Japanese Electromagnetic Cannon Shoots at 7 Times the Speed of Sound

Written by Fabio Lucas Carvalho

Published on 11/09/2025 at 23:26

Updated on 11/09/2025 at 23:27

Japão testa canhão eletromagnético de 20 megajoules a bordo do navio JS Asuka, atingindo Mach 7 e avançando no desenvolvimento de armas de energia direcionada.

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Experimental Firing of Japanese Electromagnetic Cannon Reaches Mach 7 and Marks Advance in Energy Weapons for Maritime Defense.

Official images of the electromagnetic cannon mounted on a ship were released by Japan, with firing conducted from the test ship JS Asuka on September 10.

The record was presented as a milestone in national efforts for directed energy weapons intended for the Japan Self-Defense Forces.

The Acquisition, Technology and Logistics Agency (ATLA), linked to the Ministry of Defense, reported that the test of the electromagnetic cannon onboard took place from June to early July, with support from the Maritime Self-Defense Force. This was the first demonstration of the system in action installed on an actual ship.

ARTICLE CONTINUES BELOW

Institutional Structure and Industry

The Fleet Research and Development Command operates the Asuka as a technological demonstrator. ATLA oversees the program with industrial support from Japan Steel Works, a manufacturer of naval weapons. The electromagnetic cannon project was formally launched in 2016, with live-fire testing starting in 2022.

Initial research prioritized two obstacles: stabilization of projectiles at hypersonic speeds and mitigation of barrel wear under extreme stresses. These fronts were defined as critical factors for the maturity of the electromagnetic cannon.

External and Comparative Learnings

The U.S. Navy terminated its publicly recognized electromagnetic cannon project in 2021, after spending over US$ 500 million. According to Defense News, severe barrel degradation was recorded with fewer than 30 shots, redirecting emphasis to solid-state lasers.

Field reports indicated inconsistent performance and limited operational readiness of laser systems. The Japanese development aims to overcome these limitations through the electromagnetic cannon.

Technical Parameters and Performance

The prototype of the electromagnetic cannon on the Asuka is said to weigh approximately eight metric tons (nine US tons) and have a six-meter barrel. Open-source analysis cited by Shephard Media indicates 40-millimeter steel projectiles weighing around 320 grams (0.7 pounds).

In previous tests, the initial speed reached about 2,230 meters per second, corresponding to Mach 6.5. The stated plan aims to raise the energy load from 5 megajoules to 20 megajoules, a level associated with firing at Mach 7.

Ammunition, Effect, and Employment Cost

Unlike explosive ammunition, the electromagnetic cannon employs pure kinetic energy through inert projectiles at hypersonic speeds. This architecture has been pointed out as a cost-effective alternative for specific functions when compared to guided missiles.

Conceptual diagrams suggest multi-mission configurations, including anti-air fragmentation. The ability to store a larger quantity of ammunition and the potentially lower cost per shot have been indicated as impactful factors in logistics and sustainment.

Conditions of Use and Integration in Air Defense

Atmospheric attenuation and line-of-sight limitations affecting lasers do not apply in the same way to the electromagnetic cannon, enabling its use in any weather conditions and engaging beyond the horizon in the maritime environment.

Integration of the electromagnetic cannon with long-range interceptors is being studied to form layered air defense against hypersonic glide vehicles and swarms of drones. Conflicts in the Red Sea illustrated the economic challenges of missile-based defenses against low-cost threats.

Program Status and Outlook

ATLA reported that from June to early July, a Firing Test with Electric Cannon Aboard Ships took place with support from the Maritime Self-Defense Force.

This was indicated as the first occasion when an electric cannon mounted on a ship was successfully fired at an actual ship.

The 20 megajoule electromagnetic cannon was qualified as a significant advancement in the area of energy weaponry, historically marked by unfulfilled promises. The assessment presented supports that readiness for real use is closer in the current stage of the program.

Japanese Electromagnetic Cannon Shoots at 7 Times the Speed of Sound

Experimental Firing of Japanese Electromagnetic Cannon Reaches Mach 7 and Marks Advance in Energy Weapons for Maritime Defense.

Institutional Structure and Industry

External and Comparative Learnings

Technical Parameters and Performance

Ammunition, Effect, and Employment Cost

Conditions of Use and Integration in Air Defense

Program Status and Outlook

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Japanese Electromagnetic Cannon Shoots at 7 Times the Speed of Sound

Experimental Firing of Japanese Electromagnetic Cannon Reaches Mach 7 and Marks Advance in Energy Weapons for Maritime Defense.

Institutional Structure and Industry

External and Comparative Learnings

Technical Parameters and Performance

Ammunition, Effect, and Employment Cost

Conditions of Use and Integration in Air Defense

Program Status and Outlook

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Egypt wants to draw 10 million cubic meters of water from the Nile per day into the desert, irrigate a new agricultural frontier, and build a city where there is currently only sand.

Norway is drilling 27 kilometers of rock 392 meters below the bottom of a fjord to build the world’s largest and deepest underwater road tunnel — when completed, a 21-hour journey will be reduced to 10.

Chinese engineers begin filling a 217-meter dam at an altitude of 3,000 meters and prepare a 2,240 MW hydroelectric power plant to integrate hydropower, solar, and wind energy in the upper Jinsha.

A German architect built a cylindrical house in 1994 that rotates to follow the sun throughout the day, generates 5 times more energy than it consumes, and was the world’s first energy-positive house.

An astronaut spent 340 days in space while his twin brother stayed on Earth, and NASA found a “rejuvenating” effect, genes, microbiome, cognition, and immune system that revealed the biological cost of living outside the planet.

A single solar storm can knock out satellites, wipe out GPS, and leave 40 million people without power for months — and the transformers that protect the grid take 4 years to manufacture.

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