Which term describes the length of the rotor blade from the rotation point to the tip?

Which term describes the length of the rotor blade from the rotation point to the tip?

• A. Span
• B. Tip Radius
• C. Blade Length
• D. Blade Span

Answer: (D)

The distance from the rotor hub to the blade tip is described by blade span. This term is the standard way to express how far a single blade extends from the rotation point, which is the hub, to its tip. It directly communicates the blade’s reach and is the convention used in rotorcraft geometry, design, and performance calculations. Tip radius conveys the same physical distance, but blade span is the conventional term for describing one blade’s length from hub to tip, avoiding ambiguity that could come from other uses of radius or related terms. Blade length and blade span can sometimes be confused with other dimensions (like chord length or overall blade physical length), whereas blade span unambiguously refers to how far the blade extends from the rotation axis. So, the blade span is the appropriate term for the length of a rotor blade from the rotation point to the tip.

The distance from the rotor hub to the blade tip is described by blade span. This term is the standard way to express how far a single blade extends from the rotation point, which is the hub, to its tip. It directly communicates the blade’s reach and is the convention used in rotorcraft geometry, design, and performance calculations.

Tip radius conveys the same physical distance, but blade span is the conventional term for describing one blade’s length from hub to tip, avoiding ambiguity that could come from other uses of radius or related terms. Blade length and blade span can sometimes be confused with other dimensions (like chord length or overall blade physical length), whereas blade span unambiguously refers to how far the blade extends from the rotation axis.

So, the blade span is the appropriate term for the length of a rotor blade from the rotation point to the tip.