the perfect 20'''' cruising boat?
You are right about gravity, of course. I experienced the problem with a swing keel that could not be locked down when sailing a Venture out in the Atlantic and the boat was rolled so fast and so far that the board came up and damaged the trunk. Only a quick mainsail release saved our fannies. When I raced on San Juan 21''s we would retract the keel on a run. That was pretty much standard fair in the 1970''s.