Frisbee rims stabilize flight via gyroscopic force
A plastic disc has no aerodynamic business flying gracefully through the air. The only reason a frisbee doesn't immediately flip over and crash is due to the thickened outer rim, which shifts the mass to the edges. When you throw it with spin, this localized mass creates powerful angular momentum, turning a cheap piece of molded plastic into a highly stable gyroscope that perfectly defies gravity.

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