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How is it possible for an rc helicopter to fly upside down?

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How is it possible for an rc helicopter to fly upside down?

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If you’ve ever watched a serious RC helicopter pilot, you’ve probably seen him fly his machine upside down. It’s odd and disorienting and something you’d certainly never see a rescue copter pilot attempt. But it’s also not hard to do.Fixed PitchThere are two types of model helicopters: fixed pitch (FP) and collective pitch (CP). A fixed pitch helicopter has blades similar to an airplane’s propeller or to ceiling fan blades. They remain at a set angle and so always push air toward the bottom of the aircraft, regardless of the copter’s orientation. A helicopter with fixed blades would quickly become a very large post hole digger if it were to attempt inverted flight.Collective PitchA collective pitch rotor can change its angle, and thus can push air toward the bottom of the aircraft with varying force at the same RPMs and can even push air off the top of the aircraft, thus allowing for inverted flight.Airfoil ShapeAdditionally a stunt, or “3-D” model helicopter has an airfoil that is sym

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