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Propellers are just like an airplane wing - in fact, they are just a wing with a twist in them. Each propeller blade is an airfoil, which is why they are tilted. When moving through the air, the air ain front will speed up and decrease in pressure, while the air behind will stay slow, thus having higher pressure. The high pressure air will push the propeller forward! Even though Bernoulli's Principle is in play, we call this propeller thrust, rather than lift because it pushes an aircraft forward.