It doesn’t look fast or easy, but it most definitely is a wing and it most definitely is on a Sunfish! Designer (and famous basketball shoe) Chuck Taylor is even selling kits and parts to make ‘em yourself, though we’re still waiting on some proof of his claim that the X-Wing is faster than a conventionally rigged boat.
The X-Wing project started with a few computer-designed sketches of a small wing sail, with no idea at that time how it would be constructed. After almost two years of building and testing four different designs using different construction methods a practical and lightweight design emerged. Although the design is centered around the Sunfish sailboat it is readily adaptable to other freestanding mast sailboats.
Abomination or fun project? You decide. And thanks to Anarchist “Stuff4Toys” for the heads up