I was a bit tired of the old 1970's tiny teal ballistic pendulum that I had. It works OK, but it's not terribly dramatic and it's quite small.
Image: chinalabsupplies.com
Instead, I took a mailing tube from a cart track, filled it with a pocket of heavy fabric that I clipped around the edges, and mounted it on four strings in front of an air rocket launcher. It took a couple of hours to do, including figuring out that I needed to mount it from the ceiling rack instead of a smaller setup that I originally had.
It will easily take the Super cap, and it's quite dramatic. As I built it, the mass was roughly 12 times the rocket's mass, making for a pretty good ballistic pendulum. Video
here!
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