Madison, Indiana's Oh Boy! Oberto won the 2012 H1 Unlimited National Championship with a clean sweep in Thursday and Friday's preliminary heats. Heat 4B was stopped today when the Spirit of Qatar 96 caught fire. Driver Dave Villwock was unhurt in the fire. The Oryx Cup U.I.M World Championship will be run tomorrow, with the schedule TBA. The Unlimiteds will remain in Doha for a February race to start the 2013 season.