[Tom3]

I think that evaluating a keel based on its ability to cope with a major screw up like leaving a keelboat in a slip that has no water at low tide is the wrong way to go about it.

If you really want a keel that holds up when the water is gone there are double keel boats built for just that purpose.

As to what happens to a wing or a fin when you ground (for what ever reason) there are a lot of variables. What speed are you planning to hit the ground at? will the ground be mud, rock or sand?

What is the keel made of? How heavy is the boat?

I''m not trying to bust your chops, I am trying to make the point that its not a simple question.