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  1. F

    A Bowling Ball Cannon! God This Looks Like Fun

    The inside of the air cylinders have a large seam where they were welded. This makes "patching" unpractical, it would also require a very thick patch. We didn't use any wadding over the powder either. I've seen people use patches with small cannons (1" to 2" bore) with round lead cannon...
  2. F

    A Bowling Ball Cannon! God This Looks Like Fun

    True enough. The air cylinders are welded tubes with long unknown histories. I have heard of several people using them without a failure, but we all hid behind an earth embankment when setting ours off.
  3. F

    A Bowling Ball Cannon! God This Looks Like Fun

    That's my page. I don't have any mpegs. The bowling ball is a sloppy fit in a gas cylinder, there was at least a quater inch of clearance, but if you use enough powder it doesn't matter. We were launching close to straight up (maybe 75 degrees elevation). With a light powder charge it...
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