The Magnus effect is a visible phenomenon that is commonly associated with a spinning object moving through the air or some other fluid. The path of the spinning object is diverted in a manner that is not present when the object is not rotating. [source]
The Magnus effect describes commonly observed differences from the typical trajectories or paths of turning balls in sport, notably association football, table tennis, tennis, volleyball, golf, baseball, cricket, and in paintball. [source]
Finley uses the Magnus effect to fly his quirky RC plane that seems more like a push reel mower than anything able of flight.