Before revision: The torque effect experienced in helicopters and single propeller-powered aircraft is a result of Isaac Newton's basic law of motion that "for every action there is an equal and opposite reaction" In helicopters, the result of the torque effect is a tendency of the main rotor to want to turn the fuselage in the opposite direction from the rotor.
After revision: The torque effect experienced in helicopters and single propeller-powered aircraft is a result of Isaac Newton's third law of motion that "for every action there is an equal and opposite reaction" In helicopters, the result of the torque effect is a tendency of the main rotor to want to turn the fuselage in the opposite direction from the rotor.