Which feature is NOT a characteristic of the TH-73A main rotor?

Which feature is NOT a characteristic of the TH-73A main rotor?

• A. Four blades
• B. Fully articulated head
• C. Counter-clockwise rotation
• D. Adjustable pitch

Answer: (D)

The main rotor of the TH-73A is designed with specific features to enhance its performance and stability. Among these features, having four blades is a defining characteristic that contributes to the rotor's efficiency and lift capability. The fully articulated head allows for smooth movement and flexibility of the blades during operation, granting the helicopter improved maneuverability and handling. Counter-clockwise rotation is typical for many helicopters and is a recognized aspect of the TH-73A's rotor system, contributing to its aerodynamic performance and overall stability in flight. Adjustable pitch, however, is not a characteristic feature of the TH-73A's main rotor. While rotor systems in helicopters do allow for changes in blade pitch to control lift and response, in the context of this question, it is highlighted that the fixed-pitch characteristics of the TH-73A rotor design do not emphasize pitch adjustment in the same manner that other systems might. Understanding this helps clarify the specific engineering choices made in the TH-73A's rotor design for optimal performance in its role as a training aircraft.

The main rotor of the TH-73A is designed with specific features to enhance its performance and stability. Among these features, having four blades is a defining characteristic that contributes to the rotor's efficiency and lift capability. The fully articulated head allows for smooth movement and flexibility of the blades during operation, granting the helicopter improved maneuverability and handling.

Counter-clockwise rotation is typical for many helicopters and is a recognized aspect of the TH-73A's rotor system, contributing to its aerodynamic performance and overall stability in flight.

Adjustable pitch, however, is not a characteristic feature of the TH-73A's main rotor. While rotor systems in helicopters do allow for changes in blade pitch to control lift and response, in the context of this question, it is highlighted that the fixed-pitch characteristics of the TH-73A rotor design do not emphasize pitch adjustment in the same manner that other systems might. Understanding this helps clarify the specific engineering choices made in the TH-73A's rotor design for optimal performance in its role as a training aircraft.