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If an aircraft does not have a piston engine, how does it start moving down the runaway before taking off?
Piston engines are commonly used to give power to a propeller. So, some modern aircrafts with propellers do have piston engines. But, most modern aircrafts use turbofan engines instead. Engines generate thrust, the force of flight that pushes an aircraft in the direction of motion. Modern aircrafts use their engines to move forward, both on land and in air.