EASA Module 17 Practice Questions - EASA Part-66 Module 17 - Propeller Exam

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In propeller blade element theory, the blade is analysed as a series of small aerofoil sections along its length. Why is the geometric pitch (blade angle) progressively reduced from the root to the tip?

Because the tip moves through a greater rotational distance per revolution than the root, so a smaller angle keeps the angle of attack and advance roughly constant along the blade Because the root sees a higher relative airflow velocity than the tip and must be unloaded Because centrifugal force is greatest at the tip and a small angle reduces blade stress Because the tip operates in compressible flow and a small angle prevents shock formation at all speeds

Correct Answer:

Because the tip moves through a greater rotational distance per revolution than the root, so a smaller angle keeps the angle of attack and advance roughly constant along the blade

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