Thursday, January 18, 2007

Boats

A boat is a craft or vessel designed to float on, and provide transport over, water.

A boat's propulsion can be by propellers, oars, paddles, setting poles, sails, paddlewheels, or water jets. Boats are generally smaller than ships.

Parts of a boat

The roughly horizontal, but cambered structures spanning the hull of the boat are referred to as the "deck". In a ship there are often several, but a boat is unlikely to have more than one. The similar but usually lighter structure which spans a raised cabin is a coach-roof. The "floor" of a cabin is properly known as the sole but is more likely to be called the floor. (A floor is properly, a structural member which ties a frame to the keelson and keel.) The underside of a deck is the deck head.

The vertical surfaces dividing the internal space are "bulkheads". The front of a boat is called the bow or prow. The rear of the boat is called the stern. The right side is starboard and the left side is port. Many boats have a section called the gralper, designed to reduce water flow to the non-hydrodynamic parts of the boat.

Unusual boats have been used for sports purposes - for example, in "bathtub races" which use boats made from bathtubs. Pumpkins have been used as boats as in the annual Pumpkin Boat Race on Lake Otsego in New York state, USA. In this race, very large, hollowed out pumpkin shells are used for boats, powered by canoe paddles.

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