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No sail can be trimmed or hoisted without using a winch. The grinders supply the power to the winch and answer the demands of their "client" the trimmer.
There are three grinding positions:
Aft grinder (mainsheet traveller): trims mainsail and helps with runners (wire that holds up mast - must be swapped from side to side with each tack.)
Mid grinder: helps with mainsail and is responsible for direction of power to winches using buttons on floor. Also ensures there is enough manpower on each winch when required.
Primary grinders (two): use front pair of handles for genoa and spinnaker and hoisting sails.
Grinders need to be very fit and strong - tacking and gybing require large bursts of energy to transfer the sail from one side to the other.
