HOW I T WORKS

During races Team USA’S grinders tuck into 17’ s hollow hulls to spin winches, which provide the hydraulic power to raise and lower the L-foils, shown above. Though 17 has two L-foils (one on each hull) it usually flies on only one, with the other raised into the boat to minimise drag. Rules state that both L-foils may be lowered on occasion for 30 seconds at a time, for stability in jibes and tacks.