OT Water Bottle Cannon

http://www.bbc.co.uk/news/uk-wales-south-east-wales-15766483
It's interesting to see how the wall collapses and that the blocks aren't pulverized like a typical projectile would do.
R
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wrote:

If the cells were dowelled and grouted like you do in tornado shelters (FEMA 320 standard), it would just get wet.
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