Assemble Direction:

1, Tie thin strings or glue clothes to the interior win. (THIS IS THE MOST IMPORTANT STEP. You should use soft&heavy strings so that when there's no wind passing through the jet engine the strings or clothes can fall within the jet engine shell itself so that they are not visible from outside. You should also leave enough length for fitting as the last step.)

2, Use hot glue to ensure a strong connection between the shell and the base.

3, Use hot glue to attach the fan. NOTE THAT IT'S NOT INTENDED TO SPIN. That being said, if you have properly sized ball bearing and screw, you are more than welcome to make it spin. I modeled it as fixed as if it spins it'll spin fast and the plastic will melt without any bearing/washer.

4, Cut off the redundant length of strings or clothes to ensure a good effect. Ideally, when you blow air into it, the strings and clothes should stick out and wave like fire, and when you stop blowing air in the strings and clothes should fall down within the chamber and drags the tail into the chamber as well so that they are not visible from outside.