Originally Posted by davidpm
Last Monday night I was on a friends boat till after dark. On our way back he checked his phone and mentioned that a storm system was predicted for Tues.
The next morning I walked down to the beach and it already was too rough to get to the boat but the storm was predicted to hit hardest north of us.
That evening I again went to the beach and saw that the topping lift had let go but the boom was not banging around just setting on the deck. So far so good.
There was no way I could get to the boat in those conditions.
That evening about 10PM I got a call that the boat was on the beach.
I had it on a 500 lb mooring with 3/4" primary and 1/2" secondary chain and the heaviest pennants that would fit on the boat.
The pennants were not over the bow rollers but lead through the side openings that have little vertical rollers just for chafe.
I'm wondering how the bow roller casting broke?
The pennants had some chafe gear that just barely fit.
The pennants chafed through and the boat went on the beach.
What else could I have done other than move the boat to a more protected area.
The seas, according to the town harbormaster hit 10' and 50 knots.
Sorry for your loss. I have a few questions.
1- I would like to see a picture with the pendants stretched out and lined up with where it could have chafed?
2- Was the anchor on the bow?
3- Were there two pendants or more?
4- Are the pendants nylon?
Yes there is much you can do when a storm is coming to minimize the potential for chafe.
Multiple pendants. In normal conditions I have two but for storms I rig 4+
All pendants should be of unequal length
. This buys MORE TIME throughout the storm as the remaining pendants are brand new, unloaded and not chafed.
Pendants should not be led over "weak" bow appendages such as anchor rollers. Aluminum would qualify as a "weaker" appendage. A roller will help minimize chafe but it needed to be robust and "capture" the pendant so it can't hop out of it. Bungy cord can work well for retaining pendants in rollers.
Pendants in storms should be looooong!! Sharp angles over a chock create heat, heat melts nylon and the nylon parts. Long pendants mean a gentle angle over the chock and less heat built up. The pendants in the foreground will endure significantly more chafe and heat than the ones in the background.
Anchor need to be removed in storm conditions. They can slice through a pendant in short order and many boats I have seen ashore were actually caused by bow anchor chafe not chock chafe. This guy was VERY lucky he had two pendants because the ANCHOR snapped his first one.
Water permeable chafe protection is better than hose or non-water permeable chafe protection. It helps keep the pendants cool and helps to limit melting. Multiple layers have proven best for me alternating between polyester and cordura. I use three layers on each pendant cordura/polyester/polyester.
Polyester/polyester pendants survive significantly better to chafe and heat than do nylon pendants. Yale Cordage, the makers of the "Polydyne Pendants" have tested this extensively. They used to sell polyester/nylon, a vast improvement over nylon or nylon/nylon but recently switched to polyester/polyester for better durability under chafe and heat.
In storms that may get severe my FOURTH and longest pendant is attached to the boat with polyester/chain/polyester. The chain is about a 3' in length, just enough to get through the chock, then covered in multiple layers of chafe gear to protect the boat as much as possible. This is a LAST RESORT pendant. There are three others that can fail before this one gets used.
I rode out that same storm, though peak winds were slightly lower, and our pendants were nearly 35' long to the ball.
Captive chocks are far better than non-captive chocks at retaining pendants in storms. If your boat is not well suited or designed for "mooring" then some bow upgrades should be considered. Many builders think in terms of docks not moorings. This is our boat set up for a medium duty storm 35-45 knots so no chain pendant. The pedants were rigged for about 30' and all three of unequal length. Note the captive bow chocks and SS stem head. I do utilize our roller but the stem head is extremely robust.
HEAVY bottom chain, and I mean USCG bar between the link or the 10-20 pounds per foot stuff, help limit "shock loading". Our chain is 30' of USCG bottom chain and 25' of 3/4" top chain. I don't think we've ever snapped it tight. Even if we do the longer storm pendants help minimize any shock loading to deck gear. This is the chain for our "light weather mooring" for a 36' sloop. We also have a storm mooring where the boat was the night of your storm..