Our group has built a vey sturdy cannon. We are expecting good results. We have minimized the amount of holes and gaps in the main projector to have the least amount of gas released and overall a high pressure build up. We've angled the cannon at approximately 45 degrees so that it shoots its best possible. Problems could be that the main hole where we will put the ball could be too large, thus letting gas escape, but other than that it is very sturdy.
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