A vertical plate or board for steering a boat.

Related Terms

SPREAD

The divergence of the air stream in a horizontal or vertical plane after it leaves the outlet.

GYROSCOPIC DRIFT

The horizontal rotation of the spin axis of a gyroscope about the vertical axis

HEAVE

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

SHELL PLATING

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

STEALER

A single wide plate that is butt-connected to two narrow plates, usually near the ends of a ship.

HEIGHT OF TIDE

Vertical distance from the chart sounding datum to the water surface at any stage of the tide. It is positive if the water level is higher than the chart sounding datum. The vertical distance from the chart sounding datum to a high water datum is called RISE OF TIDE.

HEELING ERROR INSTRUMENT

Heeling adjuster. Also called VERTICAL FORCE INSTRUMENT

MODEL ATMOSPHERE

Any theoretical representation of the atmosphere, particularly of vertical temperature distribution.

POLAR COMPOUND

A chemical compound whose molecules exhibit electrically positive characteristics at one extremity and negative characteristics at the other. Polar compounds are used as additives in many petroleum products. Polarity gives certain molecules a strong affinity for solid surfaces; as lubricant additives (oiliness agents), such molecules plate out to form a tenacious, friction- reducing film. Some polar molecules are oil-soluble at one end and water-soluble at the other end; in lubricants, they act as emulsifiers, helping to form stable oil-water emulsions. Such lubricants are said to have good metal-wetting properties. Polar compounds with a strong attraction for solid contaminants act as detergents in engine oils by keeping contaminants finely dispersed.

WICKING

The vertical absorption of a liquid into a porous material by capillary forces.

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