Below are all the cannon types for movecraft.

Types:
Battleship
classic
Cruiser
Destroyer
ironCannon
motar
sentry
Yamato

Space Types:
OrbitalRailgun (fires diamond block & nether star : 3x 30 diamond block, 1x 29 diamond block. 1x 28 emerald)
RailgunMk.1 (fires diamond block : 11 emerald long)
RailgunMk.2 (fires diamond block : 16 emerald long)
SpaceBattleship (fires emerald)
SpaceCruiser (fires emerald)
SpaceDestroyer (fires emerald)
SpaceYamato (fires emerald)

Here is what they look like and what each fires.

EDIT: Space cannons are now iron bars instead of end rods.

space2_1538524338.png space_1538524345.png