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The rotor blades continuously spin until at a certain speed causing thrust to happen and the air pressure under the blades lower as said in daniel bernoullies principal when air or water moves at a certain speed the air under the blades lower allowing lift

hope this helps a little, im not positive its correct.

The above is not correct as the bernoullie effect has little to do with causing the helicopter to fly. The blades(rotors) spin at a fast enough rpm and are tilted as they spin thereby forcing air downward very fast so that this downward airstream compresses and pushes against the ambient air beneth the chopper thereby causing it to rise into the air.

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