The moment weight of a rotor blade means?

• A. It accounts for both the mass weight and the center of balance
• B. It is simply the total blade mass
• C. It is the blade’s moment of inertia
• D. It measures only the blade tip weight

Answer: (A)

Moment weight describes how the blade’s weight acts about the rotor’s axis, combining how much weight there is with where that weight is located. It reflects the weight (mass) and its distance from the center of balance, i.e., weight times lever arm, so you understand the actual turning effect as the rotor spins. This is essential for accurate balancing and vibration analysis, since a blade’s weight distribution matters just as much as the total mass. It’s not just the total mass, not the moment of inertia alone, and not only the weight at the tip—what matters is weight in relation to its distance from the center of balance, which is what moment weight captures.