Spray rails. Longitudinal members running fore and aft on the outside bottom of the hull. The purpose is to stabilize and create lift on a deep vee hull when under power.

Related Terms

HEAVE

The oscillatory vertical rise and fall, due to the entire hull being lifted by the force of the sea. Also called HEAVING

SEA CHEST

An opening for supplying seawater to condensers, pumps, etc. located in the hull below the waterline and having means for the attachment of the associated piping

SHELL PLATING

The plates forming the outer side and bottom skin of the hull

SHELL PLATING

The plates forming the outer side and bottom skin of the hull

TRIMARAN

A triple hulled vessel

FARDAGE

A wood placed in bottom of ship to keep cargo dry

HOLDING GROUND

The bottom ground of an anchorage. The expression is usually used with a modifying adjective to indicate the quality of the holding power of the material constituting the bottom

LONGITUDINAL SEAM

A riveted or welded seam along the longitudinal axis of a boiler shell or drum.

UP FLOW

The operation of an ion-exchange unit in which solutions are passed in at the bottom and out at the top of the container.

CENTERBOARD

A board or plate lowered through the hull of a dinghy on the centerline to resist leeway.

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