Sailboat hull

Claim 1

A SAILBOAT HULL COMPRISING AN ELONGATED BOTTOM AND AN UPWARDLY PROJECTING TRANSOM AT THE STERN END OF SAID BOTTOM, SAID BOTTOM AND TRANSOM HAVING AN UPPER MARGINAL EDGE DEFINING A DECK LINE, SAID BOTTOM HAVING A CROSS-SECTIONALLY DOWNWARDLOY FACING CONCAVE CENTRAL PORTION EXTENDING SUBSTANTIALLY THE FULL LENGTH OF THE HULL, SAID BOTTOM INCLUDING BOTTOM SIDE PORTIONS CURVING LATERALLY OUTWARDLY AND UPWARDLY FROM OPPOSITE SIDES OF SAID CENTRAL BOTTOM PORTION TO SAID DECK LINE, SAID BOTTOM DEFINING A PAIR OF KEEL LINES DISPOSED IN LATERALLY SPACED RELATION FOR SUBSTANTIALLY THE FULL LENGTH OF THE HULL, EACH OF SAID KEEL LINES FOR SUBSTANTIALLY THE FULL LENGTH OF THAT PORTION OF THE HULL BELOW ITS NORMAL LOAD WATER LINE BEING DISPOSED IN A DIFFERENT ONE OF A PAIR OF PLANES, EACH PLANE EXTENDING IN A DIRECTION SUBSTANTIALLY PARALLEL TO THE LONGITUDINAL DIMENSION OF THE HULL AND EACH PLANE BEING ANGULARLY DISPLACED FROM THE VERTICAL AND SLOPING UPWARDLY AND INWARDLY TOWARD THE PLANE OF THE OPPOSITE KEEL LINE, SAID KEEL LINES BEING CURVED GENERALLY UPWARDLY IN THEIR RESPECTIVE PLANES FROM THE LONGITUDINAL CENTRAL PORTIONS OF SAID KEEL LINES TOWARD THE OPPOSITE ENDS THEREOF, WHEREBY VERTICAL PROJECTIONS OF SAID KEEL LINES ARE BOWED IN DIRECTIONS IN WHICH SAID KEEL LINES ARE SPACED APART A GREATER DISTANCE AT THE LONGITUDINALLY CENTRAL PORTIONS OF SAID KEEL LINES THAN AT THE OPPOSITE ENDS THEREOF AND HORIZONTAL PROJECTIONS OF SAID KEEL LINES CURVE UPWARDLY FROM THE LONGITUDINALLY CENTRAL PORTIONS OF SAID KEEL LINES TOWRAD THE OPPOSITE ENDS THEREOF, SAID CONCAVE CENTRAL BOTTOM PORTIONS AT THE LONGITUDINALLY CENTRAL PORTION THEREOF BEING DISPOSED BELOW THE NORMAL LOAD WATER LINE OF THE HULL WHEN THE HULL IS LEVEL FROM SIDE TO SIDE, SAID CONCAVE CENTRAL PORTION AND SAID KEEL LINES FORWARDLY OF THE LONGITUDINALLY CENTRAL PORTIONS THEREOF CURVING UPWARDLY ABOVE THE NORMAL LOAD WATER LINE OF THE HULL AT THE BOW END THEREOF, SAID CONCAVE CENTRAL BOTTOM PORTION AND SAID KEEL LINES REARWARDLY OF THE LONGITUDINALLY CENTRAL PORTIONS THEREOF CURVING GENERALLY UPWARDLY TOWARD SAID TRANSSOM, SAID CONCAVE CENTRAL BOTTOM PORTION BEING A SMOOTH AND CONTINUOUS UNINTERRUPTED CONCAVE CURVED SURFACE FOR SUBSTANTIALLY THE FULL LENGTH OF THE HULL BETWEEN SAID KEEL LINES, THE DEPTH OF THE CONCAVITY OF THE CENTRAL BOTTOM PORTION GRADUALLY DIMINISHING ADJACENT THE STERN PORTION OF THE HULL TO DEFINE A GENERALLY FLAT PLANING SURFACE, THE ARRANGEMENT BEING SUCH THAT, WHEN THE HULL IS TILTED LATERALLY IN A GIVEN DIRECTION TO A PREDETERMINED DEGREE, ONE OF SAID KEEL LINES FOR SUBSTANTIALLY THE FULL LENGTH OF THAT PORTION OF THE HULL BELOW ITS NORMAL LOAD WATER LINE IS DISPOSED IN A VERTICAL PLANE SUBSTANTIALLY PARALLEL TO THE LONGITUDINAL DIMENSION OF THE HULL.