it is actually the "rocket" and you need the manure to power it when you power it it will fly out and will be in the swamp
you get the manure from the boy right by the girl on ASTRO KNIGHTS ISLAND
Go to the the top and get the hover craft
To obtain manure for the hovercraft fuel in Poptropica's Astro-Knights Island, go to the farm on the main planet and explore the barn. You will find an item called "Excrement" there which can be used for the hovercraft fuel.
put the manure that i dude gives you in it.
power it with the manure
in the top of the windmill
The saucer Excalibur, one of the attacking craft, has crashed in the mud swamp to the right of the Mill.
you go to the guy with a brown hood then click him hel give you manuwer then jump on the wind mill then go left when the top will opin then go in click it it will fly out get on it there you go see ya
Go to the top of the mill and spin the wings counter clockwise and go in. You will see a hover craft and the fuel is the kids munuer
on the left of the ye old mill theres a gut holding a shovel talk to him and he will give you manure then go to the hover craft and click use on the manure and that's how you turn it on
the hover craft in poptropica is in the top of the mill to open it jump on the spikes
use the fuel rod