How does a propeller generate thrust?

A propeller generates thrust primarily through the process of converting rotational motion into aerodynamic force. As the propeller blades rotate, they move through the air and change the pressure distribution around them. This movement creates a difference in pressure between the upper and lower surfaces of the blades, resulting in lift. In the context of a propeller, this lift acts in the forward direction, producing thrust that propels the aircraft forward.

The design of the propeller blades is crucial for this process. They are shaped (airfoil) so that the air moves more quickly over the top surface than the bottom surface, creating the necessary pressure differential. The angle of attack of the blades also plays a role; by adjusting this angle can optimize the thrust production for various flight conditions.

The other options address different aspects of aircraft operation but do not explain the fundamental mechanism of thrust generation by a propeller. For instance, burning fuel in the engine predominantly relates to power generation rather than thrust creation itself. Similarly, altering weight distribution and increasing altitude are secondary effects that can influence performance but are not primary means by which thrust is produced. Understanding this fundamental principle of thrust generation is vital for comprehending larger aerodynamic concepts related to flight mechanics.