Damage at rear end of keel
We hit a rock doing around 4 knots off Put-in-Bay two summers ago. The lead keel was dented, but there was no other visible damage, or leaking.The insurance paid for a haul-out, paint stripping, and inspection. The yard marveled at the nine keel bolts, one+ inch thick glass, and strong grid in the bottom of the hull. Basicly, the conservative 70's design makes the keel attachment nearly indestructable from a single keel strike on a Cherubini h27.There were three small (less than one inch in length) cracks radiating back from the back of the keel attachment area. They did not come from our strike. The bad news is that impact damage on a fiberglass structure is cumulative. These cracks originated in earlier strike(s), but probably grew longer and/or deeper from our strike. So we had them ground out (again insurance paid) and the area reglassed. This showed them to be less than 1/4 inch deep.I wouldn't worry about your strike. I would have the area behind the keel powerwashed to remove all paint at the next haul-out. If there are any cracks, I'd get a really good fiberglass guy to help in my decision what (if anything) to do.DavidLady Lillie