What material are the rotor blades of the TH-73 primarily made from?

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The rotor blades of the TH-73 are primarily made from composite materials. This choice is significant because composite materials, which often consist of a combination of fiberglass, carbon fiber, and resin, offer a combination of strength, lightweight properties, and durability that is essential for helicopter rotor blades. These materials contribute to enhanced performance characteristics, such as improved aerodynamics and resistance to environmental factors, which are crucial for the safety and efficiency of the aircraft.

In contrast, other materials like aluminum, wood, or steel do not provide the same balance of lightweight properties and environmental resilience as composites. While aluminum and steel have their strengths, they are generally heavier, which can adversely affect the helicopter's performance and fuel efficiency. Wood, while historically used in aviation, is less common in modern designs due to its susceptibility to moisture and decay, making composite materials the preferred choice in the design of contemporary rotor blades like those on the TH-73.