While Mordred's hovercraft runs on manure, the saucer is advanced technology. It has a green fuel rod that has been broken. You need to get a replacement fuel rod. (To get the fuel rod, see the related question.) Setting the coordinates, you will find that none of the planets is in range. Go to the moon mentioned on Mordred's missing journal page, at X-56 Y-52.
56,52
The saucer Excalibur has crashed in the mud swamp. If you can replace its damaged green fuel rod, it can take you into space. (see related questions)
The saucer Excalibur is crashed in the mud swamp past the mill. If you fix it, you can reach the nearby Pewter Moon (X-56 Y-52), where you can build a real spaceship. (see related questions)
To fly to the Pewter Moon on Astro Knights Island, you need to build a spaceship by collecting spaceship parts found throughout the island. Once you have assembled the spaceship, you can use it to fly to the Pewter Moon by clicking on it and selecting the moon as your destination.
It goes to the mud swamp, which is the only place that you can use it.
To find the hovercraft on Astro Knights Island, you need to rescue the princess and receive the Coordinates Decoder. Once you have the decoder, you can use it to uncover the hovercraft's location on one of the planets. It's located on a frozen planet called Tundara.
in the swamp mud you need the manure the guy gives you so you enter the windmill on top then use the manure on the fly step.
The saucer Excalibur is crashed in the mud swamp to the right of the Mill.
you have to go through the vent in the dungeon and make the alien self destruct and then you click on the owl, then the fuel rod and you get it.
you dont go in
the swamp is past the wind mill in the mud
Your first trip up will be in the saucer Excalibur, crashed in the mud swamp by the mill. If you close the game while in space, or land back in Arturus, your spaceship will park on top of the castle.