The unlimited class winner last year (I believe, it could have been a year or 2 earlier) averaged 482 mph over the 6 lap race. I believe they fly about 450 feet AGL and are highly modified to obtain these speeds, but are at their limits. A failure at the speeds they fly of course can tax anybodies abilities. Jimmy Leeward could handle them with the best. My prayers to his family and all the people at the races who were injured physically and mentally by this horrific crash.