Troublesome electromagnetic catapults look set to be replaced with old-fashioned technology
President Trump has ordered the US Navy to draw up plans to replace electromagnetic aircraft catapults and weapons elevators with old-fashioned steam and hydraulic systems.America’s commander-in-chief issued a presidential memorandum directing the secretary of defense, in consultation with the secretary of the Navy, to come up with a plan to replace the Electromagnetic Aircraft Launch System (EMALS) on the future USS Doris Miller (CVN-81) with the older steam-powered system.The same note stipulated the replacement of the electromagnetic Advanced Weapons Elevators with the hydraulic versions used in older carriers.
These directives were part of a broader memorandum aimed at shaking up shipbuilding for the US Navy, which is often seen as glacial and moribund.
EMALS was introduced on the USS Gerald R Ford (CVN-78), which was the first of an improved design of US aircraft carriers. It basically uses a linear induction motor to accelerate an aircraft along the flight deck, in place of the old-fashioned system that employs a steam piston.The premise of EMALS is that it doesn’t require a head of steam, and as it is electromagnetic, it should be easy to adjust the power to match the size and weight of aircraft being launched. However, the technology has had a few teething problems, as reported by The Register previously, and these have even led to the Gerald R Ford being unable to launch aircraft at all.The Advanced Weapons Elevators, which also use linear motors, have likewise proven problematic.Earlier this year, it was reported that there was a study underway to review the Ford-class carrier design and determine whether it should be altered for the next two in the class.“We are looking at 82 and 83 to review the costs, the designs, the systems, to make sure that they make sense, and they have all the systems and requirements that we want going forward,” then-secretary of the Navy John Phelan is quoted as saying.One of the concerns was said to be with the sortie generation rate of the Gerald R Ford – the number of takeoffs possible - which was promised to be higher with EMALS.We asked the White House if this directive would apply to all subsequent US carriers, but a spokesperson simply referred us to the announcement, which mentions only CVN-81.
