Cannons

Cannons
Cannons are the most basic type of weapon in the game. They fire shells in a arc to their target, and lead their target. They are the most numerous of all the weapons. Cannons fire a white projectile that takes the form of a semi-transparent tube, leaving a trail of increasingly transparent tubes. They have a fairly slow travel time, and thus the turret needs to lead its shot. The leading of shots can allow smaller ships to dodge the shells while they are in flight at longer ranges.

Railguns
Railguns are a type of cannon that behaves differently from the standard cannon. They fire either a blue or red pellet (Medium Railgun and Heavy Railgun respectively), that travels at a low altitude at the same speed as normal cannons. This lower arc gives the railgun greater accuracy, which can allow it to be used as a "Sniper" of some sorts.The lower arc also allows it to hit even moving PTs at longer range then normal cannons. (This is still unadvisable)

Cannons:
Cannons take up all three sizes, Small, Medium, and Heavy.