Welcome to the Cherubini Hunter family. Look up "Dianna of Burlington" posts on this site. He is John Cherubini Jr,, the co-designer and son of JC Cherubini Sr., designer of the Hunter line in the late sixties and seventies. He also is restoring (Re-designing) a H 25 C with posts on his own website and here on SBO.
I don't know of any fin-keeled boats for which the keel is not bolted on. At Cherubini we poured lead into the raw fiberglass of the hull; but that was due to many factors including the shape of the boat and the many structural preparations we made to accept it. Internal lead has many benefits, not the least of which are an absence of potential leaks; but external lead is desirable for its getting the weight down lower. These ideas only work in full-keeled boats.
A fully-lead fin keel represents a kind of waste, as it's the same material from top to bottom; so where is the weight concentrated? --too high. One solution is the bulbed keel. The winged keel is nothing more than an exercise in modifying a bulbed keel. Olin Stephens was very adamant about the inappropriateness of winged keels on general-purpose cruising boats. It's like the 'sled' design currently so popular, giving way to the grossly-mistaken belief that it makes for a better-sailing boat. The real reason for the 'sled' (flat-iron) shape is to accommodate two queen-sized quarter berths in separate cabins; and anyone insisting a sugar-scoop transom and 'wave-piercing' bow are seaworthy is probably more influenced by marketing hype than by technological information and actual sailing experience. But (as usual), I digress.
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