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Macroscien said..
more like duck gybe not tack 49s (?)
Duck tack (this one is old school - new school is going switch before ducking the sail). Both the sail movement and the foot work are more similar to a duck jibe than a tack, but the nose of the board turns through the wind, hence it is a tack.
With a sail, duck tacks and heli tacks are the only tacks where foiling through is possible. Going around the mast as in a regular tack puts the board down on the water - although the best guys keep enough speed to stay planing. With a wing, foiling through is possible, but harder than foiling through jibes.