There was a time, decades ago, when Frank Floyd could step outside his Corpus Christi surf shop, on South Padre Island Drive, and witness a water-sports revolution. “If you looked out for ten minutes, you’d see thirty cars go by with windsurfing gear,” says Floyd, who owns Wind and Wave Watersports. Amid the jumble of neon sails, masts, and wide boards sticking out of windows and strapped to rooftops, windsurfers pulled up to the beach and wiped away tears of joy. For they had scoured the sailboat racing circuit for the windiest coastal city in the United States, and they’d finally found their Shangri-la: Corpus Christi.To the layperson, Corpus Christi’s average wind speed of about 12 miles per hour may not sound impressive. After all,…