Re: SWING KEELS GOOD or BAD?
There are three things here:
Swing keel: Outside the hull, no centerboard trunk in cabin, heavy and gets the weight lower that the others, draft when up is the width of the keel. Very common on trailersailers like Catalina 22.
Centerboard: Weighs less, not significant in stability, has nothing below hull when it's up, easier to trailer launch and can go into shallow water. Common on dinghys and smaller boats also sharpie type boats. Trunk in the cabin takes space, trunk can be fouled with stones when beaching.
Keel centerboard: Has keel like stability, shallower than a full keel, draft is usually greater than a swing keel. No CB trunk. More common in the larger trailersailers like Catalina 25.