This was a piece of 2.5 inch tube welded to a 5mm steel plate, angled at 45 degrees. No projectile, just 3 large teaspoons of home made gunpowder, and news paper as the wadding. Fuse was electric, set off by remote control. Note we had many safety procedures, for arming the cannon, and the electric fuse was set off by a switch actuated by a remote control servo. If you try this stuff make sure you think it through well, this expended a lot of energy that could permanently munt you up !
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