INMAN — The captains tightened their grips and focused their eyes as their yachts cut across the water, nearly turning over while racing around the marks. Their sails vibrated as a breeze of up to 10 ...

Each pointed a boxy radio control at his own DragonFlite 95, a meter-long vessel with a pointy sail like a shark fin. Sometimes the boats rounded markers made from painted Clorox bottles. Other times, ...