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  • CourtneyS4 commented on Rcmaster06's instructable Awesome Tennis Ball Mortar1 month ago
    Awesome Tennis Ball Mortar

    We made these as a kid using the older sturdier pre-aluminum soda cans. After much experimentation, the common design in our area used four cans. One was left intact with the pop top removed and a small (~1/4") hole punched in the side at the bottom. The rest were hollowed out, top and bottom. Enough lip was left on the top can to only allow the tennis ball to drop inside that can. As with your design they were joined with duct tape and the joints were reinforced with electrical tape. Then we just put in a small squirt of lighter fluid in the bottom hole and a small squirt in the top; followed by a vigorous shake to distribute the liquid. Then we popped the ball in the top and touched off the hole with a match. KABOOM!!... and the tennis ball would rocket ski-ward. This design w...see more »We made these as a kid using the older sturdier pre-aluminum soda cans. After much experimentation, the common design in our area used four cans. One was left intact with the pop top removed and a small (~1/4") hole punched in the side at the bottom. The rest were hollowed out, top and bottom. Enough lip was left on the top can to only allow the tennis ball to drop inside that can. As with your design they were joined with duct tape and the joints were reinforced with electrical tape. Then we just put in a small squirt of lighter fluid in the bottom hole and a small squirt in the top; followed by a vigorous shake to distribute the liquid. Then we popped the ball in the top and touched off the hole with a match. KABOOM!!... and the tennis ball would rocket ski-ward. This design was much sturdier and we never used a blast container (PVC). Dozens were made by the kids in my town and I never heard of a mishap. Alas, this type of can is long gone... but I have heard that there are certain spray cans (like WD40 and whipped cream) that are the proper size and just as strong or stronger. Might be a better, safer alternative to the Pringles design.

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  • CourtneyS4 commented on adamf135's instructable Wooden Cube Puzzle2 months ago
    Wooden Cube Puzzle

    There is a seven piece version of this puzzle called a Soma cube, which was quite popular in the early 70's. There are multiple solutions and multiple shapes to solve. You can find several web pages devoted to it. I loved mine and have always wanted a good replacement. It could be built in exactly the same manner that you made yours. I think I'll make one using your example. Thanks!Here is Soma on Wikipedia -- https://en.wikipedia.org/wiki/Soma_cube

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