The Peter Pan is the original old design. The Swordsman is the same old hull but with a flex or wire drive which will be more stable, but not quite as fast on flat water. The Evo with its anti submarine wedge, deeper V, and more rounded deck looks like it is the one for rougher water. The Volador looks like the peter pan and swordsman hull but without the steps on the wings, I don't know of a disadvantage to having them, but they were contriversial when the first ECOs with them came out as the rules say ECOs can't be stepped, so maybe they are to fit in with the rules of a club or organisation that disallowed them.
Or that might all be BS, the pics aren't great and while I have raced one and seen quite a few, I am not an ECO Expert.
Paul Upton-Taylor, Greased Weasel Racing.
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