by means of a double blade
paddle. The traditional kayak has a covered deck and one or more
cockpits, each seating one paddler. Their cockpit is sometimes covered by a spraydeck
(or "skirt") that prevents the entry of water from waves or spray and
makes it possible for highly skilled and specially trained kayakers, to roll
the kayak: that is, to capsize and right it without it filling with
water or ejecting the paddler. In modern kayaks, such recovery methods
have been replaced by a preventive approach based on increasing the
kayak's stability, and by that reducing the likelihood of its capsize.
Many modern kayaks have modified the traditional design in various ways,
such as: eliminating the cockpit by seating the paddler on top of the
boat ("sit-on-top" kayaks); having inflated air chambers surrounding the
boat; replacing the single hull by twin hulls ("W" kayak), and
replacing paddles with other human powered propulsion methods, such as
foot-powered rotational propellers and 'flippers'. Kayaks are also being
sailed, as well as propelled by means of small electric motors, and
even by outboard gas engines, when possible.
In some parts of the world, such as the United Kingdom, kayaks may be considered a subtype of canoes.
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