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flying saucer
The big fan is a "windmill", an archaic way to harness wind (or water) power to grind grain. To get the saucer working, you need a green fuel rod. (see related question)
by ship
by land
A "RORO" or "Roll on, roll off" ship is a ship that has loading ramps into the ship and around it, allowing trucks to drive on to the ship when loading, and drive off the ship when unloading. This eliminates the need for large cranes to lift the trucks and trailers into the hold of the ship and back out again.
Grain s transported by 1 ship called the jherem.
Cargo ship
The likely word is wharf (a ship loading dock).
Farmers could ship their grain by boat to markets in St. Louis.
The only rocket ship in Arturus is the crashed saucer Excalibur, in the mud swamp to the right of the Mill. You have to find a replacement fuel rod for the saucer, which can get you into space. The robot invader who is locked in the dungeon is powered by the same kind of rod. (see related question)
It is a corruption of loading board.
You must enter the Astrozone building and swap your saucer for a new ship, which you build on the Holopad.