Other Stitching Techniques that Work Well

0

round stitching

round stitching

We principally looked at three means of seizing an eye without splicing-basting, round-stitching, and seizing-used alone and in combination. Round stitching is described in detail in the accompanying main article, along with photographs. Here are some of the other stitching patterns we tested.

Basting

Sailmakers commonly place a double row of basting stitches down the center. A plain whipping is applied at both ends to resist peeling forces and to add some strength. It is a simple and proven method. However, during many trials, we found the strength to be considerably less than round stitching (72 percent of the lines breaking strength for basting versus 90 percent of the lines breaking strength for stitching), and the splice shifted and worked more than round stitching under high load. You also need to use more line to provide the same holding strength, which is impractical and leads to lower strength in larger sizes and differential stretch between the two legs of the splice.

Basting stitching longer than 3 inches in polyester concentrates stress on individual stitches and can lead to zippering of the stitching at high load. However, we preferred this method for smaller line-quarter-inch diameter and less. It is easier than round stitching, less likely to damage the line, and we liked the seaman-like appearance. Basting also better resists chafe, since much of the stitching is pulled level with the surface of the line.

Tapering

Stitched eyes have an edge where the tail ends, and this will snag; in some applications, it will matter (spinnaker sheets), and in many others, it will not (tackle becket, topping lift, etc.).

Tapering the eye will make it snag-free. Simply expose a length of core that is about four times the diameter of the core, trim off three quarters of it, and pull the cover back over the end. Stitch down the cover and cover the taper with a whipping. (See the photo with the How We Tested accompanying this report.)

The length of this cover does not need to be more than two times the diameter of the rope in length. There is little strength in this stitching; the line will stretch under load, and the long cover becomes a failure point. The stitches in the cover or last half-inch or so of the rope will not add to the splice strength. Do not taper stitching. Again, this only reduces the strength of the splice in the critical zone and does not have the same benefits as tapering a tuck splice.

Seizing

We expected that seizing would be a simpler and more robust method for do-it-yourself sailors; what we learned was the exact opposite. When traditional riggers seized three-strand hemp rope, they had several advantages: high friction material, the bumps formed by the lay, and modest strength requirements.

We had no trouble reaching breaking strengths with hemp rope, even with less-than-perfect seizings. But when we set to work on double braid, everything we created slipped at pitifully light loads, and we had to learn all over.

Our early attempts slipped at a paltry 600 pounds per inch of seizing on half-inch rope. Later, we learned to pre-tension line and to put the twine under greater tension using a serving mallet. Doing this, we reached 800 pounds per inch. You might do better, but we didn't find seizing to be a predictably strong method; we were never sure of the strength of our handiwork.

Darrell Nicholson, editor of Practical Sailor, grew up boating on Miami’s Biscayne Bay on everything from prams to Morgan ketches. Two years out of Emory University, after a brief stint as a sportswriter, he set out from Miami aboard a 60-year-old wooden William Atkin ketch named Tosca. For 10 years, he and writer-photographer Theresa Gibbons explored the Caribbean, crossed the Pacific, and cruised Southeast Asia aboard Tosca, working along the way as journalists and documenting their adventures for various travel and sailing publications, including Cruising World, Sail, Sailing, Cruising Helmsman, and Sailing World. Upon his return to land life, Darrell became the associate editor, then senior editor at Cruising World magazine, where he worked for five years. Before taking on the editor’s position at Practical Sailor, Darrell was the editor of Offshore magazine, a boating-lifestyle magazine serving the New England area. Darrell has won multiple awards from Boating Writer’s International, including the Monk Farnham award for editorial excellence. He holds a U.S. Coast Guard 100-ton Master license and has worked as a harbor pilot and skippered a variety of commercial charter boats.

LEAVE A REPLY

Please enter your comment!
Please enter your name here