Read only if you give up?
Timm,Although it may not look it, the object in the picture is a boat. Not only is it a boat, it's one of the most ancient and efficient boat designs ever produced. In spite of its awkward appearance, that boat can out-sail almost any cruiser. The secret is in its long, thin main hull (top) that carries 75% - 100% of the weight (depending on wind and sail) and a shorter, lighter windward hull (I'll explain the "windward" part later) that acts as a counter balance. The mast is mounted inboard of the main hull so the shrouds form a 3 sided pyramid. Spreaders aren't needed because the chainplates are so far from the mast.The wetted hull parts are long and thin so as to reduce bow waves. The hull speed is not limited by length. The cabin design, on the other hand, has little to do with the shape of the hull. The cabin can provide adequate living arrangements while offering minimum windage from an abeam wind. Since the main cabin area is always on the lee side ("lee" explanation coming too), the cabin can be wedge or pie shaped with the largest volume on the lee side. The extra cabin overhang on the lee side provides reserve buoyancy to prevent the boat from tipping all the way over in a gust.Now for the windward/lee part. This design always sails with the small hull (bottom of picture) to windward. Instead of tacking, it does a maneuver called shunting in which the boat stops and then heads off in the opposite direction. The bow becomes stern and vise-versa. Because this boat points so close to the wind, shunting is not done as often as tacking so it's no big deal. The AeroRig (main and jib on same 360 degree rotating boom) is perfect for this arrangement.http://www.harryproa.com/shuntinganimated.htmIf you still haven't guessed, the boat in the picture is a “proa”. The picture comes from a German website (related link). More pictures are in the "Fotos der Segelyacht" section. (Don’t ask me, I don’t read German.)Happy (fusion powered) sails *_/),MArk