UV, Chafe Protection
Last fall, we reported on how to build strong, hand-stitched eyes in the ends of a rope, a skill particularly useful for older halyards and sheets that are too stiff for a typical bury splice (see PS October 2014 online). We also warned against the ravages of ultraviolet rays (UV) and chafe on the stitching, since so much of the strength lies vulnerable on the surface. In this report, we look at means of protecting stitched splices from UV and chafe.
Abrasion and Break Testing
Testers first task was to determine whether any of these coatings could weaken line in the near term. To do this, we formed 20-inch loops of 1/8-inch polyester braid and nylon braid, coated a 1-inch length of the loop with each of the products, and broke these in our test rig.
Survey: Mainsail Track Hardware
Its been almost 10 years since Practical Sailor weighed in specifically on mainsail track hardware. (See Practical Sailor, Feb. 1, 2005 online) At the time, we offered a summary of the products designed to manage what we termed the three Ss of mainsail handling-setting, shortening, and striking. In that article, we focused on the gear used with full-battened mainsails, which were becoming increasingly popular among a broad spectrum of sailboat owners then.
Top Whipping Twines
The term whipping twine is somewhat misleading, suggesting a single purpose for a product with seemingly endless uses. These are the thin-woven strands that all hand-sewing projects depend upon, and in the process of exploring various stitching projects, weve gone through spools and spools of it.
Rope Clutches Tighten Their Grip
Like the character Jaws in the old James Bond movie, rope clutches grab hold with a ferocious bite. This month we take another look at these toothy devices and how changes in materials and design are reshaping the art of clamping down. Since our last test (see Practical Sailor March 2009 online), several manufacturers have improved their existing designs to grip better than ever. Others have unveiled completely new approaches.
Higher Loads Call for Careful Installation
Rope clutches are a great innovation that can help sailors better control the lines that lead aft to the cockpit and those that cluster around the mast base. But as with many good things, there is the risk of over-doing the benefit.
Stitching Instead of Splicing
Splicing is king in any discussion of line termination. By carefully tucking cover and core back into the line, or weaving strands in laid line, and using patterns that have been perfected over time, we can create virtually full-strength terminations that will last the life of the line without maintenance.
Break and Break Again
All lines were broken once to determine approximate breaking strength without a stitched eye. A simple chain fall and load cell provided a means of pulling test samples up to 5,000-pound loads. The samples were then sewn or knotted into dog bones 6 to 8 inches long with an eye on each end, and the load was again applied until failure. This allowed the testers to compare breaking strengths with and without a stitched eye or knot. The test was broken into two parts, laboratory and field testing.
Other Stitching Techniques that Work Well
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 the accompanying main article. Here are some of the other stitching patterns we tested.
Mainsail Halyard Shackles
A mainsail halyard shackle needs to be as reliable as an on/off switch on a table saw. Its a one-act pony thats counted on to perform perfectly each and every time. These essential shackles fly under the radar and have become so much a part of every sailors routine that they are simply taken for granted. They terminate mainsail, mizzen, and foresail halyards aboard sailboats ranging from dinghies to mega yachts. We become so familiar with the hardware, that idiosyncrasies like a slightly bent clevis pins, damaged threads, or a misshapen stamped fork opening are tolerated.
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The Irwin 34 is in many respects a typical Irwin boat. It was originally called the "Citation 34," which was meant to indicate that it was more of a plush cruiser than the race-oriented Irwins at the time, but more of a racer than the larger cruisers. According to the company, 305 Irwin 34s were built in the production run, from 1978 to 1985, a moderate but successful model for the era. Near the end of its production, the boat was advertised as the Irwin 34 rather than the Citation 34. There were no major changes in the boat from beginning to end, just the details and equipment that are typical of any long production run.