While most will be content with using the conventional cannons to arm their crafts, TNT cannons can be used alongside them or in their place. Despite being more expensive and difficult to both design and operate, a well-built TNT cannon can exceed the damage the output of a conventional cannon by a considerable margin. Several mechanics on Nations increase the viability of TNT cannons on crafts.
Main page: Movecraft Signs - TNT Cannon Directors
Cannon Director signs are required to adjust the trajectory of TNT fired from your craft.
The TNT mechanics below will only apply to Primed TNT whose course is being adjusted using a Cannon Director sign.
Nations re-implements piston entity translocation, which was removed in Minecraft snapshot 16w41a, specifically for Primed TNT. This allows Primed TNT to be moved by pistons and sticky pistons.
Primed TNT will explode upon impact with a block. More specifically, Primed TNT will instantly detonate if its velocity is reduced to 1/10 of its value in the previous tick.
The explosive yield of Primed TNT that explodes on contact with block will depend on its velocity. The higher its velocity, the more powerful its explosion.