WHILE AT THE NATIONAL CORVETTE MUSEUM MOTORSPORTS PARK IN BOWLING GREEN, KY, I WAS DRIVING THE ROAD COURSE, COMING DOWN THE STRAIGHT AWAY (BEFORE CORNER 15), WHEN I FELT MY CAR "JERK HARD" TO THE RIGHT CAUSING MY VEHICLE TO SPIN OUT OF CONTROL AND SLAM INTO THE GUARDRAIL. THE BACK RIGHT TIRE WAS TURNED IN AT 45 DEGREES AND CAR WAS UNDRIVEABLE. AT THE REPAIR SHOP IT HAS BEEN FOUND THAT THE RIGHT REAR KNUCKLE BROKE, WHICH IS WHAT CAUSED ME TO SPIN OUT OF CONTROL ALSO CAUSING THE ADDITIONAL DAMAGE CONSISTING OF REAR QUARTER PANEL REPLACEMENT, REAR BUMPER REPLACEMENT, AIR FOIL DAMAGE, BATTERY DAMAGE, FRONT AIR DAMAGE. *TR