This is an interesting question, since there seems to be 0 consensus. When I replaced the transducer on my H36 the hull seemed to be solid glass, however other people swear blind it's cored with close-cell foam!
I am wondering if it may have varied from hull to hull? Mine is #65, can other owners weigh in here?
I am wondering if it may have varied from hull to hull? Mine is #65, can other owners weigh in here?