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Thrust is the total lift developed by the blades of a rotor or propeller, measured perpendicular to the rotor.

In an airplane, a propeller develops thrust, pushing the aircraft forward through the air so that the wings can develop lift to counter gravity.

In a helicopter, the main rotor develops thrust to counter gravity and, when inclined from the horizontal, also provides thrust to accelerate the aircraft forwards. The tail rotor develops thrust to counter the torque reaction of the main rotor.

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