For some time now Peter Harburg’s Black Jack - the lightest of the super maxis racing to Hobart - has been touted as the one to watch, particularly if the race turns up some lighter air phases, as it frequently does. In this interview, recorded just after Black Jack’s win in the SOLAS Big Boat Challenge, skipper Mark Bradford explains the thinking behind the foil design for the boat, how it’s used and why it needed to be different from the foils aboard Black Jack’s near twin, Wild Oats XI.