"when a boat hits a rock it is more likely to be holed if the hull is cored than if it is solid glass, assuming the two hulls were built to the same stiffness specification."
A cored hull built to the same stiffness would barely have any glass at all.
Most cruising cored boats will have about the same layup weather cored or not.
If 1/2 inch thick in single skin a layer of 1/4 on the outside and almost the same inside is used.
There will usually be a bit less glass on the inside as surfacing tissue outside to stop print thru is not usually inside
Better quality builders may use a layer of mat inside to make cleaning and painting easier.
Core is a general term that means nothing until you know what core material was chosen.
Some TT claim their house ply deck is a core , NOT!
The Navys of the world and the Pilot bot guys usually have the best standards ,
its their lives , but not their money.
Most specify AIREX as the foam core.
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