Werner Stengel including Son of Beast, Millennium Force, Superman The Ride, Top Thrill Dragster, Kingda Ka, Dollywood's Mystery Mine, El Toro, Maverick and many others. In the 2004 Amusement Today Golden Ticket Awards list of the world's top 50 steel roller coasters, 72% have had direct involvement with Stengel Engineering. He received an honorary doctorate from Gothenburg University in 2005, for his "inexhaustible creativity in linking physics and design to the experience of the body in roller coasters and other rides." One of the most famous and highly regarded Stengel/Schwarzkopf rides is Lisebergbanan at Liseberg, a park situated in Gothenburg city, Sweden.
Kingda Ka brake fins in the launch section keep fast-moving trains from returning all the way back to the station during failed attempts to complete the tophat element. The incident caused an unexpected stress on a number of fins, bending them forward. Not all required replacement, but there were more damaged brake fins than Six Flags had replacements for. Extra brake fins had to be ordered from the manufacturer, Intamin in Switzerland, and the ride had to undergo thorough testing following the repair. Kingda Ka reopened on August 4. Kingda Ka was struck by lightning in May 2009 and suffered serious damage.