this type of launch track can be used for launching the train, as the catch car must be stopped after it disengages from the train. This type of propulsion is capable of catapulting a train to very high speeds, yet is only used mostly by Intamin, S&S Sansei, and less abundantly used by Vekoma, in their Accelerator coasters, Air Launched coasters, and Motorbike coasters, respectively. An example of an Intamin manufactured launch system is the Formula Rossa in Abu Dhabi, which accelerates the coaster train to its top speed of 240 km/h (150 mph) in approximately 5 seconds. Friction Wheel A friction wheel launch consists of a series of high speed drive tires used in succession to propel the train forward. An example of a friction wheel launch is the Incredible Hulk Coaster at Universal's Islands of Adventure. Flywheel Many shuttle loop roller coasters have a flywheel launch mechanism. Rotational energy is stored in the flywheel, which then catches on a cable attached to the train. The flywheel releases its energy to propel the train forward. Counterweight Counterweight launch mechanisms are used on some shuttle loops. The trains are launched by dropping a large counterweight attached to a cable. The cable then drives the train forward. Cable Disneyland Paris' Space Mountain uses this system. The train arrives at an incline and stops and hooks on to the pulley/catapult. The train is then launched up the hill and the cable falls back to the bottom. References Roller coaster elements Roller coaster technology