US Navy ready to deploy 'doomsday weapons'

2014-02-18 07:36

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Bath - Some of the US Navy's futuristic weapons sound like something out of Star Wars, with lasers designed to shoot down aerial drones and electric guns that fire projectiles at hypersonic speeds.

That future is now.

The Navy plans to deploy its first laser on a ship later this year, and it intends to test an electromagnetic rail gun prototype aboard a vessel within two years.

For the Navy, it's not so much about the whiz-bang technology as it is about the economics of such armaments. Both cost pennies on the dollar compared with missiles and smart bombs, and the weapons can be fired continuously, unlike missiles and bombs, which eventually run out.

"It fundamentally changes the way we fight," said Captain Mike Ziv, programme manager for directed energy and electric weapon systems for the Naval Sea Systems Command.

Shortcomings

The Navy's laser technology has evolved to the point that a prototype to be deployed aboard the USS Ponce this year can be operated by a single sailor, he said.

The solid-state Laser Weapon System is designed to target what the Navy describes as "asymmetrical threats". Those include aerial drones, speed boats and swarm boats, all potential threats to warships in the Persian Gulf, where the Ponce, a floating staging base, is set to be deployed.

Rail guns, which have been tested on land in Virginia, fire a projectile at six or seven times the speed of sound - enough velocity to cause severe damage. The Navy sees them as replacing or supplementing old-school guns, firing lethal projectiles from long distances.

But both systems have shortcomings.

Lasers tend to lose their effectiveness if it's raining, if it's dusty, or if there's turbulence in the atmosphere, and the rail gun requires vast amount of electricity to launch the projectile, said Loren Thompson, defence analyst at the Lexington Institute.

"The Navy says it's found ways to deal with use of lasers in bad weather, but there's little doubt that the range of the weapon would be reduced by clouds, dust or precipitation," he said.

Producing enough energy for a rail gun is another problem.

The Navy's new destroyer, the Zumwalt, under construction at Bath Iron Works in Maine, is the only ship with enough electric power to run a rail gun.

The stealthy ship's gas turbine-powered generators can produce up to 78MW of power. That's enough electricity for a medium-size city - and more than enough for a rail gun.

Technology from the three ships in that DDG-1000 series will likely trickle down into future warships, said Capt James Downey, the programme manager.

Engineers are also working on a battery system to store enough energy to allow a rail gun to be operated on warships currently in the fleet.

Both weapon systems are prized because they serve to "get ahead of the cost curve", Ziv said.

In other words, they're cheap.
- AP
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