Watch this video and hopefully it will explain it to you! :)

Understood but personally I would prefer to use a material sturdier than but all works the same so it does not matter. Good instructable.
I suggest not to use wood because it could easily be blown up and is highly flammable.
Actually, the water negates the effect of the TNT so it does not do any damage. This cannon will work with any material though :-)

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