Boat construction

Claim 1

IN COMBINATION WITH A BOAT HAVIN A BOTTOM AND A TRANSOM; A HYDROFOIL COMPRISING A VERTICALLY POSITIONED CENTER BOARD SECURED TO SAID BOTTOM AND EXTENDING DOWNWARDLY THEREFROM AND THROUGHOUT A MAJOR PORTION OF THE LENGTH OF THE BOTOM OF THE BOAT AND HAVING A LONGITUDINAL SLOT OPENING TO THE REAR NEAR THE TOP THEREOF, SAID CENTER BOARD SLOPING DOWNWARDLY AND REARWARDLY ALONG ITS FORWARD EDGE AND HAVING A SUBSTANTIALLY VERTICAL REAR EDGE IN SUBSTANTIAL ALIGNMENT WITH SAID TRANSOM, A PLURALITY OF HORIZONTALLY POSITIONED VANES LONGITUDINALLY ARRANGED WITH RESPECT TO SAID CENTER BOARD AND EXTENDING REARWARDLY FROM THE FORWARD EDGE OF SAID CENTER BOARD AND TERMINATING FORWARDLY OF THE REAR EDGE THEREOF, HORIZONTALLY POSITIONED STABILIZERS DISPOSED ON EACH SIDE OF SAID CENTER BOARD ALONG THE BOTTOM NEAR THE REAR EDGE AND HAVING SMALL VERTICAL STABILIZER MEMBERS EXTENDING UPWARDLY FROM THE TIPS THEREOF, ELEVATOR FLAPS PIVOTALLY CONNECTED TO THE REAR EDGE OF SAID STABILIZERS, OPERATING LEVERS IN SAID BOAT, AND LINKAGE EXTENDING THROUGH SAID SLOT AND CONNECTING SAID OPERATING LEVERS WITH THE RESPECTIVE ELEVATOR FLAPS.