In fact, the same software and technology being used to develop aircraft like Boeing's is what is making such dramatic heights, speeds, curves, and thrills possible on new roller coasters, Jim Seay, president of the roller coaster design firm Premier Rides, explains in an article for Popular Mechanics that roller coasters are able to reach extreme speeds and heights because of "new engineering tools, quicker computers and exotic materials." He adds that "high-tech materials like carbon-fiber composites opened the door to more sophisticated designs because they reduce weight and the resulting stresses on large support structures." This new technology affects everything from the shape and design of the roller coaster to the motors that power it. For example, computer-aided design allows engineering feats resulting in rides like Fahrenheit, in Pennsylvania, that propels riders down at a 97-degree angle. That is seven degrees past a vertical drop. New linear induction motors, which are designed to accelerate an object to a very high speed with magnetic waves, are used in a ride at Six Flags in the United States. Riders reach speeds of 70 miles per hour in only 4 seconds.