I'm with Mawill - get a boat and go to a beaten up 1977 boat. It can beat most of the recent world Masters champs. Downwind speed is actually quicker than the brand-new boat. Upwind speed was simply stupid.
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Apologies, I should have said "most of the recent Masters world champs that the boat has raced against. That's 3 or 4 of them.
The downwind speed improvement was largely because I finally learned how to sheet properly on the runs, but some surmise that the old and worn mast tube may have allowed the rig to lean forward more.
Point is, the old boats can be quite competitive.