My boat is cored on the deck
and topsides (below the water
line is solid), and I am fussing over how to get some very strong attachment points. The design guide calls for 7,500 pounds.
. There are 2 large stern cleats
in solid glass, but they are not backed well enough. Because they are under a carpet liner and because of the corner they are in, it is not simple to add a big backing plate. Possible, though, by simply laying on more layers of glass. The cleats might have to be larger and changed to ss. Might not be able to repar the carpet, and it does not need replaced yet.
Chain plates on the sides. Accesible, but it is a cored section, so I would have some extra work there. Ugly too.
Carbon fiber chainplates. Accesible. I could place these a number of places. I eliminate corrosion
and leakage issues. They will be nearly invisable. A bit more work, but not bad.
I have made reacher attachment points using Kevlar before, for the same reasons; Kevlar honey comb hull
. They worked very well for over 15 years.
* Unidirectional CF sufficient to hold 12,000 pounds, perhaps. Will calculate.
* easy to spread the load over several square feet. I understand I can rely on ~ 600 pounds in shear for epoxy
secondary bonding, so though only 12.5 in2 are required, I will get much more. I imagine 1 layer of 3-6 oz glass cloth will cover the fiber for bonding and protection.
* Line hole with ss tube and washers, sized to fit ~3/8" ss shackle.
* Pin is horizontal, canted inwards to match bridle
angle. Shackle can swivel in verticle plane.
* Can be located in a transom posstion that is safer to reach (top step).
Your thoughts? Specifically, any experience in this application? It is certainly less demanding than a mast
chainplate in terms of stress and cycling.