Top Thrill Dragster
Most launched coasters built before Dragster utilized electricity and Linear Induction Motors or Linear Synchronous Motors to propel trains, but an electro-propulsive system would have required a much longer launch track than Dragster's hydraulic launch uses. The system employs 32 hydraulic pumps that power 32 hydraulic motors. Each grouping of 16 motors is attached to a planetary gear. The two planetary gears drive a massive drum. The steel launch cable winds around that huge drum multiple times. The drum spins up to about 500 revolutions per minute during a launch.
©2018 by Joel A. Rogers.