Symmetrical sailboat with moment balancing rig

A sailboat apparatus for sailing on water comprising:

• a hull which is substantially symmetrical fore to aft and laterally, said hull having an upper surface and a lower surface;
• a mast attached to said hull, said mast having a major long axis;
• a sail rotatably attached to said mast so that said sail can substantially fully rotate around said mast, said sail having at least three corners;
• a substantially rigid frame attached to said at least three corners of said sail;
• pivot means attached to said frame and to said mast to permit said sail to rotate about an axis that is substantially perpendicular to the major axis of said mast;
• a boom attached to said mast on a side opposite said sail;
• and,
• balancing means attached to said boom, mast and sail for changing the angle of said boom with respect to said mast as the angle of said sail changes with respect to said mast,
• wherein the rotation of said sail around said mast permits said sailboat apparatus to shunt when sailing upwind.

A sailboat apparatus for sailing on water comprising:

• a hull which is substantially symmetrical fore to aft and laterally, said hull having an upper surface and a lower surface;
• a mast attached to said hull;
• a sail rotatably attached to said mast so that said sail can substantially fully rotate about said mast;
• a boom attached to said mast on a side opposite said sail;
• a seat attached to said boom for supporting a sailor;
• and,
• balancing means attached to boom, mast and sail for changing the angle of said boom with respect to said mast as the angle of said sail changes with respect to said mast.

A sailboat apparatus for sailing on water comprising:

• a hull which is substantially symmetrical fore to aft and laterally, said hull having an upper surface and a lower surface;
• a mast attached to said hull, said mast having a major long axis;
• a sail attached to said mast, said sail having at least three corners;
• a substantially rigid frame attached to said at least three corners of said sail;
• pivot means attached to said frame and to said mast to permit said sail to rotate about an axis that is substantially perpendicular to the major axis of said mast;
• a boom attached to said mast on a side opposite from said sail;
• and,
• linkage means connecting said boom to said sail frame for constraining the angle between said boom and said mast to a predetermined function of the angle between said sail frame and said mast, said predetermined function being such that the net heeling moment remains substantially zero with changes in wind force.