Tack Swivel – For Top-down furling of a gennaker / asymmetric spinnaker

The Tack Swivel is designed to convert a standard CXr furling system into a top-down furling system. The lower end is an eye that fits to the CX/CXr drum and the upper end is a fork accepting the Seldén Nail terminal, a tackboard or a regular Seldén thimble.

The Tack Swivel adaptor is made from machined aluminium, providing strength without unnecessary weight. It features a stainless steel tack ring with Torlon® ball bearings to ensure smooth rotation even under high load. A Dyneema lashing is provided for attaching the tack of the sail to the Tack Swivel.

Top-down furling explained:

The sail is connected only at two points: the halyard swivel at the top and the Tack Swivel at the bottom. As the sail is freeflying between these points, it cannot be furled like a tradititonal sail. Instead, the AT-cable transfers the furling motion from the top, starting to furl the head of the sail first. As the cable continues to rotate, the furl progressively works its way down until the sail is completely furled.