The foils that control Macquarie Innovation are tiny by comparison to the large dimensions of the craft. They are asymmetric foils with a total span of approx 270mm.The foils have been thoroughly tested using both computer simulation as well as flow tank testing at the Australian Maritime Engineering facility in Tasmania. With such high design speeds and relatively large loads carried by the foils (each of the four foils experiences the equivalent of an average adult male standing on the end of them), the possibility of experiencing cavitation is real. The section profile is deliberately aimed at delaying the onset of cavitation, thereby ensuring that control is maintained with minimum drag. Two anti-ventilation "fences" also appear on each foil to prevent the low suction pressures from dragging air from the surface down the side of the foil.