A sail control that lets one apply downward tension on a boom, countering the upward tension provided by the sail. The boom vang adds an element of control to sail shape when the sheet is let out enough that it no longer pulls the boom down. Boom vang tension helps control leech twist, a primary component of sail power.

Related Terms

BOLTROPE

A strong rope stitched to edges of a sail

ADJUSTABLE DIFFERENTIAL

A means of changing the difference between the control cut-in and cut-out points.

ACTION

Refers to the action of a controller. It defines what is done to regulate the final control element to effect control.

SHED MODE

A method of demand control that reduces kW demand through shedding and restoring loads.

AIR BREATHER

A device permitting air movement between atmosphere and the component in/ on which it is installed.

CATALYST

A substance which speeds a chemical action without undergoing a chemical change itself during the process. Now used in catalytic converters to control amount of unburned hydrocarbons and CO in automobile exhaust.

AUTOMATIC FROST CONTROL

Control which automatically cycles refrigerating system to remove frost formation on evaporator.

CATALYTIC CONVERTER

An integral part of vehicle emission control systems since 1975. Oxidizing converters remove hydrocarbons and carbon monoxide (CO) from exhaust gases, while reducing converters control nitrogen oxide (NOx) emissions. Both use noble metal (platinum, palladium or rhodium) catalysts that can be 'poisoned' by lead compounds in the fuel or lubricant.

AUTOMATION

The employment of devices, which automatically control one or more functions.

CHIP CONTROL FILTER

A filter intended to prevent only large particles from entering a component immediately downstream. Also known as Grit control filter, Last-chance filter

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