Unlike many Army helicopters, what type of rotor system does the UH-72 have?

• A. Fully articulated
• B. Belt-driven
• C. Rigid
• D. Dual rotor

Answer: (C)

The UH-72 helicopter is equipped with a rigid rotor system, which distinguishes it from the fully articulated systems commonly found in many Army helicopters. In a rigid rotor system, the blades are attached directly to the rotor hub without any hinges, allowing for less complexity and weight. This design offers several advantages, such as improved aerodynamic efficiency and reduced maintenance requirements, as fewer moving parts are involved compared to articulated systems. The rigidity of the rotor blades allows them to flap and lead-lag primarily through bending, which can lead to advantageous performance characteristics, especially in terms of stability and control during flight.

Other rotor systems, like the fully articulated system mentioned, have multiple hinges that allow for more freedom of movement, which can provide enhanced maneuverability but also increases the mechanical complexity and potential for maintenance issues. The rigid system used in the UH-72 reflects a design choice focused on reliability and efficiency, aligning with the helicopter's role in various operational environments.