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Turbine-electric hybrid VTOL attack drone flies again

The Excalibur, a new turbine-electric hybrid propelled VTOL (vertical takeoff and landing) unmanned attack drone, has successfully completed another test flight after taking on two new onboard computers last week.

Developed by Aurora Flight Sciences Corp. for the U.S. Army Aviation Applied Technology Directorate and the Office of Naval Research, the Excalibur is another radical robo-craft concept vying to fill the military's burgeoning demand for specialized UAVs.

The demonstrator model, weighing in at 700 pounds, can hit 520 mph, making it one of the fastest drones around, according to the Aurora. The nearly autonomous flight control system allows … Read more

Hydrogen-powered UAV in the works

In what it says is a "first of its kind" initiative, the U.S. Navy plans to launch sometime this spring an unmanned aerial vehicle for a 24-hour endurance flight carrying a 5-pound payload and powered entirely by a hydrogen-powered fuel cell.

Called the Ion Tiger, the UAV can travel farther and carry heavier loads than earlier battery-powered designs, according to the Office of Naval Research. It also boasts "stealthy characteristics" such as reduced noise, low heat signature, and zero emissions (PDF).

"This will really be a demonstration for a fuel cell system in … Read more

Rail gun uses kinetic energy to deliver Mach 5 wallop

The U.S. Navy is installing an electro-magnetic laboratory rail gun at its Surface Warfare Center in Dahlgren, Va., bringing it one step closer to developing a ship-mounted version of this futuristic cannon.

The 32-megajoule weapon appears to be the largest rail gun ever built, according to defense contractor BAE Systems. A joule is what's needed to produce one watt of energy for one second.

It uses a magnetic "rail" instead of a chemical propellant like gunpowder to heave projectiles at Mach 7 for what could be up to 220 miles down range--that's 10 times farther … Read more

Navy picks companies to build T-Craft model

The U.S. Navy has selected two companies to develop a Transformable Craft capable of ferrying heavy tanks from ships at sea, through the surf, and onto beachheads around the world.

The Office of Naval Research (ONR) wants a T-Craft that does 40 knots, carries at least six tanks, and is able to survive 57-knot winds and 60-foot waves. It must also mitigate wave motion, to allow the transfer of vehicles from one ship to the other while rocking on the high seas.

To accomplish that, the companies Alion Science and Umoe-Mandal will need to develop and deploy some combination … Read more

Metal Storm reaches Navy test range

After years of development, a new class of weapon that uses computer-controlled electronic ignition instead of primers to fire projectiles may be finally taking its much coveted place in the U.S. military inventory.

Brisbane, Australia-based Metal Storm has delivered a four-barrel weapon to the Naval Surface Warfare Center for testing that uses a small electrical current instead a conventional firing pin to deliver stacked rounds at an astounding rate.

How astounding? Try 1 million rounds per minute. That's the rate, by the way, not the volume; still, there's no way you want to be anywhere near the … Read more