The shape of the hulls are all the same, never changed over 25 or so years of serial production. That includes the dagger boards. The dagger board trunks went through a minor change in the early 1990’s where the trunk was incorporated into the main hull, molded as a single piece, rather than being a separate bonded part.
The hull construction and fiberglass layup is a different story. The hulls went through a lot of layup and manufacturing changes over the years. Early hulls were heavy and prone to delaminating. Mid 1980’s the hulls were lightened, but went too far and some hulls failed. Late 80’s early 90’s Hobie went the other way and put a lot of weight back into the hulls. Then they pulled some weight back out, but the later hulls were a good balance of weight and durability.
The deck is bonded to the hull with an expanding adhesive. In rare cases, they don’t get a perfect bond and it can let go. Sounds like that may be what happened to your boat. If that’s the case, you can flip the boat over, spread open the hull joint, clean out any loose material, and then re-bond with thickened epoxy (West six-10 is a good choice).
If the joint is intact but the hull failed (fiberglass cracked), then that is a more extensive repair that would require rebuilding the broken area of the hull.
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