Flywheels are a type of spaceship created by the Anatidians.
Flywheels are large, circular, golden disks equipped with an anti-gravity circuit and faster-than-light speed. Their most striking characteristic is their owner's ability to shrink them to coin-size with a snap of their fingers. Flywheels are used by Anatidians touring the universe; in 1981, Anatidian tourist O.K. Quack lost his miniaturized Flywheel among the coins in Scrooge McDuck's Money Bin (an obvious risk, in hindsight) and has been looking for it ever since.