We keep Moonspinner on a drying mooring in the River Blackwater where the bottom is a mixture of soft and not so soft mud over an underlying strata of gravel/ballast. She does heel a bit when dried out but the ammount of heel depends on whether she settles in a soft spot or on a harder patch. Heeling is limited and the worst I have seen is about 25 degrees. I saw the report on the boat that sank after the keel land was holed by (probably) a stone and when we lift her out at the end of this (our first) season, i'll check very carefully and if necessary clean back the keel land area under at the bottom of the hull and apply a few layers of glass tape in epoxy or polyester resin just to make sure that she is able to withstand the repeated grounding action. Whilst our moorings appear relatively exposed at half tide and higher, when the water recedes and the depth reduces, there is hardly any significant vertical movement and thus no pounding of plate on hull.... (hopefully). Also, as is characteristic of our moorings (apart fron the few on gravel banks), boats tend to dig themselves a hole, or rather a crescent shaped soft-spot around their mooring after a month or two resulting less apparent heeling than at the start of the season.
I would suggest similarly just keep an eye on things during the season and check carefully and beef-up the keel land if necessary over winter. You could also fit a float switch to an electric bilge pump as a backup - as long as your battery(s) are up to it and/or if you have solar or wind recharging set up....
Greg
Seal 22 Moonspinner
Greg...
Greg...
Seal 22 - Moonspinner