US Navy Tests Electromagnetic Railgun From 33MJ

[Christophe]

I watched the video, we clearly see flames during the expulsion of the shell.
An idea where it comes from?

We also see, around 1:40 debris falling from the shell (probably the "propellant" part.

It is smaller than I thought (the shell, not the cannon).

[oli 80]

Hello, here is also the coil gun http://www.youtube.com/watch?v=EeRQsoqcO78

http://www.youtube.com/watch?v=5ggY_DkP ... re=channel

there are links in the infos of the videos

[oiseautempete]

This weapon uses kinetic energy projectiles, the same principle as the arrow shells used in conventional anti tank ammunition. An arrow shell has a small diameter (~ 30mm) + a high mass, no explosive charge and a very high speed (supersonic), fired with a guide shoe by an 120mm gun: on impact the kinetic energy is turns into heat and turns into a dart of several thousand °: the occupants of the tank hit are grilled net ...
For the operating principle:
http://fr.wikipedia.org/wiki/Munition_antiblindage

[Christophe]

Hello, here is also the coil gun http://www.youtube.com/watch?v=EeRQsoqcO78

http://www.youtube.com/watch?v=5ggY_DkP ... re=channel

there are links in the infos of the videos

Ah nice teen experiences! For once they are not that on Facebook ... parents are not afraid?

On the 3 version, when he says 72 Joules, I have not checked the calculations (they must be right) but he must talk about the energy stored in the condo. And this energy must not be transmitted entirely to the nail: an 22 produces roughly double and it does much more damage (but 22 is less mass so more initial speed and more penetration)

The standard Long Rifle .22 cartridge features a 2,6 gram lead ball (40 grains) propelled at about 330 meters per second in a long rifle barrel and 290 meters per second in a short gun barrel. She develops 142 joules in the mouth, ie 14 kgm.

http://fr.wikipedia.org/wiki/.22_Long_Rifle

[dedeleco]

An idea of ​​where the flames come from

The projectile support is experiencing such a large current that it is volatilized with flames during the acceleration time on 30m at 2300m / s (mach 7x330m / s) which gives an acceleration of 8800g which with huge current and acceleration , progressively volatilizes the driver during the acceleration of 26ms.
A projectile from 1Kg requests 500 000A in 26ms.
http://en.wikipedia.org/wiki/Railgun

and less violent:
http://www.youtube.com/watch?v=RKyGDWeb ... ature=fvwp

[oli 80]

An idea of ​​where the flames come from

The projectile support is experiencing such a large current that it is volatilized with flames during the acceleration time on 30m at 2300m / s (mach 7x330m / s) which gives an acceleration of 8800g which with huge current and acceleration , progressively volatilizes the driver during the acceleration of 26ms.
A projectile from 1Kg requests 500 000A in 26ms.
http://en.wikipedia.org/wiki/Railgun

and less violent:
http://www.youtube.com/watch?v=RKyGDWeb ... ature=fvwp

Good evening, look, but it's a padawan video

[Christophe]

Now they play the Star Wars (with lasers), with a little video: http://www.bbc.co.uk/news/technology-13033437

A high-energy laser (HEL) fired from a US warship off the California coast has ignited a nearby boat. Video courtesy of the US Office of Naval Research.

The US Navy fired a laser gun from one of its ships for the first time.

Researchers used the high-energy laser (HEL) to disable a boat by setting fire to its engines off the coast of California.

Similar systems had previously been tested on land, but moist sea air presented an extra challenge as it reduces beam power.

The navy said that ship-borne lasers could eventually be used to protect vessels from small attack boats.

The US military has been experimenting with laser weapons since the 1970s.

Early systems used large, chemical-based lasers which are provided to produce dangerous waste gases.

More recently, scientists have developed solid state lasers that combines large numbers of compact beam generators, similar to LEDs.

HELs fire

Until now, much of the development of HELS has focused on shooting down missiles or hitting land-based targets.

Peter Morrison from the Office of Naval Research.

"This test provides an important data point as we move toward putting directed energy on warships.

"There is still much work to do to make sure it's done safely and efficiently," he said.

While a weaponised system would have been expressed in a laser,

A gun that uses visible laser light to block out pirates was announced by BAE Systems in 2010.

The technology is still being tested, ahead of a commercial launch.