What does 'Pitch' refer to concerning a propeller?

The term 'Pitch' in relation to a propeller refers specifically to the distance a propeller would move through a fluid in one complete revolution, assuming there is no slippage. This concept is critical in understanding how effectively a propeller converts rotational energy into forward motion.

When a propeller rotates, its blades exert a force on the water, causing the vessel to move. The pitch is essentially the theoretical distance that the propeller would advance with each rotation. For example, if a propeller has a pitch of 20 inches, it is designed to move forward 20 inches with each complete turn, assuming it operates efficiently in its medium.

Understanding pitch is important for Coxswains as it directly affects a vessel's speed and maneuverability, impacting operational performance in various conditions. Knowledge of pitch assists Coxswains in selecting the appropriate propeller for their specific missions, ensuring optimal performance of the vessel.

The other options, while related to propellers, do not accurately define what pitch is in this context. The speed at which a boat travels pertains to its velocity, the material relates to propeller construction, and the angle of the blades is fixed but does not define the pitch itself.