What does the slogan on the electromagnetic ejection say?

The electromagnetic ejection has been on the ship, why is the electromagnetic gun in the foreseeable future?

The working principles of electromagnetic ejection and electromagnetic gun are basically the same. Although the research of electromagnetic gun started earlier, its progress obviously lags behind that of electromagnetic catapult. Electromagnetic catapult has been installed on the American CVN78 Ford-class aircraft carrier, but the DDG 1000 Zumwalt-class destroyer, which plans to install electromagnetic guns, canceled the installation of electromagnetic guns and changed to 155mm conventional naval guns. Why is there such a serious delay in the progress of electromagnetic guns? There are two main reasons for this result.

One of the reasons is that electromagnetic catapult is the most important equipment for an aircraft carrier to play its combat effectiveness, so electromagnetic catapult will receive "special treatment" in the development of an aircraft carrier. The success or failure of electromagnetic catapult's development will greatly affect the system design of the whole aircraft carrier, and electromagnetic catapult can also relax some performance indexes required in its own design. The position of electromagnetic gun in the whole system is not so prominent, and there are not many performance advantages compared with conventional guns, which increases the difficulty of research and development of electromagnetic gun to some extent.

Another reason is that in engineering design, electromagnetic guns have also encountered many serious difficulties. Although electric energy is used to convert mechanical energy, the instantaneous power of the electromagnetic gun is much larger than that of electromagnetic catapult, even though the total power of the electromagnetic gun is smaller than that of the catapult, because the muzzle velocity is high. Compared with ordinary artillery, a medium-caliber artillery consumes only a few kilograms of propellant, but its instantaneous power can reach the level of large thermal power plants. For a long time, the electronic industry could not provide power devices with such huge instantaneous power, so the development of electromagnetic guns was seriously limited. It was not until the new century that the perfection of superconducting technology and supercapacitors brought a glimmer of light to electromagnetic guns. In addition, the ultra-high acceleration makes the accelerating electrode of the electromagnetic gun ablate very seriously.