Mon, Oct

Defining the Transverse Section

Naval Architecture

Defining the Transverse Section

Picture shows typical cross-sections of a ship near amidships and near the bow. It will be noted that:

• The upper, weather, deck is curved so that any water will drain to the sides. The amount by which the centre of the deck is above the side is known as the camber. Decks other than the weather deck usually have no camber as not having one facilitates construction.

• The beam at the deck may be less than that at the waterline. The difference is termed the tumble home. If the beam at the deck is greater than that at the waterline the difference is said to be the flare.

• The bottom of the hull may rise from the keel to the turn of bilge. This rise is called the rise of floor.

• The distance of the deck at side above the waterline is known as the freeboard. The greater the freeboard the greater the volume of the hull above water. Assuming this volume is watertight, it represents a reserve of buoyancy should the ship take on extra weights or lose buoyancy from the main hull.

ship transverse section