Famed Florida daredevil Nik Wallenda will perform one of his most unusual stunts to date: he’ll walk, untethered, atop the new, 400-foot-high Orlando Eye Ferris wheel. Wallenda is scheduled to walk the six-inch, curved outer rim Wednesday morning. The walk will be broadcast live on NBC’s “Today.” The walk could take 3 to 5 minutes and Wallenda said he must avoid parts of the observation wheel as it rotates. Wallenda is married with three children and doesn’t take his events lightly. He prays, thinks about death and practices rigorously while coldly calculating risks. The 36-year-old Sarasota resident is known for walking tightropes across Niagara Falls, the Grand Canyon and between Chicago skyscrapers.