The Caballitos de Tatora is an ancient Peruvian fishing and surfing boat. The hull is constructed out of thousands reeds tied together. The reeds are bundled and form a round bow. The front end is bent to give, extreme nose rocker. Unlike a flat surfboard or toboggan (featured below), the hull will ride through a shallow pearl. The Caballitos de Tatora is extremely difficult to control, but; the round bow pushes water aside and keeps moving.
Nose rocker must be balanced. Too little nose rocker, will cause the tip to submerge. Too much nose rocker, will cause a flat bow to stop the board. A toboggan is built with extreme forward lift and a flat bottom. The front actually curls back in a loop. You would not expect it to catch like a pearl. The flat bottom actually slows the board. In this phase, the flat bottom is not the fastest design.