The traditional sail used on the proa was the crab-claw sail, which generates far more lift than the more common triangular sloop rig used on small boats, particularly when reaching.
The traditional sail used on the proa was the crab-claw sail. Claw sail generates far more lift than the more common triangular sloop rig when reaching. This is particularly. This more common triangular sloop rig is used on small boats.