CREATE TABLE table_73805 ("Position" FLOAT, "Sail number" TEXT, "Yacht" TEXT, "State/country" TEXT, "Yacht type" TEXT, "LOA  ( Metres ) " TEXT, "Skipper" TEXT, "Corrected time d:hh:mm:ss" TEXT)

What is the number of the sail with an overall length of 13.68?
SELECT "Sail number" FROM table_73805 WHERE "LOA (Metres)" = '13.68'
SELECT "Sail number" FROM "table_73805" WHERE "LOA (Metres)" = '13.68'