In order to cover a
chaser, hold off a pursuer, or take advantage of wind
shifts, boats will need to change course on the downwind
leg.
Gybing, the opposite to
a tack, is where the stern of the boat passes through the
direction of the wind.
Like a tack, the sails
have to swap sides but the spinnaker is on a pole, which
also has to cross from one side to the other.
The key on the downwind
leg is to gain the inside line at the leeward mark.
The rear boat can often
catch up by using its spinnaker to blanket the airflow into
the lead boat's sails, slowing them down.
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