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Looking for info on the fiberglass bottom of my 1968 20' Corsair Sea V inboard (and Sea Skiff, I presume). I'm considering installing a new, in-hull transducer for a depth sounder, but wanted to be sure the bottom of the hull is not "cored." I.e., presumably, it's solid fiberglass and not filled with either wood or foam. In-hull transducers don't function well -- or at all -- in cored bottoms.
I found somewhat to my surprise and disappointment that the transom of the Corsair Sea V 20' is a sheet of plywood sandwiched between two layers of fiberglass. I am hopeful -- and would expect -- that the hull bottom is solid 'glass. True?