Quote:
Originally posted by Mobycat:

Put the fan on it - it has a secondary power source.

Again - try the rope example. The rope is not fluid, and it is taught - meaning it's connected to something else.
Moby, the car on ice (magic frictionless surface) Is in park with the E-brake on, and you put the big-ass fan on it, it will still move.

It doesn't matter that the rope is taut, it is an external means of propulsion, just like air. Air is connected to something else-other air. For real, if you think that an aircraft cannot move by manipulating air, then I don't know if anyone will be able to make this scenario clear to you.