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Originally Posted by Eddie
Now if you use black powder as a starter, it would provide enough of both to ignite the C4, at which point, it's going to burn at 28,800+ fps...
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That's 8.7 kilometres per second kiddies, or 31,601 kph (19,636 mph).
To put if into a little more perspective, the muzzle velocity of an M60 machinegun, that is the speed the projectile is travelling as it leaves the barrel, is just 840 metres per second (3,024 kph/1,879 mph)
I think it's farily obvious just why HE isn't much good as a propellant when you look at it like that.