World’s first electromagnetic railgun
Japan’s railgun development formally began in 2016, with live-fire testing commencing in 2022.
Initial research prioritized two enduring technical challenges: projectile stability at hypersonic speeds and barrel wear mitigation.
Railguns use electric and magnetic fields to speed up projectiles, creating huge stresses on their internal parts.
This issue led to a halt in similar projects in the United States, which were eventually abandoned.
In contrast to the U.S. Navy’s abandoned railgun project, which ceased public development in 2021 after investing over $500 million, Japan’s program has remained publicly active.
According to Defense News, the American system suffered from severe barrel degradation after fewer than 30 firings.
While the classified continuity of the U.S. initiative remains speculative, Washington’s focus has publicly shifted to solid-state laser weapon systems, which have suffered from inconsistent field performance and limited operational readiness.
As mounted on Asuka, Japan’s current railgun prototype reportedly weighs eight metric tons and features a 6-meter-long barrel.
Open-source analysis, including Shephard Media reporting, suggests the system can launch 40mm steel projectiles weighing approximately 320 grams (0.7 pounds).
In tests conducted in 2018, the system achieved a muzzle velocity of approximately 2,230 meters per second (Mach 6.5), with plans to increase the charge energy from 5 megajoules (MJ) to a projected 20 MJ shortly.