China has achieved a significant breakthrough in electromagnetic railgun (EMRG) technology. It has successfully demonstrated the ability to integrate guidance and control systems into a railgun projectile.
The breakthrough paves the way for precision-guided railgun projectiles capable of self-steering to distant targets. The achievement highlights China's ongoing progress in electromagnetic launch systems for potential naval and long-range strike applications.
The breakthrough could give PLAN ships a formidable anti-shipping and surface-attack capability.
Hypervelocity projectile (HVP) railguns can also be employed very effectively for air defence. Their extremely high projectile velocity can facilitate the interception of not only aerodynamic targets but also fast-moving threats such as hypersonic missiles, relying on kinetic impact rather than explosive warheads.
Railguns Explained
Conceptually, railguns are straightforward weapon systems that use electromagnetic force, instead of explosive detonation, to accelerate a conductive projectile along two parallel conductive rails to extremely high velocities, often Mach 5–7 or higher.
The use of electromagnetic force facilitates sustained acceleration of a projectile to much higher speeds than those achievable using explosives. For example, bullets fired from conventional military guns typically reach muzzle velocities of around 1–2 km/s. Railguns, in contrast, can potentially accelerate projectiles to speeds potentially exceeding 10 km/s.
The high speed of railgun projectiles considerably reduces flight time, improving accuracy. In addition, their higher kinetic energy provides greater destructive potential, obviating the need for an explosive warhead.
Railgun Development Challenges
Conceptually, the science behind railguns is straightforward. However, implementing the concept poses formidable technological challenges.
Railguns do not involve explosions, but the enormous electrical currents involved result in resistive heating, friction, arcing, and plasma formation at the projectile-rail interface, causing severe wear and tear.
The weapon requires massive electrical currents, measured in mega-amperes, to generate the intense magnetic fields needed to propel the projectile. Consequently, railguns require compact yet powerful electrical generation and storage systems.
Perhaps the most formidable challenge in developing railguns arises from the forces experienced by the projectile as it accelerates from rest to Mach 7 within the length of the barrel. Depending on barrel length, the projectile can experience accelerations ranging from 15,000 g to 65,000 g. In contrast, conventional artillery shells typically experience accelerations ranging from hundreds to a few thousand g.
Projectile Control and Guidance
The extremely high g-forces experienced by a railgun projectile would be of merely academic interest if there were no need to fit guidance equipment and electronics within the projectile. However, that is not the case.
The relatively higher accuracy of a railgun projectile, arising from its greater speed, becomes less significant as engagement range increases. The longer the desired engagement range, the greater the need for seekers and guidance systems to correct trajectory errors.
The real challenge is developing electronic and mechanical guidance components capable of surviving accelerations exceeding 20,000 g as well as the intense magnetic pulse generated during launch.
The US Navy almost shelved its naval railgun programme after failing to solve the guidance-survivability challenge. Japan has largely sidestepped the issue by focusing on a smaller-calibre railgun intended for short-range defensive applications.
US and Japanese Efforts
The US Navy began developing a railgun around 2005. The concept was first tested in October 2006 at the Dahlgren facility. In July 2017, the Navy conducted a public demonstration involving multi-shot salvos. The demonstration marked a significant step towards proving a practical rate of fire capable of delivering several rounds per minute.
The railgun tested demonstrated a range capability exceeding 100 nautical miles.
In July 2021, the programme was paused due to technical challenges involving barrel life, power generation, and rate of fire. Prototype testing resumed in 2025 at White Sands. The weapon has yet to be operationally fielded.
The United States is also developing technology that could provide guided projectiles under the Hyper Velocity Projectile (HVP) programme. HVPs have been successfully tested from existing 5-inch naval guns, including aboard USS Dewey in 2018. Guidance-system development and at-sea testing remain active.
Following initial development, the US Navy explicitly expanded the railgun's role to include air and missile defence, highlighting the potential of HVPs.
In 2022, Japan's Ministry of Defense announced its intention to develop electromagnetic guns capable of countering hypersonic missiles.
Chinese Breakthrough
It was recently reported that a Chinese prototype projectile survived a 20,000 g overload lasting eight milliseconds and exposure to a 7-tesla magnetic pulse during an actual railgun firing test. A magnetic flux density of 7 tesla is roughly 140,000 times stronger than Earth's magnetic field.
The projectile carried a delicate guidance chip housed within a protective silicon shell featuring a multilayer shielding system that included copper, iron, polyurethane dampers, and μ-metal.
The Chinese breakthrough is a landmark achievement. So far, there has been no publicly available evidence of an HVP surviving actual railgun launch stresses while retaining guidance functionality.
Notwithstanding the breakthrough, broader challenges such as rail erosion remain unresolved.
India's Quest for EMRG
In 2017, it was reported that DRDO had successfully developed an electromagnetic railgun capable of accelerating projectiles to Mach 6, or approximately 4,600 miles per hour.
DRDO stated that a 12 mm square-bore EMRG had been successfully tested and that work was underway on a 30 mm version. The objective is to accelerate a one-kilogram projectile to a velocity exceeding 2,000 m/s using a 10-megajoule capacitor bank.
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