"A Matter of Some Gravity" is a 1996 Uncle Scrooge adventure comic written and drawn by Don Rosa, featuring sorceress Magica De Spell.
Rosa claims that he got the ideas for those comics during a mechanical engineering course in an institute of higher education, which he took before he became a professional cartoonist.
Huey, Dewey, and Louie help their uncles' using their weight, along with a fire extinguisher, to propel them towards Magica's plane.
Scrooge then uses Magica's wand to reverse the gravity of the plane itself, threatening to break an engine and make them fall out of Earth's atmosphere.
Luckily, as the spell only lasts 12 hours, Donald is now in the Money Bin, finally getting rid of the cobwebs (although he is now annoyed that he has to use a ladder to sweep the floor).