My favorite Roller coaster :) - I love this rollercoaster called 'Kingda Ka' in Six Flags,NJ.Along its 950 meter (3118 ft) length those brave enough to attempt Kingda Ka are first accelerated to a speed of 206 kms/hour (128 mph) before being launched 139 meters (456 ft) vertically into the air, plummeting 127 meters (418 feet) earthwards again in a 280 degree spiral, whooshing up and down over a 39 meter (129 foot) hill and eventually gliding to a halt at the coaster's end terminus.