How to Make a Fire Charge Cannon in Minecraft

This is a tutorial on how to make a working fire charge cannon in Minecraft.

Add walls and any stair to the top and bottom, and three walls between.

Add 6 redstone dust behind the walls and stairs.

Add dispensers between the stairs, above the redstone.

Add a redstone torch onto the right dispenser, and redstone dust on both.

Just in front of the dispenser, add a piston, one block down, which should be powered. Then add a block above.

Add a button on top.

Add fire charge to the dispensers and you're ready for fire!