So as things would happen, there I was walking along the beach by the Club Natació Barcelona on Tuesday when I chanced (as one does) on these beasts. They are, as Mary said Patin a Vela. No rudders, no boards, no boom, no battens, no trapeze. All wood (including the fives beams), they look quite long, maybe 18 or 20 feet but are much narrower than you'd expect from a conventional cat. The mast is aluminium and doesn't appear to rotate. It has three sets of shrouds/stays - the middle ones are fixed but the others are adjustable on the water. The mast is very bendy, the mainsheet is only 3:1 but the helmsman can bend the mast by a huge amount. They do have a travelled but no way on controlling where the mainsheet is on it - so it's always down to leeward. The day I watched them was very light. Whilst the better sailors had no problems, the poorer guys were struggling a bit, quite a few blown tacks and a few accidental ones where gusts came through!