1.   Davis shipped the battered hull back to Rhode Island, where inquiries over the missing ballast bulb turned heartbreak into blame.

2.   He had also run the yacht aground several times, immersing the all-important ballast bulb in mucky sea bottoms before leaving on his voyage.

3.   Koch has admitted to changing its keel, rudder, ballast bulb and winged appendages in December.

4.   Most of the weight is in a lead ballast bulb at the base of the keel.

5.   The programs simulate the fluid flow around hulls and appendages, like rudders, keels and ballast bulbs, or the movement of air around masts or sails.