Centurion

For decades, warships have carried mortar and rocket launched decoys to spoof anti-ship missiles. Some launch chaff (thin strips of highly radar reflective metalicized mylar) and some carry flares to defeat infra-red seekers. Usually these launchers are tied into a ship’s electronic warfare receivers. They’re also usually fixed tubes scattered about the ship.

Chemring has devised a trainable decoy launcher for use on Royal Navy ships, to better position any decoys based on the incoming vector of any particular threat. The really interesting thing about their Centurion launcher however, is that they’ve adapted it to fire a variety of munitions, including guided missiles, what appears to be the Javelin anti-tank missile, as a counter-swarm weapon.

[youtube=http://www.youtube.com/watch?v=ykjenzngX3s&w=448&h=252&hd=1]

With an effective range of about 2500 meters, the Javelin isn’t the best possible weapon. But it does have some things going for it. First, it’s a tried and true weapon with a very good service record. Second, it’s fairly cheap. Third, and perhaps most importantly, it’s a “fire and forget” weapon, that requires no further guidance from the launching ship after it’s left the tube. That means the ship can quickly cycle to the next target. And the key to defeating a swarm attack is rate of fire. You have to be able to service all targets in the time it takes the enemy to transit between your maximum range, and his maximum range.

Given that as of today, the LCS sails with no effective anti-swarm missile (well, a very limited number of RAM missiles are aboard), at this point, I’d be happy to see half a dozen Gunner’s Mates on the aft helo deck shooting the land-based version of Javelin. 

Ideally, we’d see a missile with a bigger warhead and a better range. But better something than nothing.

Via: Wired

Dragon Tales

One of the jobs I had when I was a young troop was Dragon Gunner. By the time I was a Dragon Gunner, they were pretty long in the tooth and not very highly thought of. But think about this: back before you could buy a pocket calculator, the Army had fielded a guided missile that could reach out and destroy a tank over half a mile away, and yet was small enough and light enough for one man to carry.

The Dragon, or M47 Medium Anti-Armor/Assualt Weapon, was first issued in 1975. It was a man portable guided missile that used wire guidance technology called SACLOS-Semi-Automatic Command Line of Sight. Basically, when the missile was launched, it trailed to very thin coppper wires behind it. It also had a flare in the rear of the missile. The sight unit tracked the flare and saw if the flare was in the crosshairs or not. If the missile was not in the cross hairs, the sight sent a signal by way of the wires for the missile to go up, down, left, or right. All you had to do to guide the missile was keep the crosshairs on the target. But that is easier said than done. Dragon gunners spent a lot of time practicing this skill. Since the missile cost about $10,000, they didn’t let us shoot all that many for practice. Usually, a device that fired a powerful blank cartridge was used. One of the other things that made it tough to aim was the launch itself. The missile used a small rocket to propel itself out of the launch tube.

[youtube=http://youtube.com/watch?v=xu7HjKR4I3U]

That’s a missile being shot from a test stand. In real life, it looks pretty much the same and it takes practicee to avoid flinching. If you flinch, you tend to point the sights at the dirt. The missile quickly obeys and flies right into the dirt. That’s not what you want.

If you look closely at the photo above, you’ll see a bunch of dimples on the side of the missile. These are the rocket motors that fly it to the target. Since the back end of the missile is taken up by the wire spool, the flare and the starter motor, the engineers had to put the sustainer motors somewhere else. Also, they had to figure out a way to control the missile in flight. They came up with an unusual method. There are 32 pairs of motors on the missile. While the Dragon is flying, it is spinning like a bullet. Pairs of motors will fire, sounding like a “pop” to boost it on its way. If the missile is not in the crosshairs, other pairs of motors will fire to push it back onto the right path.

Here’s a video that demonstrates the launch and if you listen closely, you’ll hear the pop-pop-pop.

While the Dragon was a pretty impressive weapon for its day, it had its problems. Its range was only 1000 meters. That’s right about the maximum range of the machine guns mounted on all the vehicles it was shooting at. Since it took 10 seconds  for the missile to fly that far, the bad guys had a fair chance of spotting you and shooting quite a few bullets at you while you tried to guide the missile. They didn’t even have to hit you. If they made you flinch, you’d miss the target. That was the other big problem. You had to keep the crosshairs on an often moving target. Even heavy breathing was enough to make this difficult. Getting shot at didn’t help. Still, it was better than no anti-tank weapon at all.

With these shortcomings in mind, the Army developed the replacement for the Dragon. The Javelin has twice the range, is faster, has a better warhead, and has a fire and forget capability. Once the Javelin gunner fires, he can duck for cover or start reloading while the missile guides itself to the target.

[youtube=http://www.youtube.com/watch?v=8VdRnY-TUb4]