How to make a working player cannon
~ This technique is used by many minecraft players ~

Step 1:

Place a block and leave space around the block, then put blocks around the space like this:



Step 2:

Destroy the space around the block and fill it up with water. Then put redstone on the blocks

surrounding the space like this:



Step 3:

Destroy one bit of redstone and put a block in its place. Place a button / lever on that block and place TNT

Hovering over the water. Like this:



Step 4:

Step on the wool you placed in the middle, push the button or flip the lever,

then blast off into the sky!

Like this!



~ Hope this helped! ~