The crashed saucer Excalibur is in the mud swamp. To reach it, get the hovercraft from the attic of the mill. You will need to replace the fuel rod of the Excalibur, and there is another one powering the robot in the castle dungeon.
(see related questions)
The saucer Excalibur is crashed in the mud swamp to the right of the Mill.
Write down 56 52
When you get a new fuel rod, just place it in the spot on the saucer and it will lock in. (see related question)
x-56 y-52 it will get you to the moon. the moon is the only place you can go on the flying saucer
The leaky green stuff is a broken Fuel Rod that powers the saucer. You will need a new one. (see related question)
It is half-buried in the mud swamp right of the mill. (see related questions)
You must enter the Astrozone building and swap your saucer for a new ship, which you build on the Holopad.
The saucer Excalibur, one of the attacking craft, has crashed in the mud swamp to the right of the Mill.
The fuel rod powers the saucer Excalibur. The hovercraft runs on manure.
You have to find and repair the saucer that crashed past the mill. (see related questions)
You do not get or use a bucket on Astro Knights Island.
You have to get a new fuel rod for the saucer and some coordinates to fly to. (see the related questions)