What does the mast moment measure in a helicopter?

• A. The load capacity of the aircraft
• B. The bending force on the mast
• C. The lateral stability during flight
• D. The overall weight distribution

Answer: (B)

The mast moment in a helicopter refers specifically to the bending force on the mast, which is the vertical structure that supports the rotor system. This measurement is crucial because it helps determine how much load the mast can safely handle without compromising the structural integrity of the helicopter.

When the helicopter operates, dynamic forces such as lift, weight, and other loads exert pressure on the mast. Understanding the bending forces is essential for ensuring that the mast is not overloaded, which could lead to failure or significant safety issues. If the mast moment is too high, it implies that the bending forces could lead to structural damage, affecting the aircraft's performance and safety.

In the context of aviation mechanics, accurate measurement of the mast moment allows engineers and pilots to assess the stresses placed on this critical component, ensuring that the helicopter can operate safely under various conditions and loads.