catamarans used to have a kevlar shoe on their keels. I know that our Privilege
39 has the kevlar shoes, and when we have grounded the hull
unintentionally, we have never suffered any damage.
I also know of a South African cat that sailed in the shallow waters of mobile bay, and they put a stainless steel shoe on their keels. It was a 48 foot cat that performed well, and they liked having the stainless steel shoe as an insurance
policy for their fast shallow water
I would think that a person could put a couple of layers of kevlar on their keels the next time they haul out
. It would increase the abrasion resistance of their keels and could make a difference in less serious groundings or during routine beaching of the yacht.
At our boatyard, I saw a large Prout Catamaran
that had part of the keels ripped off from a hard grounding, but because of the watertight compartments in the keels, no water entered the interior
of the yacht. I was impressed by the design because the yard manager told me that this is the second time the owners ripped the bottom of the keels open, and he said that the yacht had travelled more than 500 miles in that condition since the last and most serious grounding.
bulkheads and keel
design are high on my list of important things to have on a cruising yacht.