Propeller blade stations are measured from which reference point?

Propeller blade stations are measured from which reference point?

• A. From the blade tip
• B. From the blade root
• C. From the propeller nose
• D. From the hub centerline

Answer: (D)

Propeller blade stations are defined by radial positions along the blade with the hub centerline as the origin. Using the hub centerline ensures a consistent reference point for locating features along the blade from near the root out to the tip, regardless of blade length or hub design. In other words, you measure how far along the blade you are from the rotation axis, not from the tip, root, or any forward point on the nose. The tip or root alone wouldn’t provide a uniform baseline, and the propeller nose isn’t used for this blade geometry purpose, so the hub centerline is the standard reference.

Propeller blade stations are defined by radial positions along the blade with the hub centerline as the origin. Using the hub centerline ensures a consistent reference point for locating features along the blade from near the root out to the tip, regardless of blade length or hub design. In other words, you measure how far along the blade you are from the rotation axis, not from the tip, root, or any forward point on the nose. The tip or root alone wouldn’t provide a uniform baseline, and the propeller nose isn’t used for this blade geometry purpose, so the hub centerline is the standard reference.