Is Hand-stitched, Nylon Webbing Strong Enough?
Rope is the mainstay of sailboat rigging, and knot-craft and splicing are the marks of a seaman. Sewn joins are also practical-and weve explored those in depth (see PS October 2014 online)-but there are times when flat webbing serves better; for example, reefing strops, jacklines and tethers, and straps for attaching sails and tackle to spars. But how do you form the loops required to attach them to hardware and other fittings?
Going Soft on Shackles
Fiber shackles have been in use for centuries-the simple knotted toggles provided all manner of service on square-riggers and even older craft. When made correctly with the right material, fiber shackles are strong, can be released without tools, and are jam-proof in the most severe weather. Like cotton sails, this 200-year-old technology has been updated through the use of modern materials.
The Mystery of the Bulging Fin Keel
I was reading a Mailport letter in the December 2014 issue of Practical Sailor, and it led me to your May 27, 2014 blog regarding keel failure. We have a 1977 Islander 28 with a bolted-on fin keel that is creating a safety issue. I am confident I know what the proper repair is (remove the keel and re-secure it), but I am more wondering if youve ever seen anything like this. On the starboard side of the keel, below the keel joint, a square chunk of lead is bulging out of the keel side. Ive had a few surveyors take a look at it, and theyve never seen anything like it either. The keel bolts do not leak-at least water doesn't come in. Thoughts?
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.
Sherardizing Alternative
In order to impart corrosion resistance to steel, the items are commonly galvanized, immersed in a bath of molten zinc. Hot-dip galvanizing is well established and accepted, but there are alternate technologies like sherardizing.
Armorgalv vs. Hot-Dipped
As part of our investigation into anchor chain and its attachments (see PS January 2015 and June 2014 online), we examined new galvanizing processes. Steel products that have clearly undergone an unconventional galvanizing process are making their way into the recreational marine market, but because these methods are proprietary, getting specifics about them is difficult. Industry insiders tell us that the galvanizing process is evolving-but few details are made public.
Does G70 Have Risk of Hydrogen Embrittlement?
Mention galvanized G70 chain in any discussion, and one of the first comments will be a question of the risks of hydrogen embrittlement. Though hydrogen embrittlement is very real, there have been no well-publicized cases of galvanized G70 anchor chain failure, nor cases of hydrogen embrittlement in new galvanized G70 anchor chain, and negative comment is apocryphal, in our opinion. Scare mongering at its best, or worst.
Galvanized Coatings Test
Corrosion attacks anchor chain long before it has reached the end of its useful life, and corrosion begins as soon the galvanized coating fails. Re-galvanizing can breathe new life into old chain, but it is not so simple or affordable as it used to be. As we saw in our most recent report on chain (see Practical Sailor June 2014 online), some of the high-tensile grades require specialized skills to galvanize, and others can't be galvanized at all. Even if galvanizing is an option, removing rusty old chain from the boat and delivering it to the galvanizer can make moving pianos seem like a cinch.
Estimating Galvanized Coating Thickness
There are no industry standards for how thick a galvanized coating should be on an anchor chain or mooring chain, and manufacturers don't publish this information. Fortunately, with a bit of sleuthwork, you can determine just how good the galvanized coating is on your chain by carrying out a couple of tests on some sample links you can obtain from your local chandler.
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.
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Latest Sailboat Reviews
Tartan 31 Piper: Used Boat Review
The Tartan 31 is one of the new line of performance cruising yachts from the venerable-and durable--Grand River, Ohio boatbuilder. In the last few years, Tartan Marine has come out with a range of new models, including the T-28, the 3500 and the 4600. A 41-footer is in the works. Both the 28 and the latest version of the 31 are part of the new Piper series, which are marketed in sailaway condition. Tartan has a reputation for solid construction and good workmanship and that's what the 31 is: solid and well put together. The hull is hand-laminated with alternating layers of chopped strand mat and unidirectional E glass. Behind the NPG/ISO gelcoat there's a layer of vinylester resin, which so far appears to provide the best osmotic blister protection available.
