Hi,

know of a good example of a wing keel version for sail, owner has just bought a new boat. It sails really well and eats up the rough weather no problem. As far as I'm aware they are also supposed to be unsinkable, this may be a safety feature in itself, is insulation in colder climates with no drips apparent another advantage!?!

See YBW.com, sure he is open to a sensible offer.

Good luck.