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Science & Technology
Navy Tests High-Powered Electromagnetic Railgun
2008-02-01

Amazing, it has blue-white exhaust but no smoke rings like True Lies

DAHLGREN, Va. — A futuristic weapon getting a trial run by the Navy demonstrated its destructive power at the Naval Surface Warfare Center in Dahlgren.

In the demonstration Thursday, engineers fired the electromagnetic railgun at what they said was a record power level: 10 megajoules.

The previous railgun power-use record was about 9 megajoules of muzzle energy.

ailguns use electromagnetic energy to launch projectiles long distances — more than 200 nautical miles.

Because the railgun uses electricity and not gunpowder to fire projectiles, it eliminates the possibility of explosions on ships. I would say mitigates, not eliminates

The Navy hopes the railgun will eventually replace the standard 5-inch gun on its ships. The weapon isn't expected to be deployed until at least 2020.

[A joule is defined as the energy needed to produce one watt of electricity for one second.

The railgun tested Thursday actually has a capacity of 32 megajoules, but the Navy is slowly building up the energy level in a series of tests.

That's a lot of power, but with a new series of electrically-powered ships coming on line, the Navy figures generating capacity will not be a problem.

According to the Navy, the railgun, when fully developed, will be able to launch solid projectiles at Mach 5, or about 3,700 mph.

All we need is a good energy source. I wonder how this compares to laser weapons in various ways?
Posted by:Pancho Uninemble1793

#17  CHINESE MIL FORUM > PRAVDA - USA ABSOLUTELY DEFENSELESS FROM ATTACK BY RUSSIA OR CHINA. CMF Poster - argues that China should perhaps nuke one or two cities in Mexico instead to cause Mexi massive/overwhelming refugee flood into USA.

ALso from CMF > ANALYSIS [UPI]: CHINA BEATS WEST IN AFRICA + TAIWAN LANDS ON THE SPRATLYS + CHINA'D EXPANDING NAVAL PRESENCE TROUBLES NEIGHBORS. TOPIX > CHINA CALLS FOR MORE TRADE, MILITARY COOPERATION WITH INDIA, [smaller]ASIAN STATES.
Posted by: JosephMendiola   2008-02-01 19:38  

#16  How far is Mecca from the ocean?
Just askin'
Posted by: Rambler   2008-02-01 19:22  

#15  When do we get a LEOport?
Posted by: g(r)omgoru   2008-02-01 19:20  

#14  yep, just imagine what a bigger prototype could do to a fly-ash-ridden Piece of Shit dam......

never mind
Posted by: Frank G   2008-02-01 19:15  

#13  Hang on - this is the tip of the iceberg. The real stuff the public knows nothing about...
Posted by: CB   2008-02-01 19:06  

#12  ed: I was thinking the artillery sized rail gun. Of course the naval version is a heck of a lot more in every dimension. However, again by comparison, you can imagine how enormous an old style capacitor would have to be.
Posted by: Anonymoose   2008-02-01 19:05  

#11  TOPIX/OTHER > NAVY BREAKS RAIL GUN RECORD.

US GMD/BATTLESPACE BMD > NAVY > AEGIS + RAIL GUNS + ARMED LR UAV + SUPER-PHALANX. Hybrid/Arsenal Ships? Dirigibles?
Posted by: JosephMendiola   2008-02-01 17:40  

#10  And to note.. eventually the Navy plans on deploying a 64 MJ variant that can hit targets at 200 nautical miles away. To put this in perspective the current generation of 5in guns onboard vessels achieves a muzzle energy of around 10 MJ. ERGM (Extended Range Guided Munition) and LRLAP (Long Range Land Attack Projectile) may gain between 18-33 MJ eventually. To put this further into perspective the above mentioned weapons would at their terminal phase deliver between 2 and 8 MJ on target respectively, compared to approximately 17 MJ on the target even at 200+ nautical miles for the railgun.
Posted by: Valentine   2008-02-01 17:30  

#9  I'm guessing friction from the projectile and barrel, plasma from electrical arcing, and Mach 7.5 air friction ablation of the projectile.
Posted by: ed   2008-02-01 16:44  

#8  Why all the smoke?
Posted by: Nimble Spemble   2008-02-01 16:09  

#7  That would be a fairly large suitcase.
Posted by: Excalibur   2008-02-01 16:04  

#6  reduced to the size of a large suitcase.

More car sized. Try about 3000 pounds just for the capacitors.
Posted by: ed   2008-02-01 15:09  

#5  A better picture.
Posted by: ed   2008-02-01 14:57  

#4  if I were an enemy tanker, and my hull shattered, that would get my attention. At least til the shock wave made me into a pink cloud
Posted by: Frank G   2008-02-01 14:23  

#3  The background story to military railguns is also very interesting.

Several technical breakthroughs suddenly made it possible. For example, the capacitor needed to store the energy, just a few years ago, would have had to have been so large that you needed a railroad flatcar to carry it. But it has been reduced to the size of a large suitcase.

More problematic is the inductor, producing a magnetic field so powerful that unshielded, it might make the hull of the ship "meet in the middle", which is not recommended in the tech manual.

Then all that energy flows into a thin conductive diaphragm, like a drumhead, behind the projectile. This vaporizes it and turn it into a "conductive plasma".

The projectile itself is usually an advanced ceramic, which in some railguns is cylindrical with blunt ends, aerodynamics being completely different at 7km/sec or so.

When the field artillery version hit a target tank, at such speed, the *surface tension* of steel comes into play. The hull of the tank acts like it was made of ice or glass, hit by a bullet and shattering.
Posted by: Anonymoose   2008-02-01 12:34  

#2  Do the Israelis make cars? Maybe we can lend this thing to then to shoot Jew Buicks into Gaza...
Posted by: tu3031   2008-02-01 12:32  

#1  ...Take THAT , 12th century Jihadi scum. We're getting ready to kill you with weapons your faith refuses to even admit can exist.

Mike
Posted by: Mike Kozlowski   2008-02-01 12:30  

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