Navy Sets World Record With Rail Gun

Re:Navy Sets World Record With Rail Gun by bigiain on Friday December 10, 2010 @06:55PM (#1993685)

If you take the numbers from the article as accurate, 33 megejoules at Mach 7 means the weight is ~15kg (assuming I got all my conversions and orders of magnitude right, feel free to do your own e=1/2mv^2 calculation...)

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Re:Navy Sets World Record With Rail Gun by aidenn0 on Friday December 10, 2010 @07:45PM (#1993786)

I got ~10kg from the 2500m/s number, and under 12kg from the Mach 7 number. Google agrees:

http://www.google.com/search?q=2*33megajoules/(2500+m/s)^2+i...

http://www.google.com/search?q=2*33megajoules/(7+*+speed+of+...

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Re:Navy Sets World Record With Rail Gun by borism on Saturday December 11, 2010 @07:54AM (#1994728)

Projectile speed will be much less after it has travelled 100km.

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