It finally came to me. I think the name of the Roque 16-footer(or maybe 18?) that raced at Sailfest was Planecat.
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By the way, another planing cat that Randy sailed in the Worrell 1000 was a Holder design. Didn't sail it very long, though, because the mast broke right after the start of the first leg. He replaced the mast with a Supercat tall-rig mast, and then the beam broke right after he started off again. That was a beautiful boat, and I am wondering if that is the one that somebody said is still sailing in the Miami area.

The Roque boat that Randy sailed in one of the Worrells looked like it was upside down on the beach and as though somebody had mounted the mast on the bottom instead of the top. As I recall, he won the race with that boat, but it was not a comfortable ride. Also -- and, again, this is distant recall, because it was more than 15 years ago -- I think that boat capsized on the first or second leg of the race and he and crew were not able to right it until they finally drifted almost to shore and were in shallow enough water to stand up.

The reason those planing-hull boats were designed for the Worrell 1000 is because it had traditionally been primarily a downwind race, which would be more favorable to a planing hull.

I wish more attempts would be made to develop a catamaran that planes. I think one of the problems has been the difficulty of making such a boat both light enough and strong enough with a flatter profile. (That probably explains Roque's upside-down-boat design.)

I have always had this weird theory that a Shark catamaran could plane if the boat could be made light enough. But same problem -- fat hulls need more interior reinforcement and probably stronger crossbeams, all of which adds too much weight.

In the ideal world, if you had two cats of identical size, with identical sail area and identical weight, which would be faster, the displacement cat or the planing cat? It is a question that has nagged me for many years.