The round edges are what provide stability at high speed. The full-size boats have rounded edges to prevent sharp breaks as the boat's attitude changes relative to the wind. I used the same aerodynamics concept when I designed the UL-1 (the ORIGINAL UL-1 -- see it at BBY Racing), that was so inspirational when creating the LSH class) to provide stability. It was designed to handle rough water better than the other boats of the time, and proved its worth by winning several Nats championships.
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