I just saw them described as foils in a couple of different articles, so no first hand knowledge...

"Yellow Pages Endeavour (YPE) is a Lindsay Cunningham tri-pod design. YPE could loosely be described as a proa, because it sails only on starboard tack.It rides on three hulls or pods located at the ends of three wing-like arms. The vertical wing mast is mounted on the hub where the arms meet, and is stayed by wires. The craft has eight or nine foils under the pods - three on the forward pod, three on the aft, and two or three on the crew pod. The three forward foils rotate to steer the craft."

The picture I saw showed small foils, like a T foil but oval shaped...