One last rail gun related item. Here's a photograph of a cast aluminum (aluminium to our friends in the UK) that was struck by a seven-gram Lexan projectile moving at 23,000 feet per second. Note that the hole in the metal block is over four inches deep, and the block has been visibly deformed by the impact. Note that 23,000 feet per second is about 15,700 miles per hour, or 4.3 miles per second. Obviously this test had to be performed in a vacuum to avoid turning the Lexan projectile into a puff of incandescent gas. An example of the disk-shaped projectile is visible mounted in a wire in the hole.
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