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Sarah Palin 18/02/07(Wed)07:06 No. 15415
15415

File 151798359540.jpg - (77.38KB , 650x488 , 153957922479f050242d9db797e46e79.jpg )

Found this in a news article about China's (alleged) new rail gun.

This is supposed to be a test firing "of a US navy electromagnetic rail gun that can fire projectiles at 8700km/h — without the aid of gunpowder"

If the cannon doesn't use any gunpowder, and the projectile is not self-propelled, where is all that fire coming from?

My first thought was this must be an ordinary cannon firing an ordinary projectile from an explosive propellant and no one bothered to do any research before publishing the article, as is standard procedure for modern news.

Then again, despite the aerodynamic design of the projectile it must create some friction against the air and the barrel, and in turn heat; the magnetic propulsion system may also generate heat on the projectile through induction. Would a projectile fired from a suffiently powerful railgun create such an explosion when exiting the barrel?


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Sarah Palin 18/02/09(Fri)06:09 No. 15416

Hypersonic projectile tend to ignite the air around them. Consider a meteor entering the earth's atmosphere.


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Sarah Palin 18/02/11(Sun)13:16 No. 15417

>>15416
Ok, so it does generate sufficent friction. My mental picture of railgun operation had left out that aspect of physics.


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H3 18/03/11(Sun)14:43 No. 15418

the air is not actually glowing in that picture

It was photographed using polarized light and the air density changes cause some of the light to not be able to get through the polarizer in front of the camera giving a false colour image

the friction through the air is sufficient to heat it up but not to the point it will start glowing you would to push to more like reentry speed to make the air glow

After all all the rockets Musk puts up have to go 17500 mph to launch a satellite but they don't glow on the way up



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