The U.S. Navy is planning sea trials for a weapon that can fire a low-cost, 23-pound (10-kg) projectile at seven times the speed of sound using electromagnetic energy, a "Star Wars" technology that will make enemies think twice, the Navy's research chief said.

Rear Adm. Matthew Klunder, the chief of Naval Research, told a round table group recently that the futuristic electromagnetic rail gun had already undergone extensive testing on land and would be mounted on the USNS Millinocket, a high-speed vessel, for sea trials beginning in 2016.

"It's now reality and it's not science fiction. It's actually real. You can look at it. It's firing," said Klunder, who planned to discuss progress on the system later on Monday with military and industry leaders at a major maritime event — the Sea-Air-Space Exposition — near Washington.

Get breaking news and insider analysis on the rapidly changing world of media and technology right to your inbox. This site is protected by recaptcha

The Navy plans to mount a futuristic electromagnetic rail gun on the USNS Millinocket for testing at sea. Courtesy Austal / U.S. Navy

"It will help us in air defense, it will help us in cruise missile defense, it will help us in ballistic missile defense," he said. "We're also talking about a gun that's going to shoot a projectile that's about one one-hundredth of the cost of an existing missile system today."

The Navy research chief said that cost differential — $25,000 for a rail gun projectile versus $500,000 to $1.5 million for a missile — will make potential enemies think twice about the economic viability of engaging U.S. forces.

"That ... will give our adversaries a huge moment of pause to go: 'Do I even want to go engage a naval ship?'" Klunder told reporters. "You could throw anything at us, frankly, and the fact that we now can shoot a number of these rounds at a very affordable cost, it's my opinion that they don't win."

U.S. officials have voiced concerns that tight defense budgets could cause the Pentagon to lose its technological edge over China, Russia and other rivals, who have been developing antiship ballistic missile systems and integrated air defenses capable of challenging U.S. air and naval dominance.

Weapons like the electromagnetic rail gun could help U.S. forces retain their edge and give them an asymmetric advantage over rivals, making it too expensive to use missiles to attack U.S. warships because of the cheap way to defeat them.

Rail guns use electromagnetic energy known as the Lorenz Force to launch a projectile between two conductive rails. The high-power electric pulse generates a magnetic field to fire the projectile with very little recoil, officials said.

The U.S. Navy has funded two single-shot rail gun prototypes, one by privately held General Atomics and the other by BAE Systems. Klunder said he had selected BAE for the second phase of the project, which will look at developing a system capable of firing multiple shots in succession.

— Reuters