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When I watch that video on YouTube, it shows you how to make a rapid fire tnt cannon. I made it, but when I activate it, it just explodes and the water flow out! I did that in survival mode, so I lost all the stuff to build that cannon because it exploded. Heres the video: Rapid Fire TNT Cannon

Heres some pictures:

The Cannon I Made (front)

The Cannon I Made (back)

enter image description here

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    Have you tried building it in Creative mode to perfect it first? It's easier to figure out flaws when you can quickly rebuild. – SevenSidedDie Oct 22 '13 at 20:10
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    I'm not sure we can properly answer this without a look at your reproduction of the cannon in that video. As the one in the video seems to (largely) work, the only conclusions I can come to is that either you copied the design (or the method for activating it) poorly, or an update to Minecraft since March made some part of that design not work. – Trent Hawkins Oct 22 '13 at 20:36
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    @MinecraftGamer upload some pics of your cannon – Qwertie Oct 22 '13 at 20:40
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    You could always try the Print Screen key, and then paste into MSpaint. – Trent Hawkins Oct 22 '13 at 21:04
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    @MinecraftGamer are you playing PC, Pocket or X-Box 360 Minecraft – Memor-X Oct 22 '13 at 22:03
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I just re-watched the video, and compared it to what you are showing us here. I think I may have figured it out.

The video instructs you to place the final 3 bits of redstone on the second set of dispensers while the clock is running. This creates a delay between the explosion of the projectile TNT, and the propellant TNT. If you already have redstone on top of the second set of dispensers when the clock starts, the projectile TNT will be dispensed at the same time as the propellant TNT, and go off at the same time as your propellant. That little delay is critical to ensure that your cannon doesn't blow up in place, and that your projectile will actually move forward.

  • wait, so you destroy the redstone on the top three dispensers? And then you put the redstone on the ground? And then you quickly place the three redstone on the top set of dispensers? Is that correct? I think it is. I tried it now and it looks really cool. – Minecraft Gamer Oct 25 '13 at 0:28
  • @MinecraftGamer That is correct. – Unionhawk Oct 25 '13 at 0:29
  • I put the three redstone on the set of dispensers on top the first time because I want to make it easier. Then I just put the redstone on the ground the first time. So that was why it exploded. I want to make it easier because my computer sometimes lags. – Minecraft Gamer Oct 25 '13 at 0:31

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