Nyack Boat Club is on the Hudson River and the anchorage is unprotected. In a north east blow this is seven miles of fetch. From the east there is about 2 miles.
In the fall during a Nor'easter we would usually lose a boat or two. We seemed to accept this as "normal". However after hurricane Sandy and losing 25% of the boats in our mooring field, our boat club did extensive research and consultation with other marinas and clubs as well as hardware manufacturers. The results of the study yielded these recommendations. http://www.nyackboatclub.org/content/nbc-mooring-tackle-minimum-recommendations-07242013-1041 . Since Sandy, we have only had one boat break free. The chocks on my c&c 34/36 are too small for one inch line, so I opted for a slightly different setup. The primary pendant is 3/4" Polydyne. The lazy pendant is 1" polydyne with a 1/2" spectra pendant from the pendant through the chock to the cleat. The lazy pendant combo is about 2" longer than the primary pendant. All the pendants were pre-spliced with chafe guard on them. The pendants are low stretch and the catenary of the heavy chain absorbs the shock loading. My boat has ridden out a few storms with 30kt sustained for more than 24 hours and gusts up to 50k with 3-4' + waves. So if you can get fair leads from your existing chocks to a cleat(s), there are options to use relatively small line. Eric 34/36+ On Sat, Mar 14, 2015 at 6:42 PM, Eric Cahn via CnC-List < cnc-list@cnc-list.com> wrote: > {{{>You want to size mooring lines so there is some give, just like an > anchor > > line. Bigger is not necessarily better. > > > > In a large storm, stagger maybe 5 lines of different length so that one > > takes over as another breaks. They will break in big storms. > > > > I never saw a mooring cleat pull out. Lines always went first. A main > > culprit was an unusually large wave that would pull the bow up and snap a > > perfectly good, protected line. Make the lines as long as they can be in > a > > storm. > > > > I was on a helix mooring. The anchors always held, but a weak point was > > the line from the helix to the mooring. They need to be replaced every > few > > years or after particularly bad storms like hurricanes.}}} > > What about using line snubbers for the main pennants and a safety backup > set to the maximum stretch of the snubber. This seems it would help the > shock loads on the pennants AND on the mooring line. Perhaps even run a > couple of snubbers in series to really reduce shock. Just an idea. Could > it work? > > _______________________________________________ > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go to the > bottom of page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > >
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