A sailing tactic for handling winds too strong for the sail area hoisted when reefing the sails is not feasible or possible. The headsail is set normally while the mainsail is let out till it is constantly luffing. This creates loss of force on the main and also reduces the efficiency of the headsail while still retaining sailing control of the vessel.

Related Terms


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


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


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


A device which converts mechanical force and motion into pneumatic flow power.


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


The resisting force encountered at the common boundary between two bodies when, under the action of an external force, one body, moves or tends to move relative to the surface of the other.


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.


A device which converts mechanical force and motion into hydraulic fluid power.


Any substance that flows readily or changes in response to the smallest influence. More generally, any substance in which the force required to produce a deformation depends on the rate of deformation rather than on the magnitude of the deformation.


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

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