X-Drive Taffeta Carbon - Cruising Genoa

A Najad 505 with X-Drive Carbon double taffeta sails. Both the main and jib have vertical battens for roller furling.

Carbon fiber is the highest performance yarn used in sailmaking. As the chart below shows, carbon yarns are at the top of the chart in three out of four ways to measure the performance.  Carbon fiber’s resistance to stretch is three times greater that S-Glass yarns, which are three times more stretch resistant than polyester yarns.

An example of the greater coverage of tapes on an X-Drive roller/reefing genoa. Also notice the optional extra vertical tapes are the two reef points, which carry the luff loads when the sail is reefed.

Even though the individual tapes in an X-Drive sail are very narrow, their almost complete coverage of the sail, leads to a smooth flying shape. UK Sailmakers’ tape laying machine puts down up to 11 tapes at a time in a 20 cm wide path (8 inches wide), which means there are hundreds of tapes on the sail. Since each tape has 4,000 carbon filaments there are up to 44,000 filaments of carbon are laid at time, giving the sail great strength along with the ability to retain its designed shape without distortion. This means we can use lighter and less expensive laminates than would be used in Tape-Drive sails and the savings are passed on.

All the carbon yarns used in X-Drive tapes are dry—not coated in glue—which keeps them from becoming brittle. Keeping the carbon yarns dry improves their flexibility.

Close-up of carbon X-Drive tapes on a polyester/taffeta laminate.

Extra Durability With Taffeta

A Dufour 40E with X-Drive carbon sails a partial black taffeta protection. The taffeta is applied over the tapes on the genoa to protect the part of the leech that gets dragged across the shrouds and the mast every time the boat tacks. The mainsail has a partial taffeta layer on the leech to reduce the harmful effects of luffing and flogging.

To help protect today’s sails and extend their peak performance lives, UK Sailmakers can build all our X-Drive racing sails where one or both sides of the laminate is fully covered with a lightweight finely-woven polyester taffeta. Not only does taffeta protect the film layer from abrasion, but it also prevents cracking of the film and reduces creasing. While taffeta doesn't add any strength, it does make sails last longer. We also offer the option of putting a layer of taffeta over the X-Drive tapes only on the leech of the sail as shown below.

  When the sun hits the taffeta of an side of an X-Drive sail, it appears all white like a dacron sail.

When the sun hits the taffeta of an side of an X-Drive sail, it appears all white like a dacron sail.

Partial Taffeta Options

Genoa Partial Taffeta Options.jpg

The leech of any sail benefits from having extra taffeta protection; when a sail luffs, the leech is the area most exposed to flogging, abrasion, and potential damage. This is particularly the case for boats with overlapping genoas that get dragged across shrouds and the mast in every tack. 

UK Sailmakers will work with you to determine the right amount of taffeta to add to your sails based on your boat, the kinds of sailing you do, and your budget. Having both sides covered with taffeta makes a sail more durable, but also would make the sail heavier. UK Sailmakers offers a Partial Taffeta option to save weight and cost.

Taffetas are available in either white or grey.

Partial taffeta on the leech of a vertical-batten jib. The taffeta reinforces the area of the sail that may come into contact with the mast and rigging. This part of the leech gets whipped around the most during tacking and luffing.

The genoa shown above has taffeta on the part of the sail overlapping the mast to protect the tapes and the sail's mylar layer. This boat's mainsail also has a partial taffeta layer up the whole leech.

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