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Registered Member #1875
Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635
Pics or it didn't happen! ;)
I scrolled down looking for a video as soon as I clicked the link before succumbing to actually reading the text... Still wish they'd included more specifications. Mach 5 is great, but how does the damage it causes compare to a guided explosive? And how big is the darn thing? And most importantly... where's the video?
Registered Member #1875
Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635
A 23 lb bullet at Mach 5 means implies about 15MJ of power in the bullet! That means it is pretty close to achieving 50% efficiency and has therefore been designed to maximize power transfer. Good to know they're doing their homework! ;)
Though they're going to have to incorporate capacitors into hull design if they keep scaling this thing up!
Registered Member #75
Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
Last time I checked TNT had an energy of about 4MJ/kg, so 15MJ puts this at roughly the destructive power of a shell filled with 3kg of explosives. Obviously this is intended for breaching armor in a similar way to what a shaped charge does. Since they don't convert chemical to potential energy with more than maybe 20% efficiency, it's probably closer to the effect of 15kg of explosives, which I imagine would be a pretty big shell.
Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
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Posts: 1529
I saw another, smaller (12MJ) railgun at another naval facility, and saw a couple of interesting things. The main point that struck me was that they used a steel cover over the copper rails, and had success into that. They shot into a large vacuum chamber, and the projectile regularly pierced through 6 3/4" steel targets (could have taken one if I wanted, had a giant bucket of used targets, now wish I had...). They fired roughly 6 times a day.
Registered Member #3411
Joined: Sat Nov 13 2010, 08:25PM
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Posts: 33
Hmmm, one has to wonder how often they have to rework/change the rails...
As a side wondering, I thought people are trying to make the supply compact - what happened to all those complicated looking compulsators and homopolar generators with inductive storage? Anyone know what density those huge capacitors have?
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Navy test fires 33MJ electromagnetic cannon
