jackyard topsail

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A triangular topsail set above the mainsail in a gaff-rigged sailing vessel. It sets a larger area of sail than a jib-headed topsail as both the luff and the foot of the topsail are laced to jackyards which extend beyond the top of the mast and the peak of the gaff. But see also marconi rig.

Subjects: Maritime History.

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