What different cannons exist in Minecraft?
The only distinction in between the toughness of cannons is the amount of TNT coverings they fire. A cannon which fires 2 coverings (which is actually 2 cannons) will certainly be two times as destructive as one that fires a solitary TNT.
The only various other distinctions in cannons are array and also ammunition (as some call for even more TNT as propulsion).
There is a solitary sort of cannon ; you go down lit TNT right into water, and also when it goes off it 'fires' the 'covering' that goes to the side of the water. TNT in water does not create devastation ; just the pressure of the blast is sent. Blocks are not damaged, and also damages is not used.
Within this standard synopsis there is a substantial selection in just how the cannon can be created. This is most likely what your close friend is describing. You can turn on loads of TNT simultaneously as the 'cost', you can release a selection of things, pets, even more TNT, etc.