Future
The size and manpower requirements of steam catapults place limits on their capabilities. A newer approach is the Electromagnetic Aircraft Launch System (EMALS). Electromagnetic catapults place less stress on the aircraft and offer more control during the launch by allowing gradual and continual acceleration. Electromagnetic catapults are also anticipated to require significantly less maintenance through the use of solid state components.
Linear induction motors have been experimented with before, such as Westinghouse's Electropult system in 1945. However at the beginning of the 21st century, navies again started experimenting with catapults powered by linear induction motors and electromagnets. EMALs would be more energy efficient on nuclear powered aircraft carriers and would alleviate some of the dangers posed by using pressurized steam. On gas-turbine powered ships, an electromagnetic catapult would eliminate the need for a separate steam boiler for generating catapult steam. The U.S. Navy's upcoming Gerald R. Ford class carrier includes electromagnetic catapults in its design.
Read more about this topic: Aircraft Catapult
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